[llvm-branch-commits] [llvm] 4018806 - [NFC][SimplifyCFG] FoldBranchToCommonDest: add one more test with PHI
Roman Lebedev via llvm-branch-commits
llvm-branch-commits at lists.llvm.org
Fri Nov 27 01:52:34 PST 2020
Author: Roman Lebedev
Date: 2020-11-27T12:47:14+03:00
New Revision: 40188063296f3a55f7816b20f518fa99977145bb
URL: https://github.com/llvm/llvm-project/commit/40188063296f3a55f7816b20f518fa99977145bb
DIFF: https://github.com/llvm/llvm-project/commit/40188063296f3a55f7816b20f518fa99977145bb.diff
LOG: [NFC][SimplifyCFG] FoldBranchToCommonDest: add one more test with PHI
This is the problematic pattern i didn't think of,
that lead to revert of 2245fb8aaa1c1f85f53f7b19a1ee3ac69b1a1dfe
in f3abd54958ab90ba7c100d3fa936a3ce0dd2ad04.
Added:
Modified:
llvm/test/Transforms/SimplifyCFG/fold-branch-to-common-dest.ll
Removed:
################################################################################
diff --git a/llvm/test/Transforms/SimplifyCFG/fold-branch-to-common-dest.ll b/llvm/test/Transforms/SimplifyCFG/fold-branch-to-common-dest.ll
index 1a6f7955fd80..6f83a20c72da 100644
--- a/llvm/test/Transforms/SimplifyCFG/fold-branch-to-common-dest.ll
+++ b/llvm/test/Transforms/SimplifyCFG/fold-branch-to-common-dest.ll
@@ -3,6 +3,7 @@
declare void @sideeffect0()
declare void @sideeffect1()
+declare void @sideeffect2()
declare void @use8(i8)
; Basic cases, blocks have nothing other than the comparison itself.
@@ -304,6 +305,55 @@ final_right:
ret void
}
+define void @one_pred_with_extra_op_liveout_distant_phi(i8 %v0, i8 %v1) {
+; CHECK-LABEL: @one_pred_with_extra_op_liveout_distant_phi(
+; CHECK-NEXT: entry:
+; CHECK-NEXT: [[C0:%.*]] = icmp eq i8 [[V0:%.*]], 0
+; CHECK-NEXT: br i1 [[C0]], label [[PRED:%.*]], label [[LEFT_END:%.*]]
+; CHECK: pred:
+; CHECK-NEXT: [[C1:%.*]] = icmp eq i8 [[V1:%.*]], 0
+; CHECK-NEXT: br i1 [[C1]], label [[DISPATCH:%.*]], label [[FINAL_RIGHT:%.*]]
+; CHECK: dispatch:
+; CHECK-NEXT: [[V2_ADJ:%.*]] = add i8 [[V0]], [[V1]]
+; CHECK-NEXT: [[C2:%.*]] = icmp eq i8 [[V2_ADJ]], 0
+; CHECK-NEXT: br i1 [[C2]], label [[FINAL_LEFT:%.*]], label [[FINAL_RIGHT]]
+; CHECK: final_left:
+; CHECK-NEXT: call void @sideeffect0()
+; CHECK-NEXT: call void @use8(i8 [[V2_ADJ]])
+; CHECK-NEXT: br label [[LEFT_END]]
+; CHECK: left_end:
+; CHECK-NEXT: [[MERGE_LEFT:%.*]] = phi i8 [ [[V2_ADJ]], [[FINAL_LEFT]] ], [ 0, [[ENTRY:%.*]] ]
+; CHECK-NEXT: call void @sideeffect1()
+; CHECK-NEXT: call void @use8(i8 [[MERGE_LEFT]])
+; CHECK-NEXT: ret void
+; CHECK: final_right:
+; CHECK-NEXT: call void @sideeffect2()
+; CHECK-NEXT: ret void
+;
+entry:
+ %c0 = icmp eq i8 %v0, 0
+ br i1 %c0, label %pred, label %left_end
+pred:
+ %c1 = icmp eq i8 %v1, 0
+ br i1 %c1, label %dispatch, label %final_right
+dispatch:
+ %v2_adj = add i8 %v0, %v1
+ %c2 = icmp eq i8 %v2_adj, 0
+ br i1 %c2, label %final_left, label %final_right
+final_left:
+ call void @sideeffect0()
+ call void @use8(i8 %v2_adj)
+ br label %left_end
+left_end:
+ %merge_left = phi i8 [ %v2_adj, %final_left ], [ 0, %entry ]
+ call void @sideeffect1()
+ call void @use8(i8 %merge_left)
+ ret void
+final_right:
+ call void @sideeffect2()
+ ret void
+}
+
define void @two_preds_with_extra_op_liveout(i8 %v0, i8 %v1, i8 %v2, i8 %v3) {
; CHECK-LABEL: @two_preds_with_extra_op_liveout(
; CHECK-NEXT: entry:
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