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.

diff --git a/ChangeLog b/ChangeLog
index af555291a9a0ceb9620aea1aad4dbf75dd86e156..f5b8d1e5527b1d932499782b1921e6fc9a953887 100644 (file)
--- 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
index a34525974a1d9f8e67577455c15a0ccada1cef81..e9d86ed08ab134a540e3dae5f97a9afb82cdb993 100644 (file)
--- 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