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re PR target/79971 (ICE in const_binop, at fold-const.c:1554 on ARM target with saturated integers)

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2017-03-09  Richard Biener  <rguenther@suse.de>

	PR middle-end/79971
	* gimple-expr.c (useless_type_conversion_p): Preserve
	TYPE_SATURATING for fixed-point types.

	* gcc.dg/fixed-point/pr79971.c: New testcase.

From-SVN: r246002
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Richard Biener 2017-03-09 13:20:50 +00:00 committed by Richard Biener
parent 26d7dc48b6
commit 16967aff7a
4 changed files with 26 additions and 1 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2017-03-09 Richard Biener <rguenther@suse.de>
PR middle-end/79971
* gimple-expr.c (useless_type_conversion_p): Preserve
TYPE_SATURATING for fixed-point types.
2017-03-09 Richard Biener <rguenther@suse.de>
PR ipa/79970

2
gcc/gimple-expr.c
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@ -124,7 +124,7 @@ useless_type_conversion_p (tree outer_type, tree inner_type)
/* Fixed point types with the same mode are compatible. */
else if (FIXED_POINT_TYPE_P (inner_type)
&& FIXED_POINT_TYPE_P (outer_type))
return true;
return TYPE_SATURATING (inner_type) == TYPE_SATURATING (outer_type);
/* We need to take special care recursing to pointed-to types. */
else if (POINTER_TYPE_P (inner_type)

5
gcc/testsuite/ChangeLog
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@ -1,3 +1,8 @@
2017-03-09 Richard Biener <rguenther@suse.de>
PR middle-end/79971
* gcc.dg/fixed-point/pr79971.c: New testcase.
2017-03-09 Richard Biener <rguenther@suse.de>
PR ipa/79970

14
gcc/testsuite/gcc.dg/fixed-point/pr79971.c Normal file
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@ -0,0 +1,14 @@
/* { dg-do compile } */
/* { dg-options "-O3" } */
void
a ()
{
unsigned _Accum b;
for (b = 0.1; b; b += 0.1uk)
{
_Sat unsigned _Accum b;
for (b = 0; b <= 0.8; b = 0.1)
;
}
}