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[2/3] tree-optimization/116610 - wrong SLP induction bias for mask peeling

Message ID 20240905133744.9C002384B83E@sourceware.org
State New
Headers show
Series [1/3] tree-optimization/116609 - SLP live lane vectorization with partial vectors | expand

Commit Message

Richard Biener Sept. 5, 2024, 1:36 p.m. UTC 
The following fixes a mistake when applying the bias for peeling via
masking to the inital value of SLP inductions.

This resolves gcc.target/aarch64/sve/peel_ind_1.c (a scan-assembler
only unfortunately) when forcing single-lane SLP for it.

	PR tree-optimization/116610
	* tree-vect-loop.cc (vectorizable_induction): Use MINUS_EXPR
	to apply a mask peeling adjustment.
---
 gcc/tree-vect-loop.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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Patch

diff --git a/gcc/tree-vect-loop.cc b/gcc/tree-vect-loop.cc
index 31cdc4bf53d..a879a13bbf0 100644
--- a/gcc/tree-vect-loop.cc
+++ b/gcc/tree-vect-loop.cc
@@ -10543,7 +10543,7 @@  vectorizable_induction (loop_vec_info loop_vinfo,
 	  vec_steps.safe_push (vec_step);
 	  tree step_mul = gimple_build_vector (&init_stmts, &mul_elts);
 	  if (peel_mul)
-	    step_mul = gimple_build (&init_stmts, PLUS_EXPR, step_vectype,
+	    step_mul = gimple_build (&init_stmts, MINUS_EXPR, step_vectype,
 				     step_mul, peel_mul);
 	  if (!init_node)
 	    vec_init = gimple_build_vector (&init_stmts, &init_elts);