192 lines
4.5 KiB
LLVM
192 lines
4.5 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-range-to-icmp -S | FileCheck %s
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declare i32 @f(i32)
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define i32 @basic(i32 %x) {
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; CHECK-LABEL: @basic(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[X_OFF:%.*]] = add i32 [[X:%.*]], -5
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; CHECK-NEXT: [[SWITCH:%.*]] = icmp ult i32 [[X_OFF]], 3
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; CHECK-NEXT: br i1 [[SWITCH]], label [[A:%.*]], label [[DEFAULT:%.*]]
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; CHECK: common.ret:
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; CHECK-NEXT: [[COMMON_RET_OP:%.*]] = phi i32 [ [[TMP0:%.*]], [[DEFAULT]] ], [ [[TMP1:%.*]], [[A]] ]
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; CHECK-NEXT: ret i32 [[COMMON_RET_OP]]
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; CHECK: default:
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; CHECK-NEXT: [[TMP0]] = call i32 @f(i32 0)
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; CHECK-NEXT: br label [[COMMON_RET:%.*]]
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; CHECK: a:
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; CHECK-NEXT: [[TMP1]] = call i32 @f(i32 1)
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; CHECK-NEXT: br label [[COMMON_RET]]
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;
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entry:
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switch i32 %x, label %default [
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i32 5, label %a
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i32 6, label %a
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i32 7, label %a
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]
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default:
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%0 = call i32 @f(i32 0)
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ret i32 %0
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a:
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%1 = call i32 @f(i32 1)
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ret i32 %1
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}
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define i32 @unreachable(i32 %x) {
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; CHECK-LABEL: @unreachable(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[X_OFF:%.*]] = add i32 [[X:%.*]], -5
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; CHECK-NEXT: [[SWITCH:%.*]] = icmp ult i32 [[X_OFF]], 3
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; CHECK-NEXT: br i1 [[SWITCH]], label [[A:%.*]], label [[B:%.*]]
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; CHECK: common.ret:
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; CHECK-NEXT: [[COMMON_RET_OP:%.*]] = phi i32 [ [[TMP0:%.*]], [[A]] ], [ [[TMP1:%.*]], [[B]] ]
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; CHECK-NEXT: ret i32 [[COMMON_RET_OP]]
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; CHECK: a:
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; CHECK-NEXT: [[TMP0]] = call i32 @f(i32 0)
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; CHECK-NEXT: br label [[COMMON_RET:%.*]]
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; CHECK: b:
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; CHECK-NEXT: [[TMP1]] = call i32 @f(i32 1)
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; CHECK-NEXT: br label [[COMMON_RET]]
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;
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entry:
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switch i32 %x, label %unreachable [
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i32 5, label %a
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i32 6, label %a
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i32 7, label %a
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i32 10, label %b
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i32 20, label %b
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i32 30, label %b
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i32 40, label %b
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]
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unreachable:
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unreachable
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a:
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%0 = call i32 @f(i32 0)
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ret i32 %0
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b:
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%1 = call i32 @f(i32 1)
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ret i32 %1
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}
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define i32 @unreachable2(i32 %x) {
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; CHECK-LABEL: @unreachable2(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[X_OFF:%.*]] = add i32 [[X:%.*]], -5
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; CHECK-NEXT: [[SWITCH:%.*]] = icmp ult i32 [[X_OFF]], 3
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; CHECK-NEXT: br i1 [[SWITCH]], label [[A:%.*]], label [[B:%.*]]
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; CHECK: common.ret:
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; CHECK-NEXT: [[COMMON_RET_OP:%.*]] = phi i32 [ [[TMP0:%.*]], [[A]] ], [ [[TMP1:%.*]], [[B]] ]
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; CHECK-NEXT: ret i32 [[COMMON_RET_OP]]
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; CHECK: a:
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; CHECK-NEXT: [[TMP0]] = call i32 @f(i32 0)
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; CHECK-NEXT: br label [[COMMON_RET:%.*]]
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; CHECK: b:
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; CHECK-NEXT: [[TMP1]] = call i32 @f(i32 1)
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; CHECK-NEXT: br label [[COMMON_RET]]
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;
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entry:
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; Note: folding the most popular case destination into the default
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; would prevent switch-to-icmp here.
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switch i32 %x, label %unreachable [
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i32 5, label %a
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i32 6, label %a
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i32 7, label %a
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i32 10, label %b
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i32 20, label %b
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]
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unreachable:
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unreachable
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a:
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%0 = call i32 @f(i32 0)
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ret i32 %0
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b:
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%1 = call i32 @f(i32 1)
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ret i32 %1
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}
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; This would crash because we did not clean up the
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; default block of the switch before removing the switch.
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define void @PR42737(i32* %a, i1 %c) {
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; CHECK-LABEL: @PR42737(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: unreachable
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;
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entry:
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br i1 %c, label %switch, label %else
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else:
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store i32 2, i32* %a
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br label %switch
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switch:
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%cleanup.dest1 = phi i32 [ 0, %else ], [ 3, %entry ]
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switch i32 %cleanup.dest1, label %unreach1 [
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i32 0, label %cleanup1
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i32 3, label %cleanup2
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]
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cleanup1:
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br label %unreach2
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cleanup2:
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br label %unreach2
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unreach1:
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%phi2 = phi i32 [ %cleanup.dest1, %switch ]
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unreachable
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unreach2:
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unreachable
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}
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define void @pr53208_single_reachable_dest(i8 %sw, i32* %p0) {
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; CHECK-LABEL: @pr53208_single_reachable_dest(
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; CHECK-NEXT: group2:
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; CHECK-NEXT: call void @bar(i32* [[P0:%.*]])
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; CHECK-NEXT: ret void
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;
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switch i8 %sw, label %group3 [
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i8 0, label %group1
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i8 1, label %group1
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i8 2, label %group1
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i8 3, label %group1
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i8 11, label %group1
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i8 12, label %group1
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i8 13, label %group1
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i8 7, label %group1
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i8 17, label %group1
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i8 14, label %group1
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i8 15, label %group1
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i8 4, label %group2
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i8 5, label %group2
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i8 6, label %group2
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i8 8, label %group2
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i8 9, label %group2
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i8 10, label %group2
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]
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group1:
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br label %exit
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group2:
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br label %exit
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group3:
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br label %exit
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exit:
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%phi = phi i32* [ null, %group3 ], [ %p0, %group2 ], [ null, %group1 ]
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call void @bar(i32* %phi)
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ret void
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}
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declare void @bar(i32* nonnull dereferenceable(4))
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