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x86-64: Optimize L(between_2_3) in memcmp-avx2-movbe.S

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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.
This commit is contained in:
H.J. Lu
2017-06-23 12:45:57 -07:00
parent 52a8e5cb43
commit 049816c3be
2 changed files with 7 additions and 4 deletions
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5
ChangeLog
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@@ -1,3 +1,8 @@
2017-06-23 H.J. Lu <hongjiu.lu@intel.com>
* sysdeps/x86_64/multiarch/memcmp-avx2-movbe.S (between_2_3):
Replace movzbl and orl with movb.
2017-06-23 Gabriel F. T. Gomes <gftg@linux.vnet.ibm.com>
* manual/arith.texi (Infinity and NaN): Document SNANFN and SNANFNx.

6
sysdeps/x86_64/multiarch/memcmp-avx2-movbe.S
View File

@@ -144,10 +144,8 @@ 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
movb -1(%rdi, %rdx), %al
movb -1(%rsi, %rdx), %cl
/* Subtraction is okay because the upper 8 bits are zero. */
subl %ecx, %eax
ret