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tree-optimization/106513 - fix mistake in bswap symbolic number shifts 

This fixes a mistake in typing a local variable in the symbolic
shift routine.

	PR tree-optimization/106513
	* gimple-ssa-store-merging.cc (do_shift_rotate): Use uint64_t
	for head_marker.

	* gcc.dg/torture/pr106513.c: New testcase.

(cherry picked from commit f675afa4ee)
This commit is contained in:
Richard Biener 2022-08-10 15:45:22 +02:00
parent 4769ac6c5d
commit ab2ca2dbd5
2 changed files with 27 additions and 1 deletions
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2
gcc/gimple-ssa-store-merging.cc
View File

@ -263,7 +263,7 @@ do_shift_rotate (enum tree_code code,
int count)
{
int i, size = TYPE_PRECISION (n->type) / BITS_PER_UNIT;
unsigned head_marker;
uint64_t head_marker;
if (count < 0
|| count >= TYPE_PRECISION (n->type)

26
gcc/testsuite/gcc.dg/torture/pr106513.c Normal file
View File

@ -0,0 +1,26 @@
/* { dg-do run } */
typedef __INT64_TYPE__ int64_t;
__attribute__((noinline)) int64_t
swap64 (int64_t n)
{
return (((n & (((int64_t) 0xff) )) << 56) |
((n & (((int64_t) 0xff) << 8)) << 40) |
((n & (((int64_t) 0xff) << 16)) << 24) |
((n & (((int64_t) 0xff) << 24)) << 8) |
((n & (((int64_t) 0xff) << 32)) >> 8) |
((n & (((int64_t) 0xff) << 40)) >> 24) |
((n & (((int64_t) 0xff) << 48)) >> 40) |
((n & ((int64_t)(0xffull << 56))) >> 56));
}
int main (void)
{
volatile int64_t n = 0x8000000000000000ll;
if (swap64(n) != 0xffffffffffffff80ll)
__builtin_abort ();
return 0;
}