diff options
Diffstat (limited to 'test/Transforms/SimplifyCFG')
| -rw-r--r-- | test/Transforms/SimplifyCFG/X86/switch_to_lookup_table.ll | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/test/Transforms/SimplifyCFG/X86/switch_to_lookup_table.ll b/test/Transforms/SimplifyCFG/X86/switch_to_lookup_table.ll index 4ac02dbdf3..b47fa02af2 100644 --- a/test/Transforms/SimplifyCFG/X86/switch_to_lookup_table.ll +++ b/test/Transforms/SimplifyCFG/X86/switch_to_lookup_table.ll @@ -856,3 +856,39 @@ return: ; CHECK-NOT: @switch.table ; CHECK: switch i32 } + +; We build lookup tables for switches with three or more cases. +define i32 @threecases(i32 %c) { +entry: + switch i32 %c, label %sw.default [ + i32 0, label %return + i32 1, label %sw.bb1 + i32 2, label %sw.bb2 + ] +sw.bb1: br label %return +sw.bb2: br label %return +sw.default: br label %return +return: + %x = phi i32 [ 3, %sw.default ], [ 5, %sw.bb2 ], [ 7, %sw.bb1 ], [ 9, %entry ] + ret i32 %x +; CHECK-LABEL: @threecases( +; CHECK-NOT: switch i32 +; CHECK: @switch.table +} + +; We don't build tables for switches with two cases. +define i32 @twocases(i32 %c) { +entry: + switch i32 %c, label %sw.default [ + i32 0, label %return + i32 1, label %sw.bb1 + ] +sw.bb1: br label %return +sw.default: br label %return +return: + %x = phi i32 [ 3, %sw.default ], [ 7, %sw.bb1 ], [ 9, %entry ] + ret i32 %x +; CHECK-LABEL: @twocases( +; CHECK: switch i32 +; CHECK-NOT: @switch.table +} |