45 lines
670 B
LLVM
45 lines
670 B
LLVM
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; RUN: opt < %s -lowerswitch -S | FileCheck %s
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;
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; The switch is lowered with a single icmp.
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; CHECK: icmp
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; CHECK-NOT: icmp
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;
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;int foo(int a) {
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;
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; switch (a) {
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; case 0:
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; return 10;
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; case 1:
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; return 3;
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; default:
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; __builtin_unreachable();
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; }
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;
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;}
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define i32 @foo(i32 %a) {
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%1 = alloca i32, align 4
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%2 = alloca i32, align 4
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store i32 %a, i32* %2, align 4
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%3 = load i32, i32* %2, align 4
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switch i32 %3, label %6 [
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i32 0, label %4
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i32 1, label %5
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]
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; <label>:4
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store i32 10, i32* %1
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br label %7
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; <label>:5
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store i32 3, i32* %1
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br label %7
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; <label>:6
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unreachable
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; <label>:7
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%8 = load i32, i32* %1
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ret i32 %8
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}
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