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fold-const: Fix BIT_INSERT_EXPR folding for BYTES_BIG_ENDIAN [PR116997]

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Fix constant folding of BIT_INSER_EXPR for BYTES_BIG_ENDIAN targets.

gcc/ChangeLog:

	PR middle-end/116997
	* fold-const.cc (fold_ternary_loc): Fix BIT_INSERT_EXPR constant folding
	for BYTES_BIG_ENDIAN targets.

gcc/testsuite/ChangeLog:

	* gcc.dg/vect/pr116997.c: New test.

Co-authored-by: Andrew Pinski <quic_apinski@quicinc.com>
This commit is contained in:
Andre Vieira 2024-10-14 16:24:07 +01:00
parent ddd46d481a
commit 2e30e90a0c
2 changed files with 20 additions and 0 deletions
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2
gcc/fold-const.cc
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@ -13712,6 +13712,8 @@ fold_ternary_loc (location_t loc, enum tree_code code, tree type,
{
unsigned HOST_WIDE_INT bitpos = tree_to_uhwi (op2);
unsigned bitsize = TYPE_PRECISION (TREE_TYPE (arg1));
if (BYTES_BIG_ENDIAN)
bitpos = TYPE_PRECISION (type) - bitpos - bitsize;
wide_int tem = (wi::to_wide (arg0)
& wi::shifted_mask (bitpos, bitsize, true,
TYPE_PRECISION (type)));

18
gcc/testsuite/gcc.dg/vect/pr116997.c Normal file
View file

@ -0,0 +1,18 @@
/* PR 116997. */
struct S0
{
unsigned f0;
signed f2 : 11;
signed : 6;
} GlobS, *Ptr = &GlobS;
const struct S0 Initializer = {7, 3};
int main (void)
{
for (unsigned i = 0; i <= 2; i++)
*Ptr = Initializer;
if (GlobS.f2 != 3)
__builtin_abort ();
return 0;
}