update to glibc-2.28-251.2.src.rpm

Signed-off-by: Zhao Hang <wb-zh951434@alibaba-inc.com>

glibc-RHEL-15696-95.patch

@@ -0,0 +1,122 @@
+From 670b54bc585ea4a94f3b2e9272ba44aa6b730b73 Mon Sep 17 00:00:00 2001
+From: Noah Goldstein <goldstein.w.n@gmail.com>
+Date: Wed, 23 Mar 2022 16:57:36 -0500
+Subject: [PATCH] x86: Optimize str{n}casecmp TOLOWER logic in strcmp.S
+Content-type: text/plain; charset=UTF-8
+
+Slightly faster method of doing TOLOWER that saves an
+instruction.
+
+Also replace the hard coded 5-byte no with .p2align 4. On builds with
+CET enabled this misaligned entry to strcasecmp.
+
+geometric_mean(N=40) of all benchmarks New / Original: .894
+
+All string/memory tests pass.
+Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
+---
+ sysdeps/x86_64/strcmp.S | 64 +++++++++++++++++++----------------------
+ 1 file changed, 29 insertions(+), 35 deletions(-)
+
+diff --git a/sysdeps/x86_64/strcmp.S b/sysdeps/x86_64/strcmp.S
+index aa6df898..f454ce5b 100644
+--- a/sysdeps/x86_64/strcmp.S
++++ b/sysdeps/x86_64/strcmp.S
+@@ -78,9 +78,8 @@ ENTRY2 (__strcasecmp)
+ 	movq	__libc_tsd_LOCALE@gottpoff(%rip),%rax
+ 	mov	%fs:(%rax),%RDX_LP
+ 
+-	// XXX 5 byte should be before the function
+-	/* 5-byte NOP.  */
+-	.byte	0x0f,0x1f,0x44,0x00,0x00
++	/* Either 1 or 5 bytes (dependeing if CET is enabled).  */
++	.p2align 4
+ END2 (__strcasecmp)
+ # ifndef NO_NOLOCALE_ALIAS
+ weak_alias (__strcasecmp, strcasecmp)
+@@ -97,9 +96,8 @@ ENTRY2 (__strncasecmp)
+ 	movq	__libc_tsd_LOCALE@gottpoff(%rip),%rax
+ 	mov	%fs:(%rax),%RCX_LP
+ 
+-	// XXX 5 byte should be before the function
+-	/* 5-byte NOP.  */
+-	.byte	0x0f,0x1f,0x44,0x00,0x00
++	/* Either 1 or 5 bytes (dependeing if CET is enabled).  */
++	.p2align 4
+ END2 (__strncasecmp)
+ # ifndef NO_NOLOCALE_ALIAS
+ weak_alias (__strncasecmp, strncasecmp)
+@@ -149,22 +147,22 @@ ENTRY (STRCMP)
+ #if defined USE_AS_STRCASECMP_L || defined USE_AS_STRNCASECMP_L
+ 	.section .rodata.cst16,"aM",@progbits,16
+ 	.align 16
+-.Lbelowupper:
+-	.quad	0x4040404040404040
+-	.quad	0x4040404040404040
+-.Ltopupper:
+-	.quad	0x5b5b5b5b5b5b5b5b
+-	.quad	0x5b5b5b5b5b5b5b5b
+-.Ltouppermask:
++.Llcase_min:
++	.quad	0x3f3f3f3f3f3f3f3f
++	.quad	0x3f3f3f3f3f3f3f3f
++.Llcase_max:
++	.quad	0x9999999999999999
++	.quad	0x9999999999999999
++.Lcase_add:
+ 	.quad	0x2020202020202020
+ 	.quad	0x2020202020202020
+ 	.previous
+-	movdqa	.Lbelowupper(%rip), %xmm5
+-# define UCLOW_reg %xmm5
+-	movdqa	.Ltopupper(%rip), %xmm6
+-# define UCHIGH_reg %xmm6
+-	movdqa	.Ltouppermask(%rip), %xmm7
+-# define LCQWORD_reg %xmm7
++	movdqa	.Llcase_min(%rip), %xmm5
++# define LCASE_MIN_reg %xmm5
++	movdqa	.Llcase_max(%rip), %xmm6
++# define LCASE_MAX_reg %xmm6
++	movdqa	.Lcase_add(%rip), %xmm7
++# define CASE_ADD_reg %xmm7
+ #endif
+ 	cmp	$0x30, %ecx
+ 	ja	LABEL(crosscache)	/* rsi: 16-byte load will cross cache line */
+@@ -175,22 +173,18 @@ ENTRY (STRCMP)
+ 	movhpd	8(%rdi), %xmm1
+ 	movhpd	8(%rsi), %xmm2
+ #if defined USE_AS_STRCASECMP_L || defined USE_AS_STRNCASECMP_L
+-# define TOLOWER(reg1, reg2) \
+-	movdqa	reg1, %xmm8;					\
+-	movdqa	UCHIGH_reg, %xmm9;				\
+-	movdqa	reg2, %xmm10;					\
+-	movdqa	UCHIGH_reg, %xmm11;				\
+-	pcmpgtb	UCLOW_reg, %xmm8;				\
+-	pcmpgtb	reg1, %xmm9;					\
+-	pcmpgtb	UCLOW_reg, %xmm10;				\
+-	pcmpgtb	reg2, %xmm11;					\
+-	pand	%xmm9, %xmm8;					\
+-	pand	%xmm11, %xmm10;					\
+-	pand	LCQWORD_reg, %xmm8;				\
+-	pand	LCQWORD_reg, %xmm10;				\
+-	por	%xmm8, reg1;					\
+-	por	%xmm10, reg2
+-	TOLOWER (%xmm1, %xmm2)
++#  define TOLOWER(reg1, reg2) \
++	movdqa	LCASE_MIN_reg, %xmm8;					\
++	movdqa	LCASE_MIN_reg, %xmm9;					\
++	paddb	reg1, %xmm8;					\
++	paddb	reg2, %xmm9;					\
++	pcmpgtb	LCASE_MAX_reg, %xmm8;				\
++	pcmpgtb	LCASE_MAX_reg, %xmm9;				\
++	pandn	CASE_ADD_reg, %xmm8;					\
++	pandn	CASE_ADD_reg, %xmm9;					\
++	paddb	%xmm8, reg1;					\
++	paddb	%xmm9, reg2
++	TOLOWER	(%xmm1, %xmm2)
+ #else
+ # define TOLOWER(reg1, reg2)
+ #endif
+-- 
+GitLab
+