[PATCH] D156152: LoopVectorize/iv-select-cmp: add test for decreasing IV, const start

[Ramkumar Ramachandra via Phabricator via llvm-commits]

This revision was landed with ongoing or failed builds.
This revision was automatically updated to reflect the committed changes.
Closed by commit rG110ec1863af6: LoopVectorize/iv-select-cmp: add test for decreasing IV, const start (authored by artagnon).

Changed prior to commit:
  https://reviews.llvm.org/D156152?vs=543973&id=544334#toc

Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D156152/new/

https://reviews.llvm.org/D156152

Files:
  llvm/test/Transforms/LoopVectorize/iv-select-cmp.ll


Index: llvm/test/Transforms/LoopVectorize/iv-select-cmp.ll
===================================================================
--- llvm/test/Transforms/LoopVectorize/iv-select-cmp.ll
+++ llvm/test/Transforms/LoopVectorize/iv-select-cmp.ll
@@ -214,8 +214,30 @@
   ret float %cond
 }
 
-define i64 @not_vectorized_select_decreasing_induction_icmp(ptr nocapture readonly %a, ptr nocapture readonly %b, i64 %rdx.start, i64 %n) {
-; CHECK-LABEL: @not_vectorized_select_decreasing_induction_icmp
+define i64 @not_vectorized_select_decreasing_induction_icmp_const_start(ptr nocapture readonly %a) {
+; CHECK-LABEL: @not_vectorized_select_decreasing_induction_icmp_const_start
+; CHECK-NOT:   vector.body:
+;
+entry:
+  br label %for.body
+
+for.body:                                         ; preds = %entry, %for.body
+  %iv = phi i64 [ 19999, %entry ], [ %dec, %for.body ]
+  %rdx = phi i64 [ 331, %entry ], [ %spec.select, %for.body ]
+  %arrayidx = getelementptr inbounds i64, ptr %a, i64 %iv
+  %0 = load i64, ptr %arrayidx, align 8
+  %cmp = icmp sgt i64 %0, 3
+  %spec.select = select i1 %cmp, i64 %iv, i64 %rdx
+  %dec = add nsw i64 %iv, -1
+  %cmp.not = icmp eq i64 %iv, 0
+  br i1 %cmp.not, label %exit, label %for.body
+
+exit:                                             ; preds = %for.body
+  ret i64 %spec.select
+}
+
+define i64 @not_vectorized_select_decreasing_induction_icmp_non_const_start(ptr nocapture readonly %a, ptr nocapture readonly %b, i64 %rdx.start, i64 %n) {
+; CHECK-LABEL: @not_vectorized_select_decreasing_induction_icmp_non_const_start
 ; CHECK-NOT:   vector.body:
 ;
 entry:


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