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68079ef0eb
In particular, it couldn't handle cases where lookup table constant expressions involved bitcasts. This does not seem to come up frequently in C++, but comes up reasonably often in Rust via `#[derive(Debug)]`. Originally reported by pcwalton. Reviewed By: nikic Differential Revision: https://reviews.llvm.org/D109565
43 lines
1.6 KiB
LLVM
43 lines
1.6 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --scrub-attributes
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; RUN: opt -simplifycfg --switch-to-lookup -S < %s | FileCheck %s
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target triple = "x86_64-unknown-linux-gnu"
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@alloc0 = private unnamed_addr constant <{ [1 x i8] }> <{ [1 x i8] c"A" }>, align 1
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@alloc1 = private unnamed_addr constant <{ [1 x i8] }> <{ [1 x i8] c"B" }>, align 1
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@alloc2 = private unnamed_addr constant <{ [1 x i8] }> <{ [1 x i8] c"C" }>, align 1
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define { [0 x i8]*, i64 } @switch_to_lookup_bitcast(i8 %0) unnamed_addr {
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; CHECK-LABEL: @switch_to_lookup_bitcast(
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; CHECK-NEXT: start:
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; CHECK-NEXT: [[SWITCH_GEP:%.*]] = getelementptr inbounds [3 x [0 x i8]*], [3 x [0 x i8]*]* @switch.table.switch_to_lookup_bitcast, i32 0, i8 [[TMP0:%.*]]
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; CHECK-NEXT: [[SWITCH_LOAD:%.*]] = load [0 x i8]*, [0 x i8]** [[SWITCH_GEP]], align 8
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; CHECK-NEXT: [[TMP1:%.*]] = insertvalue { [0 x i8]*, i64 } undef, [0 x i8]* [[SWITCH_LOAD]], 0
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; CHECK-NEXT: [[TMP2:%.*]] = insertvalue { [0 x i8]*, i64 } [[TMP1]], i64 1, 1
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; CHECK-NEXT: ret { [0 x i8]*, i64 } [[TMP2]]
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;
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start:
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switch i8 %0, label %default [
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i8 0, label %bb0
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i8 1, label %bb1
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i8 2, label %bb2
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]
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bb0:
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br label %end
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bb1:
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br label %end
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bb2:
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br label %end
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default:
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unreachable
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end:
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%.sroa.0.0 = phi [0 x i8]* [ bitcast (<{ [1 x i8] }>* @alloc0 to [0 x i8]*), %bb0 ], [ bitcast (<{ [1 x i8] }>* @alloc1 to [0 x i8]*), %bb1 ], [ bitcast (<{ [1 x i8] }>* @alloc2 to [0 x i8]*), %bb2 ]
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%1 = insertvalue { [0 x i8]*, i64 } undef, [0 x i8]* %.sroa.0.0, 0
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%2 = insertvalue { [0 x i8]*, i64 } %1, i64 1, 1
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ret { [0 x i8]*, i64 } %2
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}
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