13ffde316a
Remove compares after replacing all uses. Cleaning dead compares can enable additional simplifications when adjusting the position of the pass slightly. In particular, it seems like the additional dead instructions may prevent SimplifyCFG performing some folds. Reviewed By: nikic Differential Revision: https://reviews.llvm.org/D158760
85 lines
2.9 KiB
LLVM
85 lines
2.9 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt -passes=constraint-elimination -S %s | FileCheck %s
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; The system for the function below grows quite large. Check to make sure
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; we can handle that scenario.
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define void @test(i64 %x, ptr %y, ptr %z, ptr %w) {
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; CHECK-LABEL: @test(
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; CHECK-NEXT: [[TMP22:%.*]] = getelementptr inbounds i8, ptr [[Y:%.*]], i64 [[X:%.*]]
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; CHECK-NEXT: [[TMP26:%.*]] = icmp ult ptr [[TMP22]], [[Z:%.*]]
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; CHECK-NEXT: br i1 [[TMP26]], label [[BB28:%.*]], label [[EARLY_EXIT:%.*]]
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; CHECK: early.exit:
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; CHECK-NEXT: unreachable
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; CHECK: bb28:
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; CHECK-NEXT: [[TMP29:%.*]] = getelementptr inbounds i8, ptr [[Y]], i64 [[X]]
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; CHECK-NEXT: [[TMP30:%.*]] = icmp ult ptr [[TMP29]], [[Z]]
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; CHECK-NEXT: br i1 [[TMP30]], label [[EARLY_EXIT]], label [[BB32:%.*]]
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; CHECK: bb32:
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; CHECK-NEXT: [[TMP33:%.*]] = icmp ult ptr [[TMP29]], [[Z]]
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; CHECK-NEXT: br i1 [[TMP33]], label [[BB35:%.*]], label [[EARLY_EXIT]]
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; CHECK: bb35:
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; CHECK-NEXT: [[TMP36:%.*]] = icmp ult ptr [[Y]], [[Z]]
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; CHECK-NEXT: br i1 [[TMP36]], label [[EARLY_EXIT]], label [[BB38:%.*]]
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; CHECK: bb38:
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; CHECK-NEXT: br i1 false, label [[EARLY_EXIT]], label [[BB43:%.*]]
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; CHECK: bb43:
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; CHECK-NEXT: [[TMP47:%.*]] = getelementptr inbounds i8, ptr [[W:%.*]], i64 [[X]]
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; CHECK-NEXT: [[TMP48:%.*]] = icmp ult ptr [[TMP47]], [[Y]]
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; CHECK-NEXT: br i1 [[TMP48]], label [[EARLY_EXIT]], label [[BB50:%.*]]
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; CHECK: bb50:
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; CHECK-NEXT: [[TMP52:%.*]] = getelementptr inbounds i8, ptr [[W]], i64 [[X]]
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; CHECK-NEXT: [[TMP53:%.*]] = icmp ult ptr [[TMP52]], [[Y]]
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; CHECK-NEXT: br i1 [[TMP53]], label [[EARLY_EXIT]], label [[BB55:%.*]]
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; CHECK: bb55:
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; CHECK-NEXT: [[TMP57:%.*]] = icmp ult ptr [[W]], [[Y]]
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; CHECK-NEXT: br i1 [[TMP57]], label [[BB59:%.*]], label [[EARLY_EXIT]]
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; CHECK: bb59:
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; CHECK-NEXT: call void @use(i1 true)
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; CHECK-NEXT: ret void
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;
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%tmp22 = getelementptr inbounds i8, ptr %y, i64 %x
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%tmp26 = icmp ult ptr %tmp22, %z
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br i1 %tmp26, label %bb28, label %early.exit
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early.exit:
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unreachable
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bb28:
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%tmp29 = getelementptr inbounds i8, ptr %y, i64 %x
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%tmp30 = icmp ult ptr %tmp29, %z
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br i1 %tmp30, label %early.exit, label %bb32
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bb32:
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%tmp33 = icmp ult ptr %tmp29, %z
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br i1 %tmp33, label %bb35, label %early.exit
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bb35:
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%tmp36 = icmp ult ptr %y, %z
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br i1 %tmp36, label %early.exit, label %bb38
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bb38:
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%tmp41 = icmp ult ptr %y, %z
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br i1 %tmp41, label %early.exit, label %bb43
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bb43:
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%tmp47 = getelementptr inbounds i8, ptr %w, i64 %x
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%tmp48 = icmp ult ptr %tmp47, %y
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br i1 %tmp48, label %early.exit, label %bb50
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bb50:
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%tmp52 = getelementptr inbounds i8, ptr %w, i64 %x
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%tmp53 = icmp ult ptr %tmp52, %y
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br i1 %tmp53, label %early.exit, label %bb55
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bb55:
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%tmp57 = icmp ult ptr %w, %y
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br i1 %tmp57, label %bb59, label %early.exit
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bb59:
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%tmp60 = icmp ult ptr %w, %y
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call void @use(i1 %tmp60)
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ret void
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}
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declare void @use(i1)
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