diff options
Diffstat (limited to 'llvm/test/Transforms/SimplifyCFG/switch_create.ll')
| -rw-r--r-- | llvm/test/Transforms/SimplifyCFG/switch_create.ll | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/llvm/test/Transforms/SimplifyCFG/switch_create.ll b/llvm/test/Transforms/SimplifyCFG/switch_create.ll index 75498faaa29..29d3a34a05e 100644 --- a/llvm/test/Transforms/SimplifyCFG/switch_create.ll +++ b/llvm/test/Transforms/SimplifyCFG/switch_create.ll @@ -618,4 +618,43 @@ if: else: ret void +} + +; Form a switch when or'ing a power of two +; CHECK-LABEL: define void @test21 +; CHECK: i32 32, label %else +; CHECK: i32 13, label %else +; CHECK: i32 12, label %else +define void @test21(i32 %arg) { + %and = or i32 %arg, 1 + %cmp1 = icmp ne i32 %and, 13 + %cmp2 = icmp ne i32 %arg, 32 + %pred = and i1 %cmp1, %cmp2 + br i1 %pred, label %if, label %else + +if: + call void @foo1() + ret void + +else: + ret void +} + +; Since %cmp1 is always false, a switch is never formed +; CHECK-LABEL: define void @test22 +; CHECK-NOT: switch +; CHECK: ret void +define void @test22(i32 %arg) { + %and = or i32 %arg, 1 + %cmp1 = icmp ne i32 %and, 12 + %cmp2 = icmp ne i32 %arg, 32 + %pred = and i1 %cmp1, %cmp2 + br i1 %pred, label %if, label %else + +if: + call void @foo1() + ret void + +else: + ret void }
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