Optimize ____longjmp_chk for x86-64 a bit.

diff --git a/sysdeps/x86_64/____longjmp_chk.S b/sysdeps/x86_64/____longjmp_chk.S
index 50d2fca..23aa0cb 100644 (file)
--- a/sysdeps/x86_64/____longjmp_chk.S
+++ b/sysdeps/x86_64/____longjmp_chk.S
@@ -66,14 +66,12 @@ ENTRY(____longjmp_chk)
        cmpq    %r8, %rsp
        jbe     .Lok
 
-       subq    $32, %rsp
-       cfi_adjust_cfa_offset(32)
-       movq    %r10, 24(%rsp)
+       subq    $24, %rsp
+       cfi_adjust_cfa_offset(24)
        xorl    %edi, %edi
        movq    %rsp, %rsi
        movl    $__NR_sigaltstack, %eax
        syscall
-       movq    24(%rsp), %r10
        testl   %eax, %eax
        movl    $0, %eax
        jne     .Lok
@@ -127,7 +125,7 @@ ENTRY(____longjmp_chk)
 
 .Lfail:        xchgq   %r8, %rsp
        /* We want the stack trace to show that of the caller.  */
-       cfi_def_cfa(%rsp, 40)
+       cfi_def_cfa(%rsp, 32)
        cfi_restore(%rsp)
        cfi_register(%rbp, %r9)
        cfi_restore(%rip)