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re PR middle-end/59261 (FAIL: gcc.dg/vect/bb-slp-26.c -flto -ffat-lto-objects (internal compiler error))

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PR middle-end/59261
	* expmed.c (expand_mult): For MODE_VECTOR_INT multiplication
	if there is no vashl<mode>3 or ashl<mode>3 insn, skip_synth.

	* gcc.dg/pr59261.c: New test.

From-SVN: r207456
This commit is contained in:
Jakub Jelinek 2014-02-04 10:36:18 +01:00 committed by Jakub Jelinek
parent 5961d779d0
commit 66b3ed5f3d
4 changed files with 36 additions and 0 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2014-02-04 Jakub Jelinek <jakub@redhat.com>
PR middle-end/59261
* expmed.c (expand_mult): For MODE_VECTOR_INT multiplication
if there is no vashl<mode>3 or ashl<mode>3 insn, skip_synth.
2014-02-04 Richard Biener <rguenther@suse.de>
PR tree-optimization/60012

8
gcc/expmed.c
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@ -3136,6 +3136,14 @@ expand_mult (enum machine_mode mode, rtx op0, rtx op1, rtx target,
if (do_trapv)
goto skip_synth;
/* If mode is integer vector mode, check if the backend supports
vector lshift (by scalar or vector) at all. If not, we can't use
synthetized multiply. */
if (GET_MODE_CLASS (mode) == MODE_VECTOR_INT
&& optab_handler (vashl_optab, mode) == CODE_FOR_nothing
&& optab_handler (ashl_optab, mode) == CODE_FOR_nothing)
goto skip_synth;
/* These are the operations that are potentially turned into
a sequence of shifts and additions. */
mode_bitsize = GET_MODE_UNIT_BITSIZE (mode);

5
gcc/testsuite/ChangeLog
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@ -1,3 +1,8 @@
2014-02-04 Jakub Jelinek <jakub@redhat.com>
PR middle-end/59261
* gcc.dg/pr59261.c: New test.
2014-02-04 Richard Biener <rguenther@suse.de>
PR tree-optimization/60012

17
gcc/testsuite/gcc.dg/pr59261.c Normal file
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@ -0,0 +1,17 @@
/* PR middle-end/59261 */
/* { dg-do compile } */
/* { dg-options "-O2" } */
typedef signed char V __attribute__((vector_size (8)));
void
foo (V *a, V *b)
{
*a = *b * 3;
}
void
bar (V *a, V *b)
{
*a = *b * 4;
}