diff options
Diffstat (limited to 'gcc/testsuite/gcc.target/i386/pr120032-2.c')
| -rw-r--r-- | gcc/testsuite/gcc.target/i386/pr120032-2.c | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/gcc/testsuite/gcc.target/i386/pr120032-2.c b/gcc/testsuite/gcc.target/i386/pr120032-2.c new file mode 100644 index 0000000..ea2ad40 --- /dev/null +++ b/gcc/testsuite/gcc.target/i386/pr120032-2.c @@ -0,0 +1,22 @@ +/* { dg-do compile } */ +/* { dg-options "-O2 -mlzcnt" } */ + +unsigned int +ZSTD_countLeadingZeros32_fallback(unsigned int val) +{ + static const unsigned char DeBruijnClz[32] + = { 0, 9, 1, 10, 13, 21, 2, 29, + 11, 14, 16, 18, 22, 25, 3, 30, + 8, 12, 20, 28, 15, 17, 24, 7, + 19, 27, 23, 6, 26, 5, 4, 31}; + if (val == 0) + __builtin_abort (); + val |= val >> 1; + val |= val >> 2; + val |= val >> 4; + val |= val >> 8; + val |= val >> 16; + return 31 - DeBruijnClz[(val * 0x07C4ACDDU) >> 27]; +} + +/* { dg-final { scan-assembler "lzcnt" } } */ |