Mercurial > hg > CbC > CbC_gcc
view gcc/testsuite/gcc.dg/torture/badshift.c @ 131:84e7813d76e9
gcc-8.2
author | mir3636 |
---|---|
date | Thu, 25 Oct 2018 07:37:49 +0900 |
parents | 04ced10e8804 |
children |
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/* PR rtl-optimization/20532 */ /* { dg-do run } */ /* { dg-options "" } */ /* { dg-options "-march=i386" { target { { i?86-*-* x86_64-*-* } && ia32 } } } */ /* We used to optimize the DImode shift-by-32 to zero because in combine we turned: (v << 31) + (v << 31) into: (v * (((HOST_WIDE_INT)1 << 31) + ((HOST_WIDE_INT)1 << 31))) With a 32-bit HOST_WIDE_INT, the coefficient overflowed to zero. */ unsigned long long int badshift(unsigned long long int v) { return v << 31 << 1; } extern void abort (); int main() { if (badshift (1) == 0) abort (); return 0; }