[llvm] 394b4fd - [NFC][SimplifyCFG] Add test coverage for FoldBranchToCommonDest xform with live-out bonus instuctions
Roman Lebedev via llvm-commits
llvm-commits at lists.llvm.org
Thu Nov 26 11:52:09 PST 2020
Author: Roman Lebedev
Date: 2020-11-26T22:51:21+03:00
New Revision: 394b4fdb41542f695ed478c33275c54afb081efe
URL: https://github.com/llvm/llvm-project/commit/394b4fdb41542f695ed478c33275c54afb081efe
DIFF: https://github.com/llvm/llvm-project/commit/394b4fdb41542f695ed478c33275c54afb081efe.diff
LOG: [NFC][SimplifyCFG] Add test coverage for FoldBranchToCommonDest xform with live-out bonus instuctions
The uses of the bonus instructions should not be preventing the transformation.
Added:
llvm/test/Transforms/SimplifyCFG/fold-branch-to-common-dest.ll
Modified:
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
new file mode 100644
index 000000000000..1a6f7955fd80
--- /dev/null
+++ b/llvm/test/Transforms/SimplifyCFG/fold-branch-to-common-dest.ll
@@ -0,0 +1,571 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
+; RUN: opt < %s -S -simplifycfg -bonus-inst-threshold=10 | FileCheck %s
+
+declare void @sideeffect0()
+declare void @sideeffect1()
+declare void @use8(i8)
+
+; Basic cases, blocks have nothing other than the comparison itself.
+
+define void @one_pred(i8 %v0, i8 %v1) {
+; CHECK-LABEL: @one_pred(
+; CHECK-NEXT: pred:
+; CHECK-NEXT: [[C0:%.*]] = icmp eq i8 [[V0:%.*]], 0
+; CHECK-NEXT: [[C1:%.*]] = icmp eq i8 [[V1:%.*]], 0
+; CHECK-NEXT: [[OR_COND:%.*]] = and i1 [[C0]], [[C1]]
+; CHECK-NEXT: br i1 [[OR_COND]], label [[FINAL_LEFT:%.*]], label [[FINAL_RIGHT:%.*]]
+; CHECK: final_left:
+; CHECK-NEXT: call void @sideeffect0()
+; CHECK-NEXT: ret void
+; CHECK: final_right:
+; CHECK-NEXT: call void @sideeffect1()
+; CHECK-NEXT: ret void
+;
+pred:
+ %c0 = icmp eq i8 %v0, 0
+ br i1 %c0, label %dispatch, label %final_right
+dispatch:
+ %c1 = icmp eq i8 %v1, 0
+ br i1 %c1, label %final_left, label %final_right
+final_left:
+ call void @sideeffect0()
+ ret void
+final_right:
+ call void @sideeffect1()
+ ret void
+}
+
+define void @two_preds(i8 %v0, i8 %v1, i8 %v2, i8 %v3) {
+; CHECK-LABEL: @two_preds(
+; CHECK-NEXT: entry:
+; CHECK-NEXT: [[C0:%.*]] = icmp eq i8 [[V0:%.*]], 0
+; CHECK-NEXT: br i1 [[C0]], label [[PRED0:%.*]], label [[PRED1:%.*]]
+; CHECK: pred0:
+; CHECK-NEXT: [[C1:%.*]] = icmp eq i8 [[V1:%.*]], 0
+; CHECK-NEXT: [[C3_OLD:%.*]] = icmp eq i8 [[V3:%.*]], 0
+; CHECK-NEXT: [[OR_COND1:%.*]] = or i1 [[C1]], [[C3_OLD]]
+; CHECK-NEXT: br i1 [[OR_COND1]], label [[FINAL_LEFT:%.*]], label [[FINAL_RIGHT:%.*]]
+; CHECK: pred1:
+; CHECK-NEXT: [[C2:%.*]] = icmp eq i8 [[V2:%.*]], 0
+; CHECK-NEXT: [[C3:%.*]] = icmp eq i8 [[V3]], 0
+; CHECK-NEXT: [[OR_COND:%.*]] = and i1 [[C2]], [[C3]]
+; CHECK-NEXT: br i1 [[OR_COND]], label [[FINAL_LEFT]], label [[FINAL_RIGHT]]
+; CHECK: final_left:
+; CHECK-NEXT: call void @sideeffect0()
+; CHECK-NEXT: ret void
+; CHECK: final_right:
+; CHECK-NEXT: call void @sideeffect1()
+; CHECK-NEXT: ret void
+;
+entry:
+ %c0 = icmp eq i8 %v0, 0
+ br i1 %c0, label %pred0, label %pred1
+pred0:
+ %c1 = icmp eq i8 %v1, 0
+ br i1 %c1, label %final_left, label %dispatch
+pred1:
+ %c2 = icmp eq i8 %v2, 0
+ br i1 %c2, label %dispatch, label %final_right
+dispatch:
+ %c3 = icmp eq i8 %v3, 0
+ br i1 %c3, label %final_left, label %final_right
+final_left:
+ call void @sideeffect0()
+ ret void
+final_right:
+ call void @sideeffect1()
+ ret void
+}
+
+; More complex case, there's an extra op that is safe to execute unconditionally.
+
+define void @one_pred_with_extra_op(i8 %v0, i8 %v1) {
+; CHECK-LABEL: @one_pred_with_extra_op(
+; CHECK-NEXT: pred:
+; CHECK-NEXT: [[C0:%.*]] = icmp eq i8 [[V0:%.*]], 0
+; CHECK-NEXT: [[V1_ADJ:%.*]] = add i8 [[V0]], [[V1:%.*]]
+; CHECK-NEXT: [[C1:%.*]] = icmp eq i8 [[V1_ADJ]], 0
+; CHECK-NEXT: [[OR_COND:%.*]] = and i1 [[C0]], [[C1]]
+; CHECK-NEXT: br i1 [[OR_COND]], label [[FINAL_LEFT:%.*]], label [[FINAL_RIGHT:%.*]]
+; CHECK: final_left:
+; CHECK-NEXT: call void @sideeffect0()
+; CHECK-NEXT: ret void
+; CHECK: final_right:
+; CHECK-NEXT: call void @sideeffect1()
+; CHECK-NEXT: ret void
+;
+pred:
+ %c0 = icmp eq i8 %v0, 0
+ br i1 %c0, label %dispatch, label %final_right
+dispatch:
+ %v1_adj = add i8 %v0, %v1
+ %c1 = icmp eq i8 %v1_adj, 0
+ br i1 %c1, label %final_left, label %final_right
+final_left:
+ call void @sideeffect0()
+ ret void
+final_right:
+ call void @sideeffect1()
+ ret void
+}
+
+define void @two_preds_with_extra_op(i8 %v0, i8 %v1, i8 %v2, i8 %v3) {
+; CHECK-LABEL: @two_preds_with_extra_op(
+; CHECK-NEXT: entry:
+; CHECK-NEXT: [[C0:%.*]] = icmp eq i8 [[V0:%.*]], 0
+; CHECK-NEXT: br i1 [[C0]], label [[PRED0:%.*]], label [[PRED1:%.*]]
+; CHECK: pred0:
+; CHECK-NEXT: [[C1:%.*]] = icmp eq i8 [[V1:%.*]], 0
+; CHECK-NEXT: [[DOTOLD:%.*]] = add i8 [[V1]], [[V2:%.*]]
+; CHECK-NEXT: [[C3_OLD:%.*]] = icmp eq i8 [[DOTOLD]], 0
+; CHECK-NEXT: [[OR_COND2:%.*]] = or i1 [[C1]], [[C3_OLD]]
+; CHECK-NEXT: br i1 [[OR_COND2]], label [[FINAL_LEFT:%.*]], label [[FINAL_RIGHT:%.*]]
+; CHECK: pred1:
+; CHECK-NEXT: [[C2:%.*]] = icmp eq i8 [[V2]], 0
+; CHECK-NEXT: [[V3_ADJ:%.*]] = add i8 [[V1]], [[V2]]
+; CHECK-NEXT: [[C3:%.*]] = icmp eq i8 [[V3_ADJ]], 0
+; CHECK-NEXT: [[OR_COND:%.*]] = and i1 [[C2]], [[C3]]
+; CHECK-NEXT: br i1 [[OR_COND]], label [[FINAL_LEFT]], label [[FINAL_RIGHT]]
+; CHECK: final_left:
+; CHECK-NEXT: call void @sideeffect0()
+; CHECK-NEXT: ret void
+; CHECK: final_right:
+; CHECK-NEXT: call void @sideeffect1()
+; CHECK-NEXT: ret void
+;
+entry:
+ %c0 = icmp eq i8 %v0, 0
+ br i1 %c0, label %pred0, label %pred1
+pred0:
+ %c1 = icmp eq i8 %v1, 0
+ br i1 %c1, label %final_left, label %dispatch
+pred1:
+ %c2 = icmp eq i8 %v2, 0
+ br i1 %c2, label %dispatch, label %final_right
+dispatch:
+ %v3_adj = add i8 %v1, %v2
+ %c3 = icmp eq i8 %v3_adj, 0
+ br i1 %c3, label %final_left, label %final_right
+final_left:
+ call void @sideeffect0()
+ ret void
+final_right:
+ call void @sideeffect1()
+ ret void
+}
+
+; More complex case, there's an extra op that is safe to execute unconditionally, and it has multiple uses.
+
+define void @one_pred_with_extra_op_multiuse(i8 %v0, i8 %v1) {
+; CHECK-LABEL: @one_pred_with_extra_op_multiuse(
+; CHECK-NEXT: pred:
+; CHECK-NEXT: [[C0:%.*]] = icmp eq i8 [[V0:%.*]], 0
+; CHECK-NEXT: br i1 [[C0]], label [[DISPATCH:%.*]], label [[FINAL_RIGHT:%.*]]
+; CHECK: dispatch:
+; CHECK-NEXT: [[V1_ADJ:%.*]] = add i8 [[V0]], [[V1:%.*]]
+; CHECK-NEXT: [[V1_ADJ_ADJ:%.*]] = add i8 [[V1_ADJ]], [[V1_ADJ]]
+; CHECK-NEXT: [[C1:%.*]] = icmp eq i8 [[V1_ADJ_ADJ]], 0
+; CHECK-NEXT: br i1 [[C1]], label [[FINAL_LEFT:%.*]], label [[FINAL_RIGHT]]
+; CHECK: final_left:
+; CHECK-NEXT: call void @sideeffect0()
+; CHECK-NEXT: ret void
+; CHECK: final_right:
+; CHECK-NEXT: call void @sideeffect1()
+; CHECK-NEXT: ret void
+;
+pred:
+ %c0 = icmp eq i8 %v0, 0
+ br i1 %c0, label %dispatch, label %final_right
+dispatch:
+ %v1_adj = add i8 %v0, %v1
+ %v1_adj_adj = add i8 %v1_adj, %v1_adj
+ %c1 = icmp eq i8 %v1_adj_adj, 0
+ br i1 %c1, label %final_left, label %final_right
+final_left:
+ call void @sideeffect0()
+ ret void
+final_right:
+ call void @sideeffect1()
+ ret void
+}
+
+define void @two_preds_with_extra_op_multiuse(i8 %v0, i8 %v1, i8 %v2, i8 %v3) {
+; CHECK-LABEL: @two_preds_with_extra_op_multiuse(
+; CHECK-NEXT: entry:
+; CHECK-NEXT: [[C0:%.*]] = icmp eq i8 [[V0:%.*]], 0
+; CHECK-NEXT: br i1 [[C0]], label [[PRED0:%.*]], label [[PRED1:%.*]]
+; CHECK: pred0:
+; CHECK-NEXT: [[C1:%.*]] = icmp eq i8 [[V1:%.*]], 0
+; CHECK-NEXT: br i1 [[C1]], label [[FINAL_LEFT:%.*]], label [[DISPATCH:%.*]]
+; CHECK: pred1:
+; CHECK-NEXT: [[C2:%.*]] = icmp eq i8 [[V2:%.*]], 0
+; CHECK-NEXT: br i1 [[C2]], label [[DISPATCH]], label [[FINAL_RIGHT:%.*]]
+; CHECK: dispatch:
+; CHECK-NEXT: [[V3_ADJ:%.*]] = add i8 [[V1]], [[V2]]
+; CHECK-NEXT: [[V3_ADJ_ADJ:%.*]] = add i8 [[V3_ADJ]], [[V3_ADJ]]
+; CHECK-NEXT: [[C3:%.*]] = icmp eq i8 [[V3_ADJ_ADJ]], 0
+; CHECK-NEXT: br i1 [[C3]], label [[FINAL_LEFT]], label [[FINAL_RIGHT]]
+; CHECK: final_left:
+; CHECK-NEXT: call void @sideeffect0()
+; CHECK-NEXT: ret void
+; CHECK: final_right:
+; CHECK-NEXT: call void @sideeffect1()
+; CHECK-NEXT: ret void
+;
+entry:
+ %c0 = icmp eq i8 %v0, 0
+ br i1 %c0, label %pred0, label %pred1
+pred0:
+ %c1 = icmp eq i8 %v1, 0
+ br i1 %c1, label %final_left, label %dispatch
+pred1:
+ %c2 = icmp eq i8 %v2, 0
+ br i1 %c2, label %dispatch, label %final_right
+dispatch:
+ %v3_adj = add i8 %v1, %v2
+ %v3_adj_adj = add i8 %v3_adj, %v3_adj
+ %c3 = icmp eq i8 %v3_adj_adj, 0
+ br i1 %c3, label %final_left, label %final_right
+final_left:
+ call void @sideeffect0()
+ ret void
+final_right:
+ call void @sideeffect1()
+ ret void
+}
+
+; More complex case, there's an op that is safe to execute unconditionally,
+; and said op is live-out.
+
+define void @one_pred_with_extra_op_liveout(i8 %v0, i8 %v1) {
+; CHECK-LABEL: @one_pred_with_extra_op_liveout(
+; CHECK-NEXT: pred:
+; CHECK-NEXT: [[C0:%.*]] = icmp eq i8 [[V0:%.*]], 0
+; CHECK-NEXT: br i1 [[C0]], label [[DISPATCH:%.*]], label [[FINAL_RIGHT:%.*]]
+; CHECK: dispatch:
+; CHECK-NEXT: [[V1_ADJ:%.*]] = add i8 [[V0]], [[V1:%.*]]
+; CHECK-NEXT: [[C1:%.*]] = icmp eq i8 [[V1_ADJ]], 0
+; CHECK-NEXT: br i1 [[C1]], label [[FINAL_LEFT:%.*]], label [[FINAL_RIGHT]]
+; CHECK: final_left:
+; CHECK-NEXT: call void @sideeffect0()
+; CHECK-NEXT: call void @use8(i8 [[V1_ADJ]])
+; CHECK-NEXT: ret void
+; CHECK: final_right:
+; CHECK-NEXT: call void @sideeffect1()
+; CHECK-NEXT: ret void
+;
+pred:
+ %c0 = icmp eq i8 %v0, 0
+ br i1 %c0, label %dispatch, label %final_right
+dispatch:
+ %v1_adj = add i8 %v0, %v1
+ %c1 = icmp eq i8 %v1_adj, 0
+ br i1 %c1, label %final_left, label %final_right
+final_left:
+ call void @sideeffect0()
+ call void @use8(i8 %v1_adj)
+ ret void
+final_right:
+ call void @sideeffect1()
+ ret void
+}
+define void @one_pred_with_extra_op_liveout_multiuse(i8 %v0, i8 %v1) {
+; CHECK-LABEL: @one_pred_with_extra_op_liveout_multiuse(
+; CHECK-NEXT: pred:
+; CHECK-NEXT: [[C0:%.*]] = icmp eq i8 [[V0:%.*]], 0
+; CHECK-NEXT: br i1 [[C0]], label [[DISPATCH:%.*]], label [[FINAL_RIGHT:%.*]]
+; CHECK: dispatch:
+; CHECK-NEXT: [[V1_ADJ:%.*]] = add i8 [[V0]], [[V1:%.*]]
+; CHECK-NEXT: [[C1:%.*]] = icmp eq i8 [[V1_ADJ]], 0
+; CHECK-NEXT: br i1 [[C1]], label [[FINAL_LEFT:%.*]], label [[FINAL_RIGHT]]
+; CHECK: final_left:
+; CHECK-NEXT: call void @sideeffect0()
+; CHECK-NEXT: call void @use8(i8 [[V1_ADJ]])
+; CHECK-NEXT: call void @use8(i8 [[V1_ADJ]])
+; CHECK-NEXT: ret void
+; CHECK: final_right:
+; CHECK-NEXT: call void @sideeffect1()
+; CHECK-NEXT: ret void
+;
+pred:
+ %c0 = icmp eq i8 %v0, 0
+ br i1 %c0, label %dispatch, label %final_right
+dispatch:
+ %v1_adj = add i8 %v0, %v1
+ %c1 = icmp eq i8 %v1_adj, 0
+ br i1 %c1, label %final_left, label %final_right
+final_left:
+ call void @sideeffect0()
+ call void @use8(i8 %v1_adj)
+ call void @use8(i8 %v1_adj)
+ ret void
+final_right:
+ call void @sideeffect1()
+ 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:
+; CHECK-NEXT: [[C0:%.*]] = icmp eq i8 [[V0:%.*]], 0
+; CHECK-NEXT: br i1 [[C0]], label [[PRED0:%.*]], label [[PRED1:%.*]]
+; CHECK: pred0:
+; CHECK-NEXT: [[C1:%.*]] = icmp eq i8 [[V1:%.*]], 0
+; CHECK-NEXT: br i1 [[C1]], label [[FINAL_LEFT:%.*]], label [[DISPATCH:%.*]]
+; CHECK: pred1:
+; CHECK-NEXT: [[C2:%.*]] = icmp eq i8 [[V2:%.*]], 0
+; CHECK-NEXT: br i1 [[C2]], label [[DISPATCH]], label [[FINAL_RIGHT:%.*]]
+; CHECK: dispatch:
+; CHECK-NEXT: [[V3_ADJ:%.*]] = add i8 [[V1]], [[V2]]
+; CHECK-NEXT: [[C3:%.*]] = icmp eq i8 [[V3_ADJ]], 0
+; CHECK-NEXT: br i1 [[C3]], label [[FINAL_LEFT]], label [[FINAL_RIGHT]]
+; CHECK: final_left:
+; CHECK-NEXT: [[MERGE_LEFT:%.*]] = phi i8 [ [[V3_ADJ]], [[DISPATCH]] ], [ 0, [[PRED0]] ]
+; CHECK-NEXT: call void @use8(i8 [[MERGE_LEFT]])
+; CHECK-NEXT: call void @sideeffect0()
+; CHECK-NEXT: ret void
+; CHECK: final_right:
+; CHECK-NEXT: call void @sideeffect1()
+; CHECK-NEXT: ret void
+;
+entry:
+ %c0 = icmp eq i8 %v0, 0
+ br i1 %c0, label %pred0, label %pred1
+pred0:
+ %c1 = icmp eq i8 %v1, 0
+ br i1 %c1, label %final_left, label %dispatch
+pred1:
+ %c2 = icmp eq i8 %v2, 0
+ br i1 %c2, label %dispatch, label %final_right
+dispatch:
+ %v3_adj = add i8 %v1, %v2
+ %c3 = icmp eq i8 %v3_adj, 0
+ br i1 %c3, label %final_left, label %final_right
+final_left:
+ %merge_left = phi i8 [ %v3_adj, %dispatch ], [ 0, %pred0 ]
+ call void @use8(i8 %merge_left)
+ call void @sideeffect0()
+ ret void
+final_right:
+ call void @sideeffect1()
+ ret void
+}
+
+define void @two_preds_with_extra_op_liveout_multiuse(i8 %v0, i8 %v1, i8 %v2, i8 %v3) {
+; CHECK-LABEL: @two_preds_with_extra_op_liveout_multiuse(
+; CHECK-NEXT: entry:
+; CHECK-NEXT: [[C0:%.*]] = icmp eq i8 [[V0:%.*]], 0
+; CHECK-NEXT: br i1 [[C0]], label [[PRED0:%.*]], label [[PRED1:%.*]]
+; CHECK: pred0:
+; CHECK-NEXT: [[C1:%.*]] = icmp eq i8 [[V1:%.*]], 0
+; CHECK-NEXT: br i1 [[C1]], label [[FINAL_LEFT:%.*]], label [[DISPATCH:%.*]]
+; CHECK: pred1:
+; CHECK-NEXT: [[C2:%.*]] = icmp eq i8 [[V2:%.*]], 0
+; CHECK-NEXT: br i1 [[C2]], label [[DISPATCH]], label [[FINAL_RIGHT:%.*]]
+; CHECK: dispatch:
+; CHECK-NEXT: [[V3_ADJ:%.*]] = add i8 [[V1]], [[V2]]
+; CHECK-NEXT: [[C3:%.*]] = icmp eq i8 [[V3_ADJ]], 0
+; CHECK-NEXT: br i1 [[C3]], label [[FINAL_LEFT]], label [[FINAL_RIGHT]]
+; CHECK: final_left:
+; CHECK-NEXT: [[MERGE_LEFT:%.*]] = phi i8 [ [[V3_ADJ]], [[DISPATCH]] ], [ 0, [[PRED0]] ]
+; CHECK-NEXT: [[MERGE_LEFT_2:%.*]] = phi i8 [ [[V3_ADJ]], [[DISPATCH]] ], [ 42, [[PRED0]] ]
+; CHECK-NEXT: call void @use8(i8 [[MERGE_LEFT]])
+; CHECK-NEXT: call void @use8(i8 [[MERGE_LEFT_2]])
+; CHECK-NEXT: call void @sideeffect0()
+; CHECK-NEXT: ret void
+; CHECK: final_right:
+; CHECK-NEXT: call void @sideeffect1()
+; CHECK-NEXT: ret void
+;
+entry:
+ %c0 = icmp eq i8 %v0, 0
+ br i1 %c0, label %pred0, label %pred1
+pred0:
+ %c1 = icmp eq i8 %v1, 0
+ br i1 %c1, label %final_left, label %dispatch
+pred1:
+ %c2 = icmp eq i8 %v2, 0
+ br i1 %c2, label %dispatch, label %final_right
+dispatch:
+ %v3_adj = add i8 %v1, %v2
+ %c3 = icmp eq i8 %v3_adj, 0
+ br i1 %c3, label %final_left, label %final_right
+final_left:
+ %merge_left = phi i8 [ %v3_adj, %dispatch ], [ 0, %pred0 ]
+ %merge_left_2 = phi i8 [ %v3_adj, %dispatch ], [ 42, %pred0 ]
+ call void @use8(i8 %merge_left)
+ call void @use8(i8 %merge_left_2)
+ call void @sideeffect0()
+ ret void
+final_right:
+ call void @sideeffect1()
+ ret void
+}
+
+; More complex case, there's an op that is safe to execute unconditionally,
+; and said op is live-out, and it is only used externally.
+
+define void @one_pred_with_extra_op_eexternally_used_only(i8 %v0, i8 %v1) {
+; CHECK-LABEL: @one_pred_with_extra_op_eexternally_used_only(
+; CHECK-NEXT: pred:
+; CHECK-NEXT: [[C0:%.*]] = icmp eq i8 [[V0:%.*]], 0
+; CHECK-NEXT: br i1 [[C0]], label [[DISPATCH:%.*]], label [[FINAL_RIGHT:%.*]]
+; CHECK: dispatch:
+; CHECK-NEXT: [[V1_ADJ:%.*]] = add i8 [[V0]], [[V1:%.*]]
+; CHECK-NEXT: [[C1:%.*]] = icmp eq i8 [[V1]], 0
+; CHECK-NEXT: br i1 [[C1]], label [[FINAL_LEFT:%.*]], label [[FINAL_RIGHT]]
+; CHECK: final_left:
+; CHECK-NEXT: call void @sideeffect0()
+; CHECK-NEXT: call void @use8(i8 [[V1_ADJ]])
+; CHECK-NEXT: ret void
+; CHECK: final_right:
+; CHECK-NEXT: call void @sideeffect1()
+; CHECK-NEXT: ret void
+;
+pred:
+ %c0 = icmp eq i8 %v0, 0
+ br i1 %c0, label %dispatch, label %final_right
+dispatch:
+ %v1_adj = add i8 %v0, %v1
+ %c1 = icmp eq i8 %v1, 0
+ br i1 %c1, label %final_left, label %final_right
+final_left:
+ call void @sideeffect0()
+ call void @use8(i8 %v1_adj)
+ ret void
+final_right:
+ call void @sideeffect1()
+ ret void
+}
+define void @one_pred_with_extra_op_externally_used_only_multiuse(i8 %v0, i8 %v1) {
+; CHECK-LABEL: @one_pred_with_extra_op_externally_used_only_multiuse(
+; CHECK-NEXT: pred:
+; CHECK-NEXT: [[C0:%.*]] = icmp eq i8 [[V0:%.*]], 0
+; CHECK-NEXT: br i1 [[C0]], label [[DISPATCH:%.*]], label [[FINAL_RIGHT:%.*]]
+; CHECK: dispatch:
+; CHECK-NEXT: [[V1_ADJ:%.*]] = add i8 [[V0]], [[V1:%.*]]
+; CHECK-NEXT: [[C1:%.*]] = icmp eq i8 [[V1]], 0
+; CHECK-NEXT: br i1 [[C1]], label [[FINAL_LEFT:%.*]], label [[FINAL_RIGHT]]
+; CHECK: final_left:
+; CHECK-NEXT: call void @sideeffect0()
+; CHECK-NEXT: call void @use8(i8 [[V1_ADJ]])
+; CHECK-NEXT: call void @use8(i8 [[V1_ADJ]])
+; CHECK-NEXT: ret void
+; CHECK: final_right:
+; CHECK-NEXT: call void @sideeffect1()
+; CHECK-NEXT: ret void
+;
+pred:
+ %c0 = icmp eq i8 %v0, 0
+ br i1 %c0, label %dispatch, label %final_right
+dispatch:
+ %v1_adj = add i8 %v0, %v1
+ %c1 = icmp eq i8 %v1, 0
+ br i1 %c1, label %final_left, label %final_right
+final_left:
+ call void @sideeffect0()
+ call void @use8(i8 %v1_adj)
+ call void @use8(i8 %v1_adj)
+ ret void
+final_right:
+ call void @sideeffect1()
+ ret void
+}
+
+define void @two_preds_with_extra_op_externally_used_only(i8 %v0, i8 %v1, i8 %v2, i8 %v3) {
+; CHECK-LABEL: @two_preds_with_extra_op_externally_used_only(
+; CHECK-NEXT: entry:
+; CHECK-NEXT: [[C0:%.*]] = icmp eq i8 [[V0:%.*]], 0
+; CHECK-NEXT: br i1 [[C0]], label [[PRED0:%.*]], label [[PRED1:%.*]]
+; CHECK: pred0:
+; CHECK-NEXT: [[C1:%.*]] = icmp eq i8 [[V1:%.*]], 0
+; CHECK-NEXT: br i1 [[C1]], label [[FINAL_LEFT:%.*]], label [[DISPATCH:%.*]]
+; CHECK: pred1:
+; CHECK-NEXT: [[C2:%.*]] = icmp eq i8 [[V2:%.*]], 0
+; CHECK-NEXT: br i1 [[C2]], label [[DISPATCH]], label [[FINAL_RIGHT:%.*]]
+; CHECK: dispatch:
+; CHECK-NEXT: [[V3_ADJ:%.*]] = add i8 [[V1]], [[V2]]
+; CHECK-NEXT: [[C3:%.*]] = icmp eq i8 [[V3:%.*]], 0
+; CHECK-NEXT: br i1 [[C3]], label [[FINAL_LEFT]], label [[FINAL_RIGHT]]
+; CHECK: final_left:
+; CHECK-NEXT: [[MERGE_LEFT:%.*]] = phi i8 [ [[V3_ADJ]], [[DISPATCH]] ], [ 0, [[PRED0]] ]
+; CHECK-NEXT: call void @use8(i8 [[MERGE_LEFT]])
+; CHECK-NEXT: call void @sideeffect0()
+; CHECK-NEXT: ret void
+; CHECK: final_right:
+; CHECK-NEXT: call void @sideeffect1()
+; CHECK-NEXT: ret void
+;
+entry:
+ %c0 = icmp eq i8 %v0, 0
+ br i1 %c0, label %pred0, label %pred1
+pred0:
+ %c1 = icmp eq i8 %v1, 0
+ br i1 %c1, label %final_left, label %dispatch
+pred1:
+ %c2 = icmp eq i8 %v2, 0
+ br i1 %c2, label %dispatch, label %final_right
+dispatch:
+ %v3_adj = add i8 %v1, %v2
+ %c3 = icmp eq i8 %v3, 0
+ br i1 %c3, label %final_left, label %final_right
+final_left:
+ %merge_left = phi i8 [ %v3_adj, %dispatch ], [ 0, %pred0 ]
+ call void @use8(i8 %merge_left)
+ call void @sideeffect0()
+ ret void
+final_right:
+ call void @sideeffect1()
+ ret void
+}
+
+define void @two_preds_with_extra_op_externally_used_only_multiuse(i8 %v0, i8 %v1, i8 %v2, i8 %v3) {
+; CHECK-LABEL: @two_preds_with_extra_op_externally_used_only_multiuse(
+; CHECK-NEXT: entry:
+; CHECK-NEXT: [[C0:%.*]] = icmp eq i8 [[V0:%.*]], 0
+; CHECK-NEXT: br i1 [[C0]], label [[PRED0:%.*]], label [[PRED1:%.*]]
+; CHECK: pred0:
+; CHECK-NEXT: [[C1:%.*]] = icmp eq i8 [[V1:%.*]], 0
+; CHECK-NEXT: br i1 [[C1]], label [[FINAL_LEFT:%.*]], label [[DISPATCH:%.*]]
+; CHECK: pred1:
+; CHECK-NEXT: [[C2:%.*]] = icmp eq i8 [[V2:%.*]], 0
+; CHECK-NEXT: br i1 [[C2]], label [[DISPATCH]], label [[FINAL_RIGHT:%.*]]
+; CHECK: dispatch:
+; CHECK-NEXT: [[V3_ADJ:%.*]] = add i8 [[V1]], [[V2]]
+; CHECK-NEXT: [[C3:%.*]] = icmp eq i8 [[V3:%.*]], 0
+; CHECK-NEXT: br i1 [[C3]], label [[FINAL_LEFT]], label [[FINAL_RIGHT]]
+; CHECK: final_left:
+; CHECK-NEXT: [[MERGE_LEFT:%.*]] = phi i8 [ [[V3_ADJ]], [[DISPATCH]] ], [ 0, [[PRED0]] ]
+; CHECK-NEXT: [[MERGE_LEFT_2:%.*]] = phi i8 [ [[V3_ADJ]], [[DISPATCH]] ], [ 42, [[PRED0]] ]
+; CHECK-NEXT: call void @use8(i8 [[MERGE_LEFT]])
+; CHECK-NEXT: call void @use8(i8 [[MERGE_LEFT_2]])
+; CHECK-NEXT: call void @sideeffect0()
+; CHECK-NEXT: ret void
+; CHECK: final_right:
+; CHECK-NEXT: call void @sideeffect1()
+; CHECK-NEXT: ret void
+;
+entry:
+ %c0 = icmp eq i8 %v0, 0
+ br i1 %c0, label %pred0, label %pred1
+pred0:
+ %c1 = icmp eq i8 %v1, 0
+ br i1 %c1, label %final_left, label %dispatch
+pred1:
+ %c2 = icmp eq i8 %v2, 0
+ br i1 %c2, label %dispatch, label %final_right
+dispatch:
+ %v3_adj = add i8 %v1, %v2
+ %c3 = icmp eq i8 %v3, 0
+ br i1 %c3, label %final_left, label %final_right
+final_left:
+ %merge_left = phi i8 [ %v3_adj, %dispatch ], [ 0, %pred0 ]
+ %merge_left_2 = phi i8 [ %v3_adj, %dispatch ], [ 42, %pred0 ]
+ call void @use8(i8 %merge_left)
+ call void @use8(i8 %merge_left_2)
+ call void @sideeffect0()
+ ret void
+final_right:
+ call void @sideeffect1()
+ ret void
+}
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