Replace PREINIT_FUNCTION@PLT with *%rax in call

Since we have loaded address of PREINIT_FUNCTION into %rax, we can avoid extra branch to PLT slot. [BZ #19745] * sysdeps/x86_64/crti.S (_init): Replace PREINIT_FUNCTION@PLT with *%rax in call.
git-mirror · Mar 5, 2016 · 16b23e0 · 16b23e0
1 parent 21683b5
commit 16b23e0
Show file tree

Hide file tree

Showing 2 changed files with 7 additions and 1 deletion.
diff --git a/ChangeLog b/ChangeLog
@@ -1,3 +1,9 @@
+2016-03-04  H.J. Lu  <hongjiu.lu@intel.com>
+
+	[BZ #19745]
+	* sysdeps/x86_64/crti.S (_init): Replace PREINIT_FUNCTION@PLT
+	with *%rax in call.
+
 2016-03-04  H.J. Lu  <hongjiu.lu@intel.com>
 
 	[BZ #19745]

diff --git a/sysdeps/x86_64/crti.S b/sysdeps/x86_64/crti.S
@@ -66,7 +66,7 @@ _init:
 	movq PREINIT_FUNCTION@GOTPCREL(%rip), %rax
 	testq %rax, %rax
 	je .Lno_weak_fn
-	call PREINIT_FUNCTION@PLT
+	call *%rax
 .Lno_weak_fn:
 #else
 	call PREINIT_FUNCTION