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re PR rtl-optimization/6842 (internal compiler error using MMX intrinsics with optimization) 

PR optimization/6842
	* combine.c (combine_simplify_rtx) [SUBREG]: Don't ICE if VOIDmode
	operand subreg cannot be simplified.

	* gcc.dg/20020531-1.c: New test.

From-SVN: r54462
This commit is contained in:
Jakub Jelinek 2002-06-10 23:47:45 +02:00 committed by Jakub Jelinek
parent 5d056e9be5
commit 156755acc0
4 changed files with 35 additions and 1 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2002-06-10 Jakub Jelinek <jakub@redhat.com>
PR optimization/6842
* combine.c (combine_simplify_rtx) [SUBREG]: Don't ICE if VOIDmode
operand subreg cannot be simplified.
2002-06-10 Jakub Jelinek <jakub@redhat.com>
* varasm.c (const_hash): Handle FDESC_EXPR like ADDR_EXPR.

7
gcc/combine.c
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@ -3866,7 +3866,12 @@ combine_simplify_rtx (x, op0_mode, last, in_dest)
/* simplify_subreg can't use gen_lowpart_for_combine. */
if (CONSTANT_P (SUBREG_REG (x))
&& subreg_lowpart_offset (mode, op0_mode) == SUBREG_BYTE (x))
&& subreg_lowpart_offset (mode, op0_mode) == SUBREG_BYTE (x)
/* Don't call gen_lowpart_for_combine if the inner mode
is VOIDmode and we cannot simplify it, as SUBREG without
inner mode is invalid. */
&& (GET_MODE (SUBREG_REG (x)) != VOIDmode
|| gen_lowpart_common (mode, SUBREG_REG (x))))
return gen_lowpart_for_combine (mode, SUBREG_REG (x));
if (GET_MODE_CLASS (GET_MODE (SUBREG_REG (x))) == MODE_CC)

2
gcc/testsuite/ChangeLog
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@ -4,6 +4,8 @@
* g++.dg/opt/vt1.C: New test.
* gcc.dg/20020531-1.c: New test.
2002-06-07 Roger Sayle <roger@eyesopen.com>
* gcc.dg/20020607-2.c: New test case.

21
gcc/testsuite/gcc.dg/20020531-1.c Normal file
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@ -0,0 +1,21 @@
/* PR optimization/6842
This testcase caused ICE when trying to optimize V8QI subreg of VOIDmode
CONST_DOUBLE. */
/* { dg-do compile { target i?86-*-* } } */
/* { dg-options "-O2 -mmmx" } */
typedef int __v8qi __attribute__ ((__mode__ (__V8QI__)));
extern void abort (void);
extern void exit (int);
void foo (void)
{
unsigned long long a = 0x0102030405060708LL;
unsigned long long b = 0x1020304050607080LL;
unsigned long long c;
c = (unsigned long long) __builtin_ia32_paddusb ((__v8qi) a, (__v8qi) b);
__builtin_ia32_emms ();
if (c != 0x1122334455667788)
abort ();
}