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middle-end/103248 - fix RDIV_EXPR handling with fixed point

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This fixes the previous adjustment to operation_could_trap_helper_p
where I failed to realize that RDIV_EXPR is also used for
fixed-point types.  It also fixes that handling by properly
checking for a fixed_zerop divisor.

2021-11-16  Richard Biener  <rguenther@suse.de>

	PR middle-end/103248
	* tree-eh.c (operation_could_trap_helper_p): Properly handle
	fixed-point RDIV_EXPR.

	* gcc.dg/pr103248.c: New testcase.
This commit is contained in:
Richard Biener 2021-11-16 11:47:26 +01:00
parent 0fc859f5ef
commit fb15abdc9b
2 changed files with 17 additions and 3 deletions
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8
gcc/testsuite/gcc.dg/pr103248.c Normal file
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@ -0,0 +1,8 @@
/* { dg-do compile } */
/* { dg-require-effective-target fixed_point } */
/* { dg-options "-fnon-call-exceptions" } */
_Accum sa;
int c;
void div_csa() { c /= sa; }

12
gcc/tree-eh.c
View file

@ -2474,10 +2474,16 @@ operation_could_trap_helper_p (enum tree_code op,
return false;
case RDIV_EXPR:
if (honor_snans)
if (fp_operation)
{
if (honor_snans)
return true;
return flag_trapping_math;
}
/* Fixed point operations also use RDIV_EXPR. */
if (!TREE_CONSTANT (divisor) || fixed_zerop (divisor))
return true;
gcc_assert (fp_operation);
return flag_trapping_math;
return false;
case LT_EXPR:
case LE_EXPR: