diff options
Diffstat (limited to 'target/s390x/fpu_helper.c')
| -rw-r--r-- | target/s390x/fpu_helper.c | 541 |
1 files changed, 330 insertions, 211 deletions
diff --git a/target/s390x/fpu_helper.c b/target/s390x/fpu_helper.c index e921172bc4..1be68bafea 100644 --- a/target/s390x/fpu_helper.c +++ b/target/s390x/fpu_helper.c @@ -36,13 +36,21 @@ #define RET128(F) (env->retxl = F.low, F.high) -#define convert_bit(mask, from, to) \ - (to < from \ - ? (mask / (from / to)) & to \ - : (mask & from) * (to / from)) +uint8_t s390_softfloat_exc_to_ieee(unsigned int exc) +{ + uint8_t s390_exc = 0; + + s390_exc |= (exc & float_flag_invalid) ? S390_IEEE_MASK_INVALID : 0; + s390_exc |= (exc & float_flag_divbyzero) ? S390_IEEE_MASK_DIVBYZERO : 0; + s390_exc |= (exc & float_flag_overflow) ? S390_IEEE_MASK_OVERFLOW : 0; + s390_exc |= (exc & float_flag_underflow) ? S390_IEEE_MASK_UNDERFLOW : 0; + s390_exc |= (exc & float_flag_inexact) ? S390_IEEE_MASK_INEXACT : 0; + + return s390_exc; +} /* Should be called after any operation that may raise IEEE exceptions. */ -static void handle_exceptions(CPUS390XState *env, uintptr_t retaddr) +static void handle_exceptions(CPUS390XState *env, bool XxC, uintptr_t retaddr) { unsigned s390_exc, qemu_exc; @@ -53,22 +61,54 @@ static void handle_exceptions(CPUS390XState *env, uintptr_t retaddr) return; } env->fpu_status.float_exception_flags = 0; + s390_exc = s390_softfloat_exc_to_ieee(qemu_exc); + + /* + * IEEE-Underflow exception recognition exists if a tininess condition + * (underflow) exists and + * - The mask bit in the FPC is zero and the result is inexact + * - The mask bit in the FPC is one + * So tininess conditions that are not inexact don't trigger any + * underflow action in case the mask bit is not one. + */ + if (!(s390_exc & S390_IEEE_MASK_INEXACT) && + !((env->fpc >> 24) & S390_IEEE_MASK_UNDERFLOW)) { + s390_exc &= ~S390_IEEE_MASK_UNDERFLOW; + } - /* Convert softfloat exception bits to s390 exception bits. */ - s390_exc = 0; - s390_exc |= convert_bit(qemu_exc, float_flag_invalid, 0x80); - s390_exc |= convert_bit(qemu_exc, float_flag_divbyzero, 0x40); - s390_exc |= convert_bit(qemu_exc, float_flag_overflow, 0x20); - s390_exc |= convert_bit(qemu_exc, float_flag_underflow, 0x10); - s390_exc |= convert_bit(qemu_exc, float_flag_inexact, 0x08); - - /* Install the exceptions that we raised. */ - env->fpc |= s390_exc << 16; + /* + * FIXME: + * 1. Right now, all inexact conditions are inidicated as + * "truncated" (0) and never as "incremented" (1) in the DXC. + * 2. Only traps due to invalid/divbyzero are suppressing. Other traps + * are completing, meaning the target register has to be written! + * This, however will mean that we have to write the register before + * triggering the trap - impossible right now. + */ + + /* + * invalid/divbyzero cannot coexist with other conditions. + * overflow/underflow however can coexist with inexact, we have to + * handle it separatly. + */ + if (s390_exc & ~S390_IEEE_MASK_INEXACT) { + if (s390_exc & ~S390_IEEE_MASK_INEXACT & env->fpc >> 24) { + /* trap condition - inexact reported along */ + tcg_s390_data_exception(env, s390_exc, retaddr); + } + /* nontrap condition - inexact handled differently */ + env->fpc |= (s390_exc & ~S390_IEEE_MASK_INEXACT) << 16; + } - /* Send signals for enabled exceptions. */ - s390_exc &= env->fpc >> 24; - if (s390_exc) { - tcg_s390_data_exception(env, s390_exc, retaddr); + /* inexact handling */ + if (s390_exc & S390_IEEE_MASK_INEXACT && !XxC) { + /* trap condition - overflow/underflow _not_ reported along */ + if (s390_exc & S390_IEEE_MASK_INEXACT & env->fpc >> 24) { + tcg_s390_data_exception(env, s390_exc & S390_IEEE_MASK_INEXACT, + retaddr); + } + /* nontrap condition */ + env->fpc |= (s390_exc & S390_IEEE_MASK_INEXACT) << 16; } } @@ -130,11 +170,22 @@ uint32_t set_cc_nz_f128(float128 v) } } +static inline uint8_t round_from_m34(uint32_t m34) +{ + return extract32(m34, 0, 4); +} + +static inline bool xxc_from_m34(uint32_t m34) +{ + /* XxC is bit 1 of m4 */ + return extract32(m34, 4 + 3 - 1, 1); +} + /* 32-bit FP addition */ uint64_t HELPER(aeb)(CPUS390XState *env, uint64_t f1, uint64_t f2) { float32 ret = float32_add(f1, f2, &env->fpu_status); - handle_exceptions(env, GETPC()); + handle_exceptions(env, false, GETPC()); return ret; } @@ -142,7 +193,7 @@ uint64_t HELPER(aeb)(CPUS390XState *env, uint64_t f1, uint64_t f2) uint64_t HELPER(adb)(CPUS390XState *env, uint64_t f1, uint64_t f2) { float64 ret = float64_add(f1, f2, &env->fpu_status); - handle_exceptions(env, GETPC()); + handle_exceptions(env, false, GETPC()); return ret; } @@ -153,7 +204,7 @@ uint64_t HELPER(axb)(CPUS390XState *env, uint64_t ah, uint64_t al, float128 ret = float128_add(make_float128(ah, al), make_float128(bh, bl), &env->fpu_status); - handle_exceptions(env, GETPC()); + handle_exceptions(env, false, GETPC()); return RET128(ret); } @@ -161,7 +212,7 @@ uint64_t HELPER(axb)(CPUS390XState *env, uint64_t ah, uint64_t al, uint64_t HELPER(seb)(CPUS390XState *env, uint64_t f1, uint64_t f2) { float32 ret = float32_sub(f1, f2, &env->fpu_status); - handle_exceptions(env, GETPC()); + handle_exceptions(env, false, GETPC()); return ret; } @@ -169,7 +220,7 @@ uint64_t HELPER(seb)(CPUS390XState *env, uint64_t f1, uint64_t f2) uint64_t HELPER(sdb)(CPUS390XState *env, uint64_t f1, uint64_t f2) { float64 ret = float64_sub(f1, f2, &env->fpu_status); - handle_exceptions(env, GETPC()); + handle_exceptions(env, false, GETPC()); return ret; } @@ -180,7 +231,7 @@ uint64_t HELPER(sxb)(CPUS390XState *env, uint64_t ah, uint64_t al, float128 ret = float128_sub(make_float128(ah, al), make_float128(bh, bl), &env->fpu_status); - handle_exceptions(env, GETPC()); + handle_exceptions(env, false, GETPC()); return RET128(ret); } @@ -188,7 +239,7 @@ uint64_t HELPER(sxb)(CPUS390XState *env, uint64_t ah, uint64_t al, uint64_t HELPER(deb)(CPUS390XState *env, uint64_t f1, uint64_t f2) { float32 ret = float32_div(f1, f2, &env->fpu_status); - handle_exceptions(env, GETPC()); + handle_exceptions(env, false, GETPC()); return ret; } @@ -196,7 +247,7 @@ uint64_t HELPER(deb)(CPUS390XState *env, uint64_t f1, uint64_t f2) uint64_t HELPER(ddb)(CPUS390XState *env, uint64_t f1, uint64_t f2) { float64 ret = float64_div(f1, f2, &env->fpu_status); - handle_exceptions(env, GETPC()); + handle_exceptions(env, false, GETPC()); return ret; } @@ -207,7 +258,7 @@ uint64_t HELPER(dxb)(CPUS390XState *env, uint64_t ah, uint64_t al, float128 ret = float128_div(make_float128(ah, al), make_float128(bh, bl), &env->fpu_status); - handle_exceptions(env, GETPC()); + handle_exceptions(env, false, GETPC()); return RET128(ret); } @@ -215,7 +266,7 @@ uint64_t HELPER(dxb)(CPUS390XState *env, uint64_t ah, uint64_t al, uint64_t HELPER(meeb)(CPUS390XState *env, uint64_t f1, uint64_t f2) { float32 ret = float32_mul(f1, f2, &env->fpu_status); - handle_exceptions(env, GETPC()); + handle_exceptions(env, false, GETPC()); return ret; } @@ -223,7 +274,7 @@ uint64_t HELPER(meeb)(CPUS390XState *env, uint64_t f1, uint64_t f2) uint64_t HELPER(mdb)(CPUS390XState *env, uint64_t f1, uint64_t f2) { float64 ret = float64_mul(f1, f2, &env->fpu_status); - handle_exceptions(env, GETPC()); + handle_exceptions(env, false, GETPC()); return ret; } @@ -232,7 +283,7 @@ uint64_t HELPER(mdeb)(CPUS390XState *env, uint64_t f1, uint64_t f2) { float64 ret = float32_to_float64(f2, &env->fpu_status); ret = float64_mul(f1, ret, &env->fpu_status); - handle_exceptions(env, GETPC()); + handle_exceptions(env, false, GETPC()); return ret; } @@ -243,7 +294,7 @@ uint64_t HELPER(mxb)(CPUS390XState *env, uint64_t ah, uint64_t al, float128 ret = float128_mul(make_float128(ah, al), make_float128(bh, bl), &env->fpu_status); - handle_exceptions(env, GETPC()); + handle_exceptions(env, false, GETPC()); return RET128(ret); } @@ -253,7 +304,7 @@ uint64_t HELPER(mxdb)(CPUS390XState *env, uint64_t ah, uint64_t al, { float128 ret = float64_to_float128(f2, &env->fpu_status); ret = float128_mul(make_float128(ah, al), ret, &env->fpu_status); - handle_exceptions(env, GETPC()); + handle_exceptions(env, false, GETPC()); return RET128(ret); } @@ -261,15 +312,19 @@ uint64_t HELPER(mxdb)(CPUS390XState *env, uint64_t ah, uint64_t al, uint64_t HELPER(ldeb)(CPUS390XState *env, uint64_t f2) { float64 ret = float32_to_float64(f2, &env->fpu_status); - handle_exceptions(env, GETPC()); + handle_exceptions(env, false, GETPC()); return ret; } /* convert 128-bit float to 64-bit float */ -uint64_t HELPER(ldxb)(CPUS390XState *env, uint64_t ah, uint64_t al) +uint64_t HELPER(ldxb)(CPUS390XState *env, uint64_t ah, uint64_t al, + uint32_t m34) { + int old_mode = s390_swap_bfp_rounding_mode(env, round_from_m34(m34)); float64 ret = float128_to_float64(make_float128(ah, al), &env->fpu_status); - handle_exceptions(env, GETPC()); + + s390_restore_bfp_rounding_mode(env, old_mode); + handle_exceptions(env, xxc_from_m34(m34), GETPC()); return ret; } @@ -277,7 +332,7 @@ uint64_t HELPER(ldxb)(CPUS390XState *env, uint64_t ah, uint64_t al) uint64_t HELPER(lxdb)(CPUS390XState *env, uint64_t f2) { float128 ret = float64_to_float128(f2, &env->fpu_status); - handle_exceptions(env, GETPC()); + handle_exceptions(env, false, GETPC()); return RET128(ret); } @@ -285,23 +340,30 @@ uint64_t HELPER(lxdb)(CPUS390XState *env, uint64_t f2) uint64_t HELPER(lxeb)(CPUS390XState *env, uint64_t f2) { float128 ret = float32_to_float128(f2, &env->fpu_status); - handle_exceptions(env, GETPC()); + handle_exceptions(env, false, GETPC()); return RET128(ret); } /* convert 64-bit float to 32-bit float */ -uint64_t HELPER(ledb)(CPUS390XState *env, uint64_t f2) +uint64_t HELPER(ledb)(CPUS390XState *env, uint64_t f2, uint32_t m34) { + int old_mode = s390_swap_bfp_rounding_mode(env, round_from_m34(m34)); float32 ret = float64_to_float32(f2, &env->fpu_status); - handle_exceptions(env, GETPC()); + + s390_restore_bfp_rounding_mode(env, old_mode); + handle_exceptions(env, xxc_from_m34(m34), GETPC()); return ret; } /* convert 128-bit float to 32-bit float */ -uint64_t HELPER(lexb)(CPUS390XState *env, uint64_t ah, uint64_t al) +uint64_t HELPER(lexb)(CPUS390XState *env, uint64_t ah, uint64_t al, + uint32_t m34) { + int old_mode = s390_swap_bfp_rounding_mode(env, round_from_m34(m34)); float32 ret = float128_to_float32(make_float128(ah, al), &env->fpu_status); - handle_exceptions(env, GETPC()); + + s390_restore_bfp_rounding_mode(env, old_mode); + handle_exceptions(env, xxc_from_m34(m34), GETPC()); return ret; } @@ -309,7 +371,7 @@ uint64_t HELPER(lexb)(CPUS390XState *env, uint64_t ah, uint64_t al) uint32_t HELPER(ceb)(CPUS390XState *env, uint64_t f1, uint64_t f2) { int cmp = float32_compare_quiet(f1, f2, &env->fpu_status); - handle_exceptions(env, GETPC()); + handle_exceptions(env, false, GETPC()); return float_comp_to_cc(env, cmp); } @@ -317,7 +379,7 @@ uint32_t HELPER(ceb)(CPUS390XState *env, uint64_t f1, uint64_t f2) uint32_t HELPER(cdb)(CPUS390XState *env, uint64_t f1, uint64_t f2) { int cmp = float64_compare_quiet(f1, f2, &env->fpu_status); - handle_exceptions(env, GETPC()); + handle_exceptions(env, false, GETPC()); return float_comp_to_cc(env, cmp); } @@ -328,21 +390,28 @@ uint32_t HELPER(cxb)(CPUS390XState *env, uint64_t ah, uint64_t al, int cmp = float128_compare_quiet(make_float128(ah, al), make_float128(bh, bl), &env->fpu_status); - handle_exceptions(env, GETPC()); + handle_exceptions(env, false, GETPC()); return float_comp_to_cc(env, cmp); } -static int swap_round_mode(CPUS390XState *env, int m3) +int s390_swap_bfp_rounding_mode(CPUS390XState *env, int m3) { int ret = env->fpu_status.float_rounding_mode; + switch (m3) { case 0: /* current mode */ break; case 1: - /* biased round no nearest */ + /* round to nearest with ties away from 0 */ + set_float_rounding_mode(float_round_ties_away, &env->fpu_status); + break; + case 3: + /* round to prepare for shorter precision */ + set_float_rounding_mode(float_round_to_odd, &env->fpu_status); + break; case 4: - /* round to nearest */ + /* round to nearest with ties to even */ set_float_rounding_mode(float_round_nearest_even, &env->fpu_status); break; case 5: @@ -357,226 +426,251 @@ static int swap_round_mode(CPUS390XState *env, int m3) /* round to -inf */ set_float_rounding_mode(float_round_down, &env->fpu_status); break; + default: + g_assert_not_reached(); } return ret; } +void s390_restore_bfp_rounding_mode(CPUS390XState *env, int old_mode) +{ + set_float_rounding_mode(old_mode, &env->fpu_status); +} + /* convert 64-bit int to 32-bit float */ -uint64_t HELPER(cegb)(CPUS390XState *env, int64_t v2, uint32_t m3) +uint64_t HELPER(cegb)(CPUS390XState *env, int64_t v2, uint32_t m34) { - int hold = swap_round_mode(env, m3); + int old_mode = s390_swap_bfp_rounding_mode(env, round_from_m34(m34)); float32 ret = int64_to_float32(v2, &env->fpu_status); - set_float_rounding_mode(hold, &env->fpu_status); - handle_exceptions(env, GETPC()); + + s390_restore_bfp_rounding_mode(env, old_mode); + handle_exceptions(env, xxc_from_m34(m34), GETPC()); return ret; } /* convert 64-bit int to 64-bit float */ -uint64_t HELPER(cdgb)(CPUS390XState *env, int64_t v2, uint32_t m3) +uint64_t HELPER(cdgb)(CPUS390XState *env, int64_t v2, uint32_t m34) { - int hold = swap_round_mode(env, m3); + int old_mode = s390_swap_bfp_rounding_mode(env, round_from_m34(m34)); float64 ret = int64_to_float64(v2, &env->fpu_status); - set_float_rounding_mode(hold, &env->fpu_status); - handle_exceptions(env, GETPC()); + + s390_restore_bfp_rounding_mode(env, old_mode); + handle_exceptions(env, xxc_from_m34(m34), GETPC()); return ret; } /* convert 64-bit int to 128-bit float */ -uint64_t HELPER(cxgb)(CPUS390XState *env, int64_t v2, uint32_t m3) +uint64_t HELPER(cxgb)(CPUS390XState *env, int64_t v2, uint32_t m34) { - int hold = swap_round_mode(env, m3); + int old_mode = s390_swap_bfp_rounding_mode(env, round_from_m34(m34)); float128 ret = int64_to_float128(v2, &env->fpu_status); - set_float_rounding_mode(hold, &env->fpu_status); - handle_exceptions(env, GETPC()); + + s390_restore_bfp_rounding_mode(env, old_mode); + handle_exceptions(env, xxc_from_m34(m34), GETPC()); return RET128(ret); } /* convert 64-bit uint to 32-bit float */ -uint64_t HELPER(celgb)(CPUS390XState *env, uint64_t v2, uint32_t m3) +uint64_t HELPER(celgb)(CPUS390XState *env, uint64_t v2, uint32_t m34) { - int hold = swap_round_mode(env, m3); + int old_mode = s390_swap_bfp_rounding_mode(env, round_from_m34(m34)); float32 ret = uint64_to_float32(v2, &env->fpu_status); - set_float_rounding_mode(hold, &env->fpu_status); - handle_exceptions(env, GETPC()); + + s390_restore_bfp_rounding_mode(env, old_mode); + handle_exceptions(env, xxc_from_m34(m34), GETPC()); return ret; } /* convert 64-bit uint to 64-bit float */ -uint64_t HELPER(cdlgb)(CPUS390XState *env, uint64_t v2, uint32_t m3) +uint64_t HELPER(cdlgb)(CPUS390XState *env, uint64_t v2, uint32_t m34) { - int hold = swap_round_mode(env, m3); + int old_mode = s390_swap_bfp_rounding_mode(env, round_from_m34(m34)); float64 ret = uint64_to_float64(v2, &env->fpu_status); - set_float_rounding_mode(hold, &env->fpu_status); - handle_exceptions(env, GETPC()); + + s390_restore_bfp_rounding_mode(env, old_mode); + handle_exceptions(env, xxc_from_m34(m34), GETPC()); return ret; } /* convert 64-bit uint to 128-bit float */ -uint64_t HELPER(cxlgb)(CPUS390XState *env, uint64_t v2, uint32_t m3) +uint64_t HELPER(cxlgb)(CPUS390XState *env, uint64_t v2, uint32_t m34) { - int hold = swap_round_mode(env, m3); + int old_mode = s390_swap_bfp_rounding_mode(env, round_from_m34(m34)); float128 ret = uint64_to_float128(v2, &env->fpu_status); - set_float_rounding_mode(hold, &env->fpu_status); - handle_exceptions(env, GETPC()); + + s390_restore_bfp_rounding_mode(env, old_mode); + handle_exceptions(env, xxc_from_m34(m34), GETPC()); return RET128(ret); } /* convert 32-bit float to 64-bit int */ -uint64_t HELPER(cgeb)(CPUS390XState *env, uint64_t v2, uint32_t m3) +uint64_t HELPER(cgeb)(CPUS390XState *env, uint64_t v2, uint32_t m34) { - int hold = swap_round_mode(env, m3); + int old_mode = s390_swap_bfp_rounding_mode(env, round_from_m34(m34)); int64_t ret = float32_to_int64(v2, &env->fpu_status); - set_float_rounding_mode(hold, &env->fpu_status); - handle_exceptions(env, GETPC()); + + s390_restore_bfp_rounding_mode(env, old_mode); + handle_exceptions(env, xxc_from_m34(m34), GETPC()); return ret; } /* convert 64-bit float to 64-bit int */ -uint64_t HELPER(cgdb)(CPUS390XState *env, uint64_t v2, uint32_t m3) +uint64_t HELPER(cgdb)(CPUS390XState *env, uint64_t v2, uint32_t m34) { - int hold = swap_round_mode(env, m3); + int old_mode = s390_swap_bfp_rounding_mode(env, round_from_m34(m34)); int64_t ret = float64_to_int64(v2, &env->fpu_status); - set_float_rounding_mode(hold, &env->fpu_status); - handle_exceptions(env, GETPC()); + + s390_restore_bfp_rounding_mode(env, old_mode); + handle_exceptions(env, xxc_from_m34(m34), GETPC()); return ret; } /* convert 128-bit float to 64-bit int */ -uint64_t HELPER(cgxb)(CPUS390XState *env, uint64_t h, uint64_t l, uint32_t m3) +uint64_t HELPER(cgxb)(CPUS390XState *env, uint64_t h, uint64_t l, uint32_t m34) { - int hold = swap_round_mode(env, m3); + int old_mode = s390_swap_bfp_rounding_mode(env, round_from_m34(m34)); float128 v2 = make_float128(h, l); int64_t ret = float128_to_int64(v2, &env->fpu_status); - set_float_rounding_mode(hold, &env->fpu_status); - handle_exceptions(env, GETPC()); + + s390_restore_bfp_rounding_mode(env, old_mode); + handle_exceptions(env, xxc_from_m34(m34), GETPC()); return ret; } /* convert 32-bit float to 32-bit int */ -uint64_t HELPER(cfeb)(CPUS390XState *env, uint64_t v2, uint32_t m3) +uint64_t HELPER(cfeb)(CPUS390XState *env, uint64_t v2, uint32_t m34) { - int hold = swap_round_mode(env, m3); + int old_mode = s390_swap_bfp_rounding_mode(env, round_from_m34(m34)); int32_t ret = float32_to_int32(v2, &env->fpu_status); - set_float_rounding_mode(hold, &env->fpu_status); - handle_exceptions(env, GETPC()); + + s390_restore_bfp_rounding_mode(env, old_mode); + handle_exceptions(env, xxc_from_m34(m34), GETPC()); return ret; } /* convert 64-bit float to 32-bit int */ -uint64_t HELPER(cfdb)(CPUS390XState *env, uint64_t v2, uint32_t m3) +uint64_t HELPER(cfdb)(CPUS390XState *env, uint64_t v2, uint32_t m34) { - int hold = swap_round_mode(env, m3); + int old_mode = s390_swap_bfp_rounding_mode(env, round_from_m34(m34)); int32_t ret = float64_to_int32(v2, &env->fpu_status); - set_float_rounding_mode(hold, &env->fpu_status); - handle_exceptions(env, GETPC()); + + s390_restore_bfp_rounding_mode(env, old_mode); + handle_exceptions(env, xxc_from_m34(m34), GETPC()); return ret; } /* convert 128-bit float to 32-bit int */ -uint64_t HELPER(cfxb)(CPUS390XState *env, uint64_t h, uint64_t l, uint32_t m3) +uint64_t HELPER(cfxb)(CPUS390XState *env, uint64_t h, uint64_t l, uint32_t m34) { - int hold = swap_round_mode(env, m3); + int old_mode = s390_swap_bfp_rounding_mode(env, round_from_m34(m34)); float128 v2 = make_float128(h, l); int32_t ret = float128_to_int32(v2, &env->fpu_status); - set_float_rounding_mode(hold, &env->fpu_status); - handle_exceptions(env, GETPC()); + + s390_restore_bfp_rounding_mode(env, old_mode); + handle_exceptions(env, xxc_from_m34(m34), GETPC()); return ret; } /* convert 32-bit float to 64-bit uint */ -uint64_t HELPER(clgeb)(CPUS390XState *env, uint64_t v2, uint32_t m3) +uint64_t HELPER(clgeb)(CPUS390XState *env, uint64_t v2, uint32_t m34) { - int hold = swap_round_mode(env, m3); + int old_mode = s390_swap_bfp_rounding_mode(env, round_from_m34(m34)); uint64_t ret; + v2 = float32_to_float64(v2, &env->fpu_status); ret = float64_to_uint64(v2, &env->fpu_status); - set_float_rounding_mode(hold, &env->fpu_status); - handle_exceptions(env, GETPC()); + s390_restore_bfp_rounding_mode(env, old_mode); + handle_exceptions(env, xxc_from_m34(m34), GETPC()); return ret; } /* convert 64-bit float to 64-bit uint */ -uint64_t HELPER(clgdb)(CPUS390XState *env, uint64_t v2, uint32_t m3) +uint64_t HELPER(clgdb)(CPUS390XState *env, uint64_t v2, uint32_t m34) { - int hold = swap_round_mode(env, m3); + int old_mode = s390_swap_bfp_rounding_mode(env, round_from_m34(m34)); uint64_t ret = float64_to_uint64(v2, &env->fpu_status); - set_float_rounding_mode(hold, &env->fpu_status); - handle_exceptions(env, GETPC()); + + s390_restore_bfp_rounding_mode(env, old_mode); + handle_exceptions(env, xxc_from_m34(m34), GETPC()); return ret; } /* convert 128-bit float to 64-bit uint */ -uint64_t HELPER(clgxb)(CPUS390XState *env, uint64_t h, uint64_t l, uint32_t m3) +uint64_t HELPER(clgxb)(CPUS390XState *env, uint64_t h, uint64_t l, uint32_t m34) { - int hold = swap_round_mode(env, m3); - float128 v2 = make_float128(h, l); - /* ??? Not 100% correct. */ - uint64_t ret = float128_to_int64(v2, &env->fpu_status); - set_float_rounding_mode(hold, &env->fpu_status); - handle_exceptions(env, GETPC()); + int old_mode = s390_swap_bfp_rounding_mode(env, round_from_m34(m34)); + uint64_t ret = float128_to_uint64(make_float128(h, l), &env->fpu_status); + + s390_restore_bfp_rounding_mode(env, old_mode); + handle_exceptions(env, xxc_from_m34(m34), GETPC()); return ret; } /* convert 32-bit float to 32-bit uint */ -uint64_t HELPER(clfeb)(CPUS390XState *env, uint64_t v2, uint32_t m3) +uint64_t HELPER(clfeb)(CPUS390XState *env, uint64_t v2, uint32_t m34) { - int hold = swap_round_mode(env, m3); + int old_mode = s390_swap_bfp_rounding_mode(env, round_from_m34(m34)); uint32_t ret = float32_to_uint32(v2, &env->fpu_status); - set_float_rounding_mode(hold, &env->fpu_status); - handle_exceptions(env, GETPC()); + + s390_restore_bfp_rounding_mode(env, old_mode); + handle_exceptions(env, xxc_from_m34(m34), GETPC()); return ret; } /* convert 64-bit float to 32-bit uint */ -uint64_t HELPER(clfdb)(CPUS390XState *env, uint64_t v2, uint32_t m3) +uint64_t HELPER(clfdb)(CPUS390XState *env, uint64_t v2, uint32_t m34) { - int hold = swap_round_mode(env, m3); + int old_mode = s390_swap_bfp_rounding_mode(env, round_from_m34(m34)); uint32_t ret = float64_to_uint32(v2, &env->fpu_status); - set_float_rounding_mode(hold, &env->fpu_status); - handle_exceptions(env, GETPC()); + + s390_restore_bfp_rounding_mode(env, old_mode); + handle_exceptions(env, xxc_from_m34(m34), GETPC()); return ret; } /* convert 128-bit float to 32-bit uint */ -uint64_t HELPER(clfxb)(CPUS390XState *env, uint64_t h, uint64_t l, uint32_t m3) +uint64_t HELPER(clfxb)(CPUS390XState *env, uint64_t h, uint64_t l, uint32_t m34) { - int hold = swap_round_mode(env, m3); - float128 v2 = make_float128(h, l); - /* Not 100% correct. */ - uint32_t ret = float128_to_int64(v2, &env->fpu_status); - set_float_rounding_mode(hold, &env->fpu_status); - handle_exceptions(env, GETPC()); + int old_mode = s390_swap_bfp_rounding_mode(env, round_from_m34(m34)); + uint32_t ret = float128_to_uint32(make_float128(h, l), &env->fpu_status); + + s390_restore_bfp_rounding_mode(env, old_mode); + handle_exceptions(env, xxc_from_m34(m34), GETPC()); return ret; } /* round to integer 32-bit */ -uint64_t HELPER(fieb)(CPUS390XState *env, uint64_t f2, uint32_t m3) +uint64_t HELPER(fieb)(CPUS390XState *env, uint64_t f2, uint32_t m34) { - int hold = swap_round_mode(env, m3); + int old_mode = s390_swap_bfp_rounding_mode(env, round_from_m34(m34)); float32 ret = float32_round_to_int(f2, &env->fpu_status); - set_float_rounding_mode(hold, &env->fpu_status); - handle_exceptions(env, GETPC()); + + s390_restore_bfp_rounding_mode(env, old_mode); + handle_exceptions(env, xxc_from_m34(m34), GETPC()); return ret; } /* round to integer 64-bit */ -uint64_t HELPER(fidb)(CPUS390XState *env, uint64_t f2, uint32_t m3) +uint64_t HELPER(fidb)(CPUS390XState *env, uint64_t f2, uint32_t m34) { - int hold = swap_round_mode(env, m3); + int old_mode = s390_swap_bfp_rounding_mode(env, round_from_m34(m34)); float64 ret = float64_round_to_int(f2, &env->fpu_status); - set_float_rounding_mode(hold, &env->fpu_status); - handle_exceptions(env, GETPC()); + + s390_restore_bfp_rounding_mode(env, old_mode); + handle_exceptions(env, xxc_from_m34(m34), GETPC()); return ret; } /* round to integer 128-bit */ -uint64_t HELPER(fixb)(CPUS390XState *env, uint64_t ah, uint64_t al, uint32_t m3) +uint64_t HELPER(fixb)(CPUS390XState *env, uint64_t ah, uint64_t al, + uint32_t m34) { - int hold = swap_round_mode(env, m3); + int old_mode = s390_swap_bfp_rounding_mode(env, round_from_m34(m34)); float128 ret = float128_round_to_int(make_float128(ah, al), &env->fpu_status); - set_float_rounding_mode(hold, &env->fpu_status); - handle_exceptions(env, GETPC()); + + s390_restore_bfp_rounding_mode(env, old_mode); + handle_exceptions(env, xxc_from_m34(m34), GETPC()); return RET128(ret); } @@ -584,7 +678,7 @@ uint64_t HELPER(fixb)(CPUS390XState *env, uint64_t ah, uint64_t al, uint32_t m3) uint32_t HELPER(keb)(CPUS390XState *env, uint64_t f1, uint64_t f2) { int cmp = float32_compare(f1, f2, &env->fpu_status); - handle_exceptions(env, GETPC()); + handle_exceptions(env, false, GETPC()); return float_comp_to_cc(env, cmp); } @@ -592,7 +686,7 @@ uint32_t HELPER(keb)(CPUS390XState *env, uint64_t f1, uint64_t f2) uint32_t HELPER(kdb)(CPUS390XState *env, uint64_t f1, uint64_t f2) { int cmp = float64_compare(f1, f2, &env->fpu_status); - handle_exceptions(env, GETPC()); + handle_exceptions(env, false, GETPC()); return float_comp_to_cc(env, cmp); } @@ -603,7 +697,7 @@ uint32_t HELPER(kxb)(CPUS390XState *env, uint64_t ah, uint64_t al, int cmp = float128_compare(make_float128(ah, al), make_float128(bh, bl), &env->fpu_status); - handle_exceptions(env, GETPC()); + handle_exceptions(env, false, GETPC()); return float_comp_to_cc(env, cmp); } @@ -612,7 +706,7 @@ uint64_t HELPER(maeb)(CPUS390XState *env, uint64_t f1, uint64_t f2, uint64_t f3) { float32 ret = float32_muladd(f2, f3, f1, 0, &env->fpu_status); - handle_exceptions(env, GETPC()); + handle_exceptions(env, false, GETPC()); return ret; } @@ -621,7 +715,7 @@ uint64_t HELPER(madb)(CPUS390XState *env, uint64_t f1, uint64_t f2, uint64_t f3) { float64 ret = float64_muladd(f2, f3, f1, 0, &env->fpu_status); - handle_exceptions(env, GETPC()); + handle_exceptions(env, false, GETPC()); return ret; } @@ -631,7 +725,7 @@ uint64_t HELPER(mseb)(CPUS390XState *env, uint64_t f1, { float32 ret = float32_muladd(f2, f3, f1, float_muladd_negate_c, &env->fpu_status); - handle_exceptions(env, GETPC()); + handle_exceptions(env, false, GETPC()); return ret; } @@ -641,78 +735,63 @@ uint64_t HELPER(msdb)(CPUS390XState *env, uint64_t f1, { float64 ret = float64_muladd(f2, f3, f1, float_muladd_negate_c, &env->fpu_status); - handle_exceptions(env, GETPC()); + handle_exceptions(env, false, GETPC()); return ret; } +/* The rightmost bit has the number 11. */ +static inline uint16_t dcmask(int bit, bool neg) +{ + return 1 << (11 - bit - neg); +} + +#define DEF_FLOAT_DCMASK(_TYPE) \ +static uint16_t _TYPE##_dcmask(CPUS390XState *env, _TYPE f1) \ +{ \ + const bool neg = _TYPE##_is_neg(f1); \ + \ + /* Sorted by most common cases - only one class is possible */ \ + if (_TYPE##_is_normal(f1)) { \ + return dcmask(2, neg); \ + } else if (_TYPE##_is_zero(f1)) { \ + return dcmask(0, neg); \ + } else if (_TYPE##_is_denormal(f1)) { \ + return dcmask(4, neg); \ + } else if (_TYPE##_is_infinity(f1)) { \ + return dcmask(6, neg); \ + } else if (_TYPE##_is_quiet_nan(f1, &env->fpu_status)) { \ + return dcmask(8, neg); \ + } \ + /* signaling nan, as last remaining case */ \ + return dcmask(10, neg); \ +} +DEF_FLOAT_DCMASK(float32) +DEF_FLOAT_DCMASK(float64) +DEF_FLOAT_DCMASK(float128) + /* test data class 32-bit */ uint32_t HELPER(tceb)(CPUS390XState *env, uint64_t f1, uint64_t m2) { - float32 v1 = f1; - int neg = float32_is_neg(v1); - uint32_t cc = 0; - - if ((float32_is_zero(v1) && (m2 & (1 << (11-neg)))) || - (float32_is_infinity(v1) && (m2 & (1 << (5-neg)))) || - (float32_is_any_nan(v1) && (m2 & (1 << (3-neg)))) || - (float32_is_signaling_nan(v1, &env->fpu_status) && - (m2 & (1 << (1-neg))))) { - cc = 1; - } else if (m2 & (1 << (9-neg))) { - /* assume normalized number */ - cc = 1; - } - /* FIXME: denormalized? */ - return cc; + return (m2 & float32_dcmask(env, f1)) != 0; } /* test data class 64-bit */ uint32_t HELPER(tcdb)(CPUS390XState *env, uint64_t v1, uint64_t m2) { - int neg = float64_is_neg(v1); - uint32_t cc = 0; - - if ((float64_is_zero(v1) && (m2 & (1 << (11-neg)))) || - (float64_is_infinity(v1) && (m2 & (1 << (5-neg)))) || - (float64_is_any_nan(v1) && (m2 & (1 << (3-neg)))) || - (float64_is_signaling_nan(v1, &env->fpu_status) && - (m2 & (1 << (1-neg))))) { - cc = 1; - } else if (m2 & (1 << (9-neg))) { - /* assume normalized number */ - cc = 1; - } - /* FIXME: denormalized? */ - return cc; + return (m2 & float64_dcmask(env, v1)) != 0; } /* test data class 128-bit */ -uint32_t HELPER(tcxb)(CPUS390XState *env, uint64_t ah, - uint64_t al, uint64_t m2) -{ - float128 v1 = make_float128(ah, al); - int neg = float128_is_neg(v1); - uint32_t cc = 0; - - if ((float128_is_zero(v1) && (m2 & (1 << (11-neg)))) || - (float128_is_infinity(v1) && (m2 & (1 << (5-neg)))) || - (float128_is_any_nan(v1) && (m2 & (1 << (3-neg)))) || - (float128_is_signaling_nan(v1, &env->fpu_status) && - (m2 & (1 << (1-neg))))) { - cc = 1; - } else if (m2 & (1 << (9-neg))) { - /* assume normalized number */ - cc = 1; - } - /* FIXME: denormalized? */ - return cc; +uint32_t HELPER(tcxb)(CPUS390XState *env, uint64_t ah, uint64_t al, uint64_t m2) +{ + return (m2 & float128_dcmask(env, make_float128(ah, al))) != 0; } /* square root 32-bit */ uint64_t HELPER(sqeb)(CPUS390XState *env, uint64_t f2) { float32 ret = float32_sqrt(f2, &env->fpu_status); - handle_exceptions(env, GETPC()); + handle_exceptions(env, false, GETPC()); return ret; } @@ -720,7 +799,7 @@ uint64_t HELPER(sqeb)(CPUS390XState *env, uint64_t f2) uint64_t HELPER(sqdb)(CPUS390XState *env, uint64_t f2) { float64 ret = float64_sqrt(f2, &env->fpu_status); - handle_exceptions(env, GETPC()); + handle_exceptions(env, false, GETPC()); return ret; } @@ -728,44 +807,84 @@ uint64_t HELPER(sqdb)(CPUS390XState *env, uint64_t f2) uint64_t HELPER(sqxb)(CPUS390XState *env, uint64_t ah, uint64_t al) { float128 ret = float128_sqrt(make_float128(ah, al), &env->fpu_status); - handle_exceptions(env, GETPC()); + handle_exceptions(env, false, GETPC()); return RET128(ret); } -static const int fpc_to_rnd[4] = { +static const int fpc_to_rnd[8] = { float_round_nearest_even, float_round_to_zero, float_round_up, - float_round_down + float_round_down, + -1, + -1, + -1, + float_round_to_odd, }; /* set fpc */ void HELPER(sfpc)(CPUS390XState *env, uint64_t fpc) { + if (fpc_to_rnd[fpc & 0x7] == -1 || fpc & 0x03030088u || + (!s390_has_feat(S390_FEAT_FLOATING_POINT_EXT) && fpc & 0x4)) { + s390_program_interrupt(env, PGM_SPECIFICATION, ILEN_AUTO, GETPC()); + } + /* Install everything in the main FPC. */ env->fpc = fpc; /* Install the rounding mode in the shadow fpu_status. */ - set_float_rounding_mode(fpc_to_rnd[fpc & 3], &env->fpu_status); + set_float_rounding_mode(fpc_to_rnd[fpc & 0x7], &env->fpu_status); } /* set fpc and signal */ -void HELPER(sfas)(CPUS390XState *env, uint64_t val) +void HELPER(sfas)(CPUS390XState *env, uint64_t fpc) { uint32_t signalling = env->fpc; - uint32_t source = val; uint32_t s390_exc; - /* The contents of the source operand are placed in the FPC register; - then the flags in the FPC register are set to the logical OR of the - signalling flags and the source flags. */ - env->fpc = source | (signalling & 0x00ff0000); - set_float_rounding_mode(fpc_to_rnd[source & 3], &env->fpu_status); + if (fpc_to_rnd[fpc & 0x7] == -1 || fpc & 0x03030088u || + (!s390_has_feat(S390_FEAT_FLOATING_POINT_EXT) && fpc & 0x4)) { + s390_program_interrupt(env, PGM_SPECIFICATION, ILEN_AUTO, GETPC()); + } - /* If any signalling flag is 1 and the corresponding source mask - is also 1, a simulated-iee-exception trap occurs. */ - s390_exc = (signalling >> 16) & (source >> 24); + /* + * FPC is set to the FPC operand with a bitwise OR of the signalling + * flags. + */ + env->fpc = fpc | (signalling & 0x00ff0000); + set_float_rounding_mode(fpc_to_rnd[fpc & 0x7], &env->fpu_status); + + /* + * If any signaling flag is enabled in the new FPC mask, a + * simulated-iee-exception exception occurs. + */ + s390_exc = (signalling >> 16) & (fpc >> 24); if (s390_exc) { + if (s390_exc & S390_IEEE_MASK_INVALID) { + s390_exc = S390_IEEE_MASK_INVALID; + } else if (s390_exc & S390_IEEE_MASK_DIVBYZERO) { + s390_exc = S390_IEEE_MASK_DIVBYZERO; + } else if (s390_exc & S390_IEEE_MASK_OVERFLOW) { + s390_exc &= (S390_IEEE_MASK_OVERFLOW | S390_IEEE_MASK_INEXACT); + } else if (s390_exc & S390_IEEE_MASK_UNDERFLOW) { + s390_exc &= (S390_IEEE_MASK_UNDERFLOW | S390_IEEE_MASK_INEXACT); + } else if (s390_exc & S390_IEEE_MASK_INEXACT) { + s390_exc = S390_IEEE_MASK_INEXACT; + } else if (s390_exc & S390_IEEE_MASK_QUANTUM) { + s390_exc = S390_IEEE_MASK_QUANTUM; + } tcg_s390_data_exception(env, s390_exc | 3, GETPC()); } } + +/* set bfp rounding mode */ +void HELPER(srnm)(CPUS390XState *env, uint64_t rnd) +{ + if (rnd > 0x7 || fpc_to_rnd[rnd & 0x7] == -1) { + s390_program_interrupt(env, PGM_SPECIFICATION, ILEN_AUTO, GETPC()); + } + + env->fpc = deposit32(env->fpc, 0, 3, rnd); + set_float_rounding_mode(fpc_to_rnd[rnd & 0x7], &env->fpu_status); +} |