diff mbox series

tree-optimization/116610 - wrong SLP induction bias for mask peeling

Message ID 20240905092418.6B7FE3865491@sourceware.org
State Committed
Commit 6a1a856ba78589f7f5285b00ecd40ba2bbeef8b0
Headers
Series tree-optimization/116610 - wrong SLP induction bias for mask peeling |

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Commit Message

Richard Biener Sept. 5, 2024, 9:23 a.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.

Bootstrap and regtest running on x86_64-unknown-linux-gnu.

	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(-)
diff mbox series

Patch

diff --git a/gcc/tree-vect-loop.cc b/gcc/tree-vect-loop.cc
index 62cf9205059..c981ab656ae 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);