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re PR tree-optimization/92558 (Miscompare of 554.roms_r with -Ofast -march=znver2 -flto since r278289)

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2019-11-18  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/92558
	* tree-vect-loop.c (vect_create_epilog_for_reduction): When
	reducting the width of a reduction vector def update new_phis.

	* gcc.dg/vect/pr92558.c: New testcase.

From-SVN: r278400
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Richard Biener 2019-11-18 12:41:11 +00:00 committed by Richard Biener
parent 3d3a96a26e
commit 5be106b860
4 changed files with 35 additions and 0 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2019-11-18 Richard Biener <rguenther@suse.de>
PR tree-optimization/92558
* tree-vect-loop.c (vect_create_epilog_for_reduction): When
reducting the width of a reduction vector def update new_phis.
2019-11-18 Szabolcs Nagy <szabolcs.nagy@arm.com>
* configure.ac (gcc_cv_target_ldbl128): Set for powerpc*-*-linux-musl*

5
gcc/testsuite/ChangeLog
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@ -1,3 +1,8 @@
2019-11-18 Richard Biener <rguenther@suse.de>
PR tree-optimization/92558
* gcc.dg/vect/pr92558.c: New testcase.
2019-11-18 Martin Liska <mliska@suse.cz>
PR ipa/92529

23
gcc/testsuite/gcc.dg/vect/pr92558.c Normal file
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@ -0,0 +1,23 @@
/* { dg-additional-options "-mavx2" { target avx2_runtime } } */
void __attribute__((noipa))
foo (int * __restrict wsum, int * __restrict cff, int * __restrict weight)
{
for (int i = 0; i < 16; ++i)
{
*wsum += weight[2*i+0];
*cff += weight[2*i+1];
}
}
int main()
{
int weight[32];
for (int i = 0; i < 32; ++i)
weight[i] = i;
int wsum = 0, cff = 0;
foo (&wsum, &cff, weight);
if (wsum != 240 || cff != 256)
__builtin_abort ();
return 0;
}

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gcc/tree-vect-loop.c
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@ -5198,6 +5198,7 @@ vect_create_epilog_for_reduction (stmt_vec_info stmt_info,
new_temp = make_ssa_name (vectype1);
epilog_stmt = gimple_build_assign (new_temp, code, dst1, dst2);
gsi_insert_before (&exit_gsi, epilog_stmt, GSI_SAME_STMT);
new_phis[0] = epilog_stmt;
}
if (reduce_with_shift && !slp_reduc)