Mercurial > hg > CbC > CbC_gcc
view gcc/testsuite/gcc.dg/tree-ssa/pr22236.c @ 131:84e7813d76e9
gcc-8.2
author | mir3636 |
---|---|
date | Thu, 25 Oct 2018 07:37:49 +0900 |
parents | 04ced10e8804 |
children |
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/* { dg-do run } */ /* { dg-options "-O1 -fno-tree-vrp -fwrapv" } */ /* PR tree-optimization/22236 Avoid conversion of (signed char) {(uchar)1, +, (uchar)1}_x when it is not possible to prove that the scev does not wrap. In this PR, a sequence 1, 2, ..., 255 has to be converted to signed char, but this would wrap: 1, 2, ..., 127, -128, ... The result should not be a linear scev {(schar)1, +, (schar)1}_x. The conversion should be kept: (schar) {(uchar)1, +, (uchar)1}_x. */ void abort(void); static inline void foo (signed char a) { int b = a - 0x7F; if (b > 1) abort(); } int main() { unsigned char b; for(b = 0; b < 0xFF; b++) foo (b); return 0; }