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tree-optimization/113552 - fix num_call accounting in simd clone vectorization

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The following avoids using exact_log2 on the number of SIMD clone calls
to be emitted when vectorizing calls since that can easily be not
a power of two in which case it will return -1.  For different simd
clones the number of calls will differ by a multiply with a power of two
only so using floor_log2 is good enough here.

	PR tree-optimization/113552
	* tree-vect-stmts.cc (vectorizable_simd_clone_call): Use
	floor_log2 instead of exact_log2 on the number of calls.
This commit is contained in:
Richard Biener 2024-01-23 12:53:04 +01:00
parent ac98aa7828
commit d5d43dc399
1 changed files with 1 additions and 1 deletions
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2
gcc/tree-vect-stmts.cc
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@ -4071,7 +4071,7 @@ vectorizable_simd_clone_call (vec_info *vinfo, stmt_vec_info stmt_info,
|| (nargs != simd_nargs))
continue;
if (num_calls != 1)
this_badness += exact_log2 (num_calls) * 4096;
this_badness += floor_log2 (num_calls) * 4096;
if (n->simdclone->inbranch)
this_badness += 8192;
int target_badness = targetm.simd_clone.usable (n);