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Diffstat (limited to 'tests/tcg/ppc64/bcdsub.c')
| -rw-r--r-- | tests/tcg/ppc64/bcdsub.c | 134 |
1 files changed, 134 insertions, 0 deletions
diff --git a/tests/tcg/ppc64/bcdsub.c b/tests/tcg/ppc64/bcdsub.c new file mode 100644 index 0000000000..87c8c44a44 --- /dev/null +++ b/tests/tcg/ppc64/bcdsub.c @@ -0,0 +1,134 @@ +#include <assert.h> +#include <unistd.h> +#include <signal.h> +#include <stdint.h> + +#define CRF_LT (1 << 3) +#define CRF_GT (1 << 2) +#define CRF_EQ (1 << 1) +#define CRF_SO (1 << 0) +#define UNDEF 0 + +#ifdef __has_builtin +#if !__has_builtin(__builtin_bcdsub) +#define NO_BUILTIN_BCDSUB +#endif +#endif + +#ifdef NO_BUILTIN_BCDSUB +#define BCDSUB(T, A, B, PS) \ + ".long 4 << 26 | (" #T ") << 21 | (" #A ") << 16 | (" #B ") << 11" \ + " | 1 << 10 | (" #PS ") << 9 | 65\n\t" +#else +#define BCDSUB(T, A, B, PS) "bcdsub. " #T ", " #A ", " #B ", " #PS "\n\t" +#endif + +#define TEST(AH, AL, BH, BL, PS, TH, TL, CR6) \ + do { \ + int cr = 0; \ + uint64_t th, tl; \ + /* \ + * Use GPR pairs to load the VSR values and place the resulting VSR and\ + * CR6 in th, tl, and cr. Note that we avoid newer instructions (e.g., \ + * mtvsrdd/mfvsrld) so we can run this test on POWER8 machines. \ + */ \ + asm ("mtvsrd 32, %3\n\t" \ + "mtvsrd 33, %4\n\t" \ + "xxmrghd 32, 32, 33\n\t" \ + "mtvsrd 33, %5\n\t" \ + "mtvsrd 34, %6\n\t" \ + "xxmrghd 33, 33, 34\n\t" \ + BCDSUB(0, 0, 1, PS) \ + "mfocrf %0, 0b10\n\t" \ + "mfvsrd %1, 32\n\t" \ + "xxswapd 32, 32\n\t" \ + "mfvsrd %2, 32\n\t" \ + : "=r" (cr), "=r" (th), "=r" (tl) \ + : "r" (AH), "r" (AL), "r" (BH), "r" (BL) \ + : "v0", "v1", "v2"); \ + if (TH != UNDEF || TL != UNDEF) { \ + assert(tl == TL); \ + assert(th == TH); \ + } \ + assert((cr >> 4) == CR6); \ + } while (0) + +/* + * Unbounded result is equal to zero: + * sign = (PS) ? 0b1111 : 0b1100 + * CR6 = 0b0010 + */ +void test_bcdsub_eq(void) +{ + /* maximum positive BCD value */ + TEST(0x9999999999999999, 0x999999999999999c, + 0x9999999999999999, 0x999999999999999c, + 0, 0x0, 0xc, CRF_EQ); + TEST(0x9999999999999999, 0x999999999999999c, + 0x9999999999999999, 0x999999999999999c, + 1, 0x0, 0xf, CRF_EQ); +} + +/* + * Unbounded result is greater than zero: + * sign = (PS) ? 0b1111 : 0b1100 + * CR6 = (overflow) ? 0b0101 : 0b0100 + */ +void test_bcdsub_gt(void) +{ + /* maximum positive and negative one BCD values */ + TEST(0x9999999999999999, 0x999999999999999c, 0x0, 0x1d, 0, + 0x0, 0xc, (CRF_GT | CRF_SO)); + TEST(0x9999999999999999, 0x999999999999999c, 0x0, 0x1d, 1, + 0x0, 0xf, (CRF_GT | CRF_SO)); + + TEST(0x9999999999999999, 0x999999999999998c, 0x0, 0x1d, 0, + 0x9999999999999999, 0x999999999999999c, CRF_GT); + TEST(0x9999999999999999, 0x999999999999998c, 0x0, 0x1d, 1, + 0x9999999999999999, 0x999999999999999f, CRF_GT); +} + +/* + * Unbounded result is less than zero: + * sign = 0b1101 + * CR6 = (overflow) ? 0b1001 : 0b1000 + */ +void test_bcdsub_lt(void) +{ + /* positive zero and positive one BCD values */ + TEST(0x0, 0xc, 0x0, 0x1c, 0, 0x0, 0x1d, CRF_LT); + TEST(0x0, 0xc, 0x0, 0x1c, 1, 0x0, 0x1d, CRF_LT); + + /* maximum negative and positive one BCD values */ + TEST(0x9999999999999999, 0x999999999999999d, 0x0, 0x1c, 0, + 0x0, 0xd, (CRF_LT | CRF_SO)); + TEST(0x9999999999999999, 0x999999999999999d, 0x0, 0x1c, 1, + 0x0, 0xd, (CRF_LT | CRF_SO)); +} + +void test_bcdsub_invalid(void) +{ + TEST(0x0, 0x1c, 0x0, 0xf00, 0, UNDEF, UNDEF, CRF_SO); + TEST(0x0, 0x1c, 0x0, 0xf00, 1, UNDEF, UNDEF, CRF_SO); + + TEST(0x0, 0xf00, 0x0, 0x1c, 0, UNDEF, UNDEF, CRF_SO); + TEST(0x0, 0xf00, 0x0, 0x1c, 1, UNDEF, UNDEF, CRF_SO); + + TEST(0x0, 0xbad, 0x0, 0xf00, 0, UNDEF, UNDEF, CRF_SO); + TEST(0x0, 0xbad, 0x0, 0xf00, 1, UNDEF, UNDEF, CRF_SO); +} + +int main(void) +{ + struct sigaction action; + + action.sa_handler = _exit; + sigaction(SIGABRT, &action, NULL); + + test_bcdsub_eq(); + test_bcdsub_gt(); + test_bcdsub_lt(); + test_bcdsub_invalid(); + + return 0; +} |