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backport: re PR rtl-optimization/55838 (ICE in extract_insn (unrecognizable insn) with -O -funroll-loops) 

Backported from mainline
	2013-01-03  Jakub Jelinek  <jakub@redhat.com>

	PR rtl-optimization/55838
	* loop-iv.c (iv_number_of_iterations): Call lowpart_subreg on
	iv0.step, iv1.step and step.

	* gcc.dg/pr55838.c: New test.

From-SVN: r195654
This commit is contained in:
Jakub Jelinek 2013-02-01 15:07:35 +01:00 committed by Jakub Jelinek
parent fe7309785e
commit 441b3f028c
4 changed files with 28 additions and 0 deletions
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6
gcc/ChangeLog
View File

@ -1,6 +1,12 @@
2013-02-01 Jakub Jelinek <jakub@redhat.com>
Backported from mainline
2013-01-03 Jakub Jelinek <jakub@redhat.com>
PR rtl-optimization/55838
* loop-iv.c (iv_number_of_iterations): Call lowpart_subreg on
iv0.step, iv1.step and step.
2012-11-23 Jakub Jelinek <jakub@redhat.com>
PR c++/54046

4
gcc/loop-iv.c
View File

@ -2361,6 +2361,9 @@ iv_number_of_iterations (struct loop *loop, rtx insn, rtx condition,
iv1.step = const0_rtx;
}
iv0.step = lowpart_subreg (mode, iv0.step, comp_mode);
iv1.step = lowpart_subreg (mode, iv1.step, comp_mode);
/* This is either infinite loop or the one that ends immediately, depending
on initial values. Unswitching should remove this kind of conditions. */
if (iv0.step == const0_rtx && iv1.step == const0_rtx)
@ -2471,6 +2474,7 @@ iv_number_of_iterations (struct loop *loop, rtx insn, rtx condition,
step = simplify_gen_unary (NEG, comp_mode, iv1.step, comp_mode);
else
step = iv0.step;
step = lowpart_subreg (mode, step, comp_mode);
delta = simplify_gen_binary (MINUS, comp_mode, iv1.base, iv0.base);
delta = lowpart_subreg (mode, delta, comp_mode);
delta = simplify_gen_binary (UMOD, mode, delta, step);

5
gcc/testsuite/ChangeLog
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@ -1,6 +1,11 @@
2013-02-01 Jakub Jelinek <jakub@redhat.com>
Backported from mainline
2013-01-03 Jakub Jelinek <jakub@redhat.com>
PR rtl-optimization/55838
* gcc.dg/pr55838.c: New test.
2012-12-13 Jakub Jelinek <jakub@redhat.com>
PR c++/55652

13
gcc/testsuite/gcc.dg/pr55838.c Normal file
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@ -0,0 +1,13 @@
/* PR rtl-optimization/55838 */
/* { dg-do compile } */
/* { dg-options "-O2 -funroll-loops" } */
int a;
unsigned char c;
void
f (void)
{
while (c++ < 2)
c = a += 129;
}