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re PR rtl-optimization/29797 (Miscompiles bit test / set in OpenOffice)

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2006-11-12  Michael Matz  <matz@suse.de>
	    Roger Sayle  <roger@eyesopen.com>

	PR rtl-optimization/29797
	* ifcvt.c (noce_try_bitop): Correct calculation of bitnum on
	BITS_BIG_ENDIAN targets.

	* gcc.c-torture/execute/pr29797-1.c: New test case.

From-SVN: r118740
This commit is contained in:
Roger Sayle 2006-11-13 00:41:53 +00:00
parent d3a6450e36
commit 3b279c7ae7
4 changed files with 29 additions and 1 deletions
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7
gcc/ChangeLog
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@ -1,3 +1,10 @@
2006-11-12 Michael Matz <matz@suse.de>
Roger Sayle <roger@eyesopen.com>
PR rtl-optimization/29797
* ifcvt.c (noce_try_bitop): Correct calculation of bitnum on
BITS_BIG_ENDIAN targets.
2006-11-12 Kaveh R. Ghazi <ghazi@caip.rutgers.edu>
* builtins.c (fold_builtin_cosh): New.

4
gcc/ifcvt.c
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@ -1943,7 +1943,9 @@ noce_try_bitop (struct noce_if_info *if_info)
return FALSE;
bitnum = INTVAL (XEXP (cond, 2));
mode = GET_MODE (x);
if (bitnum >= HOST_BITS_PER_WIDE_INT)
if (BITS_BIG_ENDIAN)
bitnum = GET_MODE_BITSIZE (mode) - 1 - bitnum;
if (bitnum < 0 || bitnum >= HOST_BITS_PER_WIDE_INT)
return FALSE;
}
else

5
gcc/testsuite/ChangeLog
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@ -1,3 +1,8 @@
2006-11-12 Roger Sayle <roger@eyesopen.com>
PR rtl-optimization/29797
* gcc.c-torture/execute/pr29797-1.c: New test case.
2006-11-12 Kaveh R. Ghazi <ghazi@caip.rutgers.edu>
* gcc.dg/torture/builtin-symmetric-1.c: Add more cases.

14
gcc/testsuite/gcc.c-torture/execute/pr29797-1.c Normal file
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@ -0,0 +1,14 @@
extern void abort(void);
unsigned int bar(void) { return 32768; }
int main()
{
unsigned int nStyle = bar ();
if (nStyle & 32768)
nStyle |= 65536;
if (nStyle != (32768 | 65536))
abort ();
return 0;
}