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re PR rtl-optimization/49799 (gcc arm generates illegal sbfx instruction)

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PR rtl-optimization/49799

	* combine.c (make_compound_operation): Check if the bit field is valid
	before change it to bit field extraction.

	* gcc.dg/pr49799.c: New test case.

From-SVN: r176911
This commit is contained in:
Wei Guozhi 2011-07-29 01:27:29 +00:00 • committed by Wei Guozhi
parent 4bd1d898d2
commit 154516d9d2
4 changed files with 37 additions and 0 deletions
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6
gcc/ChangeLog
View file

@ -1,3 +1,9 @@
2011-07-29 Wei Guozhi <carrot@google.com>
PR rtl-optimization/49799
* combine.c (make_compound_operation): Check if the bit field is valid
before change it to bit field extraction.
2011-07-29 Bernd Schmidt <bernds@codesourcery.com>
PR rtl-optimization/49891

1
gcc/combine.c
View file

@ -7787,6 +7787,7 @@ make_compound_operation (rtx x, enum rtx_code in_code)
&& GET_CODE (lhs) == ASHIFT
&& CONST_INT_P (XEXP (lhs, 1))
&& INTVAL (rhs) >= INTVAL (XEXP (lhs, 1))
&& INTVAL (XEXP (lhs, 1)) >= 0
&& INTVAL (rhs) < mode_width)
{
new_rtx = make_compound_operation (XEXP (lhs, 0), next_code);

5
gcc/testsuite/ChangeLog
View file

@ -1,3 +1,8 @@
2011-07-29 Wei Guozhi <carrot@google.com>
PR rtl-optimization/49799
* gcc.dg/pr49799.c: New test case.
2011-07-22 Sebastian Pop <sebastian.pop@amd.com>
PR middle-end/48648

25
gcc/testsuite/gcc.dg/pr49799.c Normal file
View file

@ -0,0 +1,25 @@
/* PR rtl-optimization/49799 */
/* { dg-do assemble } */
/* { dg-options "-O2 -w" } */
static __inline int bar(int a)
{
int tmp;
if (a <= 0) a ^= 0xFFFFFFFF;
return tmp - 1;
}
void foo(short *K)
{
short tmp;
short *pptr, P[14];
pptr = P;
tmp = bar(*K);
*pptr = (*K << tmp) >> 16;
if (*P < tmp)
*K++ = 0;
}