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authorH.J. Lu <hjl.tools@gmail.com>2017-06-23 11:29:38 -0700
committerH.J. Lu <hjl.tools@gmail.com>2017-06-23 11:29:38 -0700
commitacecb3f7de4892b68ec1b464a576ee84b3f97527 (patch)
treef433c7ae9b498e9fefdc297a2f6f1c333f653582
parent67145d84d9719d270f63f4399e337a4bdcb778f5 (diff)
downloadtermbaud-hjl/pr21666/master.tar.gz
termbaud-hjl/pr21666/master.tar.xz
termbaud-hjl/pr21666/master.zip
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.S8
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 9d1921033e1..abcc61c3818 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