forked from OSchip/llvm-project
141 lines
3.1 KiB
LLVM
141 lines
3.1 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt %s -simplifycfg -S | FileCheck %s
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declare i32 @f(i32)
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define i32 @basic(i32 %x) {
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; CHECK-LABEL: @basic(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[X_OFF:%.*]] = add i32 [[X:%.*]], -5
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; CHECK-NEXT: [[SWITCH:%.*]] = icmp ult i32 [[X_OFF]], 3
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; CHECK-NEXT: br i1 [[SWITCH]], label [[A:%.*]], label [[DEFAULT:%.*]]
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; CHECK: default:
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; CHECK-NEXT: [[TMP0:%.*]] = call i32 @f(i32 0)
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; CHECK-NEXT: ret i32 [[TMP0]]
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; CHECK: a:
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; CHECK-NEXT: [[TMP1:%.*]] = call i32 @f(i32 1)
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; CHECK-NEXT: ret i32 [[TMP1]]
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;
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entry:
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switch i32 %x, label %default [
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i32 5, label %a
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i32 6, label %a
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i32 7, label %a
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]
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default:
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%0 = call i32 @f(i32 0)
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ret i32 %0
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a:
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%1 = call i32 @f(i32 1)
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ret i32 %1
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}
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define i32 @unreachable(i32 %x) {
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; CHECK-LABEL: @unreachable(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[X_OFF:%.*]] = add i32 [[X:%.*]], -5
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; CHECK-NEXT: [[SWITCH:%.*]] = icmp ult i32 [[X_OFF]], 3
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; CHECK-NEXT: br i1 [[SWITCH]], label [[A:%.*]], label [[B:%.*]]
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; CHECK: a:
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; CHECK-NEXT: [[TMP0:%.*]] = call i32 @f(i32 0)
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; CHECK-NEXT: ret i32 [[TMP0]]
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; CHECK: b:
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; CHECK-NEXT: [[TMP1:%.*]] = call i32 @f(i32 1)
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; CHECK-NEXT: ret i32 [[TMP1]]
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;
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entry:
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switch i32 %x, label %unreachable [
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i32 5, label %a
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i32 6, label %a
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i32 7, label %a
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i32 10, label %b
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i32 20, label %b
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i32 30, label %b
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i32 40, label %b
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]
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unreachable:
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unreachable
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a:
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%0 = call i32 @f(i32 0)
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ret i32 %0
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b:
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%1 = call i32 @f(i32 1)
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ret i32 %1
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}
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define i32 @unreachable2(i32 %x) {
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; CHECK-LABEL: @unreachable2(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[X_OFF:%.*]] = add i32 [[X:%.*]], -5
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; CHECK-NEXT: [[SWITCH:%.*]] = icmp ult i32 [[X_OFF]], 3
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; CHECK-NEXT: br i1 [[SWITCH]], label [[A:%.*]], label [[B:%.*]]
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; CHECK: a:
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; CHECK-NEXT: [[TMP0:%.*]] = call i32 @f(i32 0)
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; CHECK-NEXT: ret i32 [[TMP0]]
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; CHECK: b:
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; CHECK-NEXT: [[TMP1:%.*]] = call i32 @f(i32 1)
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; CHECK-NEXT: ret i32 [[TMP1]]
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;
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entry:
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; Note: folding the most popular case destination into the default
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; would prevent switch-to-icmp here.
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switch i32 %x, label %unreachable [
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i32 5, label %a
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i32 6, label %a
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i32 7, label %a
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i32 10, label %b
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i32 20, label %b
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]
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unreachable:
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unreachable
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a:
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%0 = call i32 @f(i32 0)
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ret i32 %0
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b:
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%1 = call i32 @f(i32 1)
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ret i32 %1
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}
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; This would crash because we did not clean up the
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; default block of the switch before removing the switch.
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define void @PR42737(i32* %a, i1 %c) {
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; CHECK-LABEL: @PR42737(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[TMP0:%.*]] = xor i1 [[C:%.*]], true
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; CHECK-NEXT: call void @llvm.assume(i1 [[TMP0]])
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; CHECK-NEXT: unreachable
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;
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entry:
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br i1 %c, label %switch, label %else
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else:
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store i32 2, i32* %a
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br label %switch
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switch:
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%cleanup.dest1 = phi i32 [ 0, %else ], [ 3, %entry ]
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switch i32 %cleanup.dest1, label %unreach1 [
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i32 0, label %cleanup1
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i32 3, label %cleanup2
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]
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cleanup1:
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br label %unreach2
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cleanup2:
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br label %unreach2
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unreach1:
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%phi2 = phi i32 [ %cleanup.dest1, %switch ]
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unreachable
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unreach2:
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unreachable
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}
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