commit 2e64237a8744dd50f9222293275fa52e7248ff76
Author: Fangrui Song <maskray@google.com>
Date:   Tue Nov 2 20:59:52 2021 -0700

    x86-64: Replace movzx with movzbl
    
    Clang cannot assemble movzx in the AT&T dialect mode.
    
    ../sysdeps/x86_64/strcmp.S:2232:16: error: invalid operand for instruction
     movzx (%rsi), %ecx
                   ^~~~
    
    Change movzx to movzbl, which follows the AT&T dialect and is used
    elsewhere in the file.
    
    Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
    (cherry picked from commit 6720d36b6623c5e48c070d86acf61198b33e144e)

diff --git a/sysdeps/x86_64/multiarch/strcmp-sse42.S b/sysdeps/x86_64/multiarch/strcmp-sse42.S
index bc19547b09639071..6197a723b9e0606e 100644
--- a/sysdeps/x86_64/multiarch/strcmp-sse42.S
+++ b/sysdeps/x86_64/multiarch/strcmp-sse42.S
@@ -1771,8 +1771,8 @@ LABEL(strcmp_exitz):
 	.p2align 4
 	// XXX Same as code above
 LABEL(Byte0):
-	movzx	(%rsi), %ecx
-	movzx	(%rdi), %eax
+	movzbl	(%rsi), %ecx
+	movzbl	(%rdi), %eax
 
 #if defined USE_AS_STRCASECMP_L || defined USE_AS_STRNCASECMP_L
 	leaq	_nl_C_LC_CTYPE_tolower+128*4(%rip), %rdx
diff --git a/sysdeps/x86_64/strcmp.S b/sysdeps/x86_64/strcmp.S
index 824e648230a15739..7f8a1bc756f86aee 100644
--- a/sysdeps/x86_64/strcmp.S
+++ b/sysdeps/x86_64/strcmp.S
@@ -2232,8 +2232,8 @@ LABEL(strcmp_exitz):
 
 	.p2align 4
 LABEL(Byte0):
-	movzx	(%rsi), %ecx
-	movzx	(%rdi), %eax
+	movzbl	(%rsi), %ecx
+	movzbl	(%rdi), %eax
 
 #if defined USE_AS_STRCASECMP_L || defined USE_AS_STRNCASECMP_L
 	leaq	_nl_C_LC_CTYPE_tolower+128*4(%rip), %rdx