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middle-end/103485 - fix conversion kind for vectors 

This makes sure to use a VIEW_CONVERT_EXPR for converting
vector signedness in the -((int)x >> (prec - 1)) to (unsigned)x >> (prec - 1)
simplification.

2021-11-30  Richard Biener  <rguenther@suse.de>

	PR middle-end/103485
	* match.pd (-((int)x >> (prec - 1)) to (unsigned)x >> (prec - 1)):
	Use VIEW_CONVERT_EXPR for vectors.

	* gcc.dg/pr103485.c: New testcase.
This commit is contained in:
Richard Biener 2021-11-30 08:19:24 +01:00
parent 930e763782
commit e2521cd2d2
2 changed files with 13 additions and 1 deletions
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4
gcc/match.pd
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@ -1611,7 +1611,9 @@ DEFINE_INT_AND_FLOAT_ROUND_FN (RINT)
(with { tree stype = TREE_TYPE (@0);
tree ntype = TYPE_UNSIGNED (stype) ? signed_type_for (stype)
: unsigned_type_for (stype); }
(convert (rshift:ntype (convert:ntype @0) @1)))))
(if (VECTOR_TYPE_P (type))
(view_convert (rshift (view_convert:ntype @0) @1))
(convert (rshift (convert:ntype @0) @1))))))
/* Try to fold (type) X op CST -> (type) (X op ((type-x) CST))
when profitable.

10
gcc/testsuite/gcc.dg/pr103485.c Normal file
View File

@ -0,0 +1,10 @@
/* { dg-do compile } */
int foo_v256u128_0;
unsigned __attribute__((__vector_size__ (sizeof(unsigned) * 8))) foo_v256u8_0;
void
foo (void)
{
foo_v256u8_0 -= (foo_v256u8_0 >> sizeof (foo_v256u8_0) - 1) + foo_v256u128_0;
}