diff options
| author | H.J. Lu <hjl.tools@gmail.com> | 2017-06-23 11:29:38 -0700 |
|---|---|---|
| committer | H.J. Lu <hjl.tools@gmail.com> | 2017-06-23 11:29:38 -0700 |
| commit | acecb3f7de4892b68ec1b464a576ee84b3f97527 (patch) | |
| tree | f433c7ae9b498e9fefdc297a2f6f1c333f653582 | |
| parent | 67145d84d9719d270f63f4399e337a4bdcb778f5 (diff) | |
| download | glibc-hjl/pr21666/master.tar.gz | |
x86-64: Optimize L(between_2_3) in memcmp-avx2-movbe.Shjl/pr21666/master
Turn
movzbl -1(%rdi, %rdx), %edi
movzbl -1(%rsi, %rdx), %esi
orl %edi, %eax
orl %esi, %ecx
into
movb -1(%rdi, %rdx), %al
movb -1(%rsi, %rdx), %cl
* sysdeps/x86_64/multiarch/memcmp-avx2-movbe.S (between_2_3):
Replace movzbl and orl with movb.
| -rw-r--r-- | sysdeps/x86_64/multiarch/memcmp-avx2-movbe.S | 8 |
1 files changed, 3 insertions, 5 deletions
diff --git a/sysdeps/x86_64/multiarch/memcmp-avx2-movbe.S b/sysdeps/x86_64/multiarch/memcmp-avx2-movbe.S index 9d1921033e..abcc61c381 100644 --- a/sysdeps/x86_64/multiarch/memcmp-avx2-movbe.S +++ b/sysdeps/x86_64/multiarch/memcmp-avx2-movbe.S @@ -144,11 +144,9 @@ L(between_2_3): shll $8, %ecx bswap %eax bswap %ecx - movzbl -1(%rdi, %rdx), %edi - movzbl -1(%rsi, %rdx), %esi - orl %edi, %eax - orl %esi, %ecx - /* Subtraction is okay because the upper 8 bits a zero. */ + movb -1(%rdi, %rdx), %al + movb -1(%rsi, %rdx), %cl + /* Subtraction is okay because the upper 8 bits are zero. */ subl %ecx, %eax ret |