* [PATCH] Fix PR46288
@ 2010-11-03 17:10 Richard Guenther
0 siblings, 0 replies; only message in thread
From: Richard Guenther @ 2010-11-03 17:10 UTC (permalink / raw)
To: gcc-patches
Bootstrapped and tested on x86_64-unknown-linux-gnu, applied.
Richard.
2010-11-03 Richard Guenther <rguenther@suse.de>
PR middle-end/46288
* predict.c (strip_predict_hints): Simply DCE builtin expect if
the result is unused.
* gcc.dg/pr46288.c: New testcase.
Index: gcc/predict.c
===================================================================
*** gcc/predict.c (revision 166249)
--- gcc/predict.c (working copy)
*************** strip_predict_hints (void)
*** 1329,1337 ****
&& gimple_call_num_args (stmt) == 2)
{
var = gimple_call_lhs (stmt);
! ass_stmt = gimple_build_assign (var, gimple_call_arg (stmt, 0));
!
! gsi_replace (&bi, ass_stmt, true);
}
}
gsi_next (&bi);
--- 1329,1345 ----
&& gimple_call_num_args (stmt) == 2)
{
var = gimple_call_lhs (stmt);
! if (var)
! {
! ass_stmt
! = gimple_build_assign (var, gimple_call_arg (stmt, 0));
! gsi_replace (&bi, ass_stmt, true);
! }
! else
! {
! gsi_remove (&bi, true);
! continue;
! }
}
}
gsi_next (&bi);
Index: gcc/testsuite/gcc.dg/pr46288.c
===================================================================
*** gcc/testsuite/gcc.dg/pr46288.c (revision 0)
--- gcc/testsuite/gcc.dg/pr46288.c (revision 0)
***************
*** 0 ****
--- 1,8 ----
+ /* { dg-do compile } */
+ /* { dg-options "-O -fno-tree-dce" } */
+
+ void foo (int i)
+ {
+ __builtin_expect (i, i);
+ }
+
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