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2017-09-18 Richard Biener <rguenther@suse.de>
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Backport from mainline
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2017-04-10 Richard Biener <rguenther@suse.de>
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PR middle-end/80362
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* fold-const.c (fold_binary_loc): Look at unstripped ops when
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looking for NEGATE_EXPR in -A / -B to A / B folding.
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* gcc.dg/torture/pr80362.c: New testcase.
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--- gcc/fold-const.c
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+++ gcc/fold-const.c
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@@ -11940,8 +11942,8 @@ fold_binary_loc (location_t loc,
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/* Convert -A / -B to A / B when the type is signed and overflow is
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undefined. */
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if ((!INTEGRAL_TYPE_P (type) || TYPE_OVERFLOW_UNDEFINED (type))
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- && TREE_CODE (arg0) == NEGATE_EXPR
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- && negate_expr_p (arg1))
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+ && TREE_CODE (op0) == NEGATE_EXPR
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+ && negate_expr_p (op1))
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{
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if (INTEGRAL_TYPE_P (type))
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fold_overflow_warning (("assuming signed overflow does not occur "
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--- /dev/null
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+++ gcc/testsuite/gcc.dg/torture/pr80362.c
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@@ -0,0 +1,11 @@
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+/* { dg-do run } */
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+/* { dg-additional-options "-fstrict-overflow" } */
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+
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+int main()
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+{
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+ signed char var_0, var_1 = -128;
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+ var_0 = (signed char)(-var_1) / 3;
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+ if (var_0 > 0)
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+ __builtin_abort();
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+ return 0;
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+}
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