78 lines
1.4 KiB
LLVM
78 lines
1.4 KiB
LLVM
; 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: x.off = add i32 %x, -5
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; CHECK: %switch = icmp ult i32 %x.off, 3
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; CHECK: br i1 %switch, label %a, label %default
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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: x.off = add i32 %x, -5
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; CHECK: %switch = icmp ult i32 %x.off, 3
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; CHECK: br i1 %switch, label %a, label %b
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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: x.off = add i32 %x, -5
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; CHECK: %switch = icmp ult i32 %x.off, 3
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; CHECK: br i1 %switch, label %a, label %b
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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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