diff options
Diffstat (limited to 'target-i386/op_helper.c')
| -rw-r--r-- | target-i386/op_helper.c | 14 |
1 files changed, 12 insertions, 2 deletions
diff --git a/target-i386/op_helper.c b/target-i386/op_helper.c index 26fe612048..5eea3221b3 100644 --- a/target-i386/op_helper.c +++ b/target-i386/op_helper.c @@ -5479,11 +5479,14 @@ target_ulong helper_bsf(target_ulong t0) return count; } -target_ulong helper_bsr(target_ulong t0) +target_ulong helper_lzcnt(target_ulong t0, int wordsize) { int count; target_ulong res, mask; - + + if (wordsize > 0 && t0 == 0) { + return wordsize; + } res = t0; count = TARGET_LONG_BITS - 1; mask = (target_ulong)1 << (TARGET_LONG_BITS - 1); @@ -5491,9 +5494,16 @@ target_ulong helper_bsr(target_ulong t0) count--; res <<= 1; } + if (wordsize > 0) { + return wordsize - 1 - count; + } return count; } +target_ulong helper_bsr(target_ulong t0) +{ + return helper_lzcnt(t0, 0); +} static int compute_all_eflags(void) { |