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re PR target/84700 (ICE on 32-bit BE powerpc targets w/ -misel -O1)

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PR target/84700
	* combine.c (combine_simplify_rtx): Don't try to simplify if
	if_then_else_cond returned non-NULL, but either true_rtx or false_rtx
	are equal to x.

	* gcc.target/powerpc/pr84700.c: New test.

From-SVN: r258263
This commit is contained in:
Jakub Jelinek 2018-03-05 23:13:58 +01:00 committed by Jakub Jelinek
parent 46cf7fa13b
commit 9a25c5ce6e
4 changed files with 29 additions and 1 deletions
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7
gcc/ChangeLog
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@ -1,3 +1,10 @@
2018-03-05 Jakub Jelinek <jakub@redhat.com>
PR target/84700
* combine.c (combine_simplify_rtx): Don't try to simplify if
if_then_else_cond returned non-NULL, but either true_rtx or false_rtx
are equal to x.
2018-03-05 Segher Boessenkool <segher@kernel.crashing.org>
* config/rs6000/rs6000.c (rs6000_loop_align): Don't align tiny loops

6
gcc/combine.c
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@ -5734,7 +5734,11 @@ combine_simplify_rtx (rtx x, machine_mode op0_mode, int in_dest,
/* If everything is a comparison, what we have is highly unlikely
to be simpler, so don't use it. */
&& ! (COMPARISON_P (x)
&& (COMPARISON_P (true_rtx) || COMPARISON_P (false_rtx))))
&& (COMPARISON_P (true_rtx) || COMPARISON_P (false_rtx)))
/* Similarly, if we end up with one of the expressions the same
as the original, it is certainly not simpler. */
&& ! rtx_equal_p (x, true_rtx)
&& ! rtx_equal_p (x, false_rtx))
{
rtx cop1 = const0_rtx;
enum rtx_code cond_code = simplify_comparison (NE, &cond, &cop1);

5
gcc/testsuite/ChangeLog
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@ -1,3 +1,8 @@
2018-03-05 Jakub Jelinek <jakub@redhat.com>
PR target/84700
* gcc.target/powerpc/pr84700.c: New test.
2018-03-05 Nathan Sidwell <nathan@acm.org>
PR c++/84702

12
gcc/testsuite/gcc.target/powerpc/pr84700.c Normal file
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@ -0,0 +1,12 @@
/* PR target/84700 */
/* { dg-do compile } */
/* { dg-options "-O1 -misel" } */
long long int
foo (long long int x)
{
long long int a = x < 2;
int b = a >= 0;
return a + ((x == 0) ? a : b);
}