76 lines
2.6 KiB
LLVM
76 lines
2.6 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt < %s -simplifycfg -simplifycfg-require-and-preserve-domtree=1 -switch-to-lookup -S -mtriple=x86_64-unknown-linux-gnu | FileCheck %s
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; RUN: opt < %s -passes='simplify-cfg<switch-to-lookup>' -S -mtriple=x86_64-unknown-linux-gnu | FileCheck %s
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; In the presence of "-no-jump-tables"="true", simplifycfg should not convert switches to lookup tables.
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define i32 @foo(i32 %c) "no-jump-tables"="true" {
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; CHECK-LABEL: @foo(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: switch i32 [[C:%.*]], label [[SW_DEFAULT:%.*]] [
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; CHECK-NEXT: i32 42, label [[RETURN:%.*]]
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; CHECK-NEXT: i32 43, label [[SW_BB1:%.*]]
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; CHECK-NEXT: i32 44, label [[SW_BB2:%.*]]
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; CHECK-NEXT: i32 45, label [[SW_BB3:%.*]]
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; CHECK-NEXT: ]
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; CHECK: sw.bb1:
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; CHECK-NEXT: br label [[RETURN]]
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; CHECK: sw.bb2:
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; CHECK-NEXT: br label [[RETURN]]
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; CHECK: sw.bb3:
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; CHECK-NEXT: br label [[RETURN]]
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; CHECK: sw.default:
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; CHECK-NEXT: br label [[RETURN]]
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; CHECK: return:
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; CHECK-NEXT: [[RETVAL_0:%.*]] = phi i32 [ 15, [[SW_DEFAULT]] ], [ -1, [[SW_BB3]] ], [ 0, [[SW_BB2]] ], [ 123, [[SW_BB1]] ], [ 55, [[ENTRY:%.*]] ]
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; CHECK-NEXT: ret i32 [[RETVAL_0]]
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;
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entry:
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switch i32 %c, label %sw.default [
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i32 42, label %return
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i32 43, label %sw.bb1
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i32 44, label %sw.bb2
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i32 45, label %sw.bb3
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]
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sw.bb1: br label %return
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sw.bb2: br label %return
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sw.bb3: br label %return
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sw.default: br label %return
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return:
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%retval.0 = phi i32 [ 15, %sw.default ], [ -1, %sw.bb3 ], [ 0, %sw.bb2 ], [ 123, %sw.bb1 ], [ 55, %entry ]
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ret i32 %retval.0
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}
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define i32 @bar(i32 %c) {
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; CHECK-LABEL: @bar(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[SWITCH_TABLEIDX:%.*]] = sub i32 [[C:%.*]], 42
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; CHECK-NEXT: [[TMP0:%.*]] = icmp ult i32 [[SWITCH_TABLEIDX]], 4
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; CHECK-NEXT: br i1 [[TMP0]], label [[SWITCH_LOOKUP:%.*]], label [[RETURN:%.*]]
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; CHECK: switch.lookup:
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; CHECK-NEXT: [[SWITCH_GEP:%.*]] = getelementptr inbounds [4 x i32], [4 x i32]* @switch.table.bar, i32 0, i32 [[SWITCH_TABLEIDX]]
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; CHECK-NEXT: [[SWITCH_LOAD:%.*]] = load i32, i32* [[SWITCH_GEP]]
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; CHECK-NEXT: ret i32 [[SWITCH_LOAD]]
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; CHECK: return:
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; CHECK-NEXT: ret i32 15
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;
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entry:
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switch i32 %c, label %sw.default [
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i32 42, label %return
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i32 43, label %sw.bb1
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i32 44, label %sw.bb2
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i32 45, label %sw.bb3
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]
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sw.bb1: br label %return
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sw.bb2: br label %return
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sw.bb3: br label %return
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sw.default: br label %return
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return:
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%retval.0 = phi i32 [ 15, %sw.default ], [ -1, %sw.bb3 ], [ 0, %sw.bb2 ], [ 123, %sw.bb1 ], [ 55, %entry ]
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ret i32 %retval.0
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}
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