184 lines
4.6 KiB
LLVM
184 lines
4.6 KiB
LLVM
; RUN: opt < %s -jump-threading -dce -S | FileCheck %s
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declare void @llvm.experimental.guard(i1, ...)
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declare i32 @f1()
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declare i32 @f2()
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define i32 @branch_implies_guard(i32 %a) {
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; CHECK-LABEL: @branch_implies_guard(
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%cond = icmp slt i32 %a, 10
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br i1 %cond, label %T1, label %F1
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T1:
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; CHECK: T1.split
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; CHECK: %v1 = call i32 @f1()
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; CHECK-NEXT: %retVal
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; CHECK-NEXT: br label %Merge
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%v1 = call i32 @f1()
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br label %Merge
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F1:
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; CHECK: F1.split
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; CHECK: %v2 = call i32 @f2()
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; CHECK-NEXT: %retVal
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; CHECK-NEXT: %condGuard
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; CHECK-NEXT: call void (i1, ...) @llvm.experimental.guard(i1 %condGuard
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; CHECK-NEXT: br label %Merge
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%v2 = call i32 @f2()
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br label %Merge
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Merge:
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; CHECK: Merge
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; CHECK-NOT: call void(i1, ...) @llvm.experimental.guard(
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%retPhi = phi i32 [ %v1, %T1 ], [ %v2, %F1 ]
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%retVal = add i32 %retPhi, 10
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%condGuard = icmp slt i32 %a, 20
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call void(i1, ...) @llvm.experimental.guard(i1 %condGuard) [ "deopt"() ]
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ret i32 %retVal
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}
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define i32 @not_branch_implies_guard(i32 %a) {
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; CHECK-LABEL: @not_branch_implies_guard(
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%cond = icmp slt i32 %a, 20
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br i1 %cond, label %T1, label %F1
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T1:
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; CHECK: T1.split:
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; CHECK-NEXT: %v1 = call i32 @f1()
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; CHECK-NEXT: %retVal
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; CHECK-NEXT: %condGuard
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; CHECK-NEXT: call void (i1, ...) @llvm.experimental.guard(i1 %condGuard
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; CHECK-NEXT: br label %Merge
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%v1 = call i32 @f1()
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br label %Merge
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F1:
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; CHECK: F1.split:
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; CHECK-NEXT: %v2 = call i32 @f2()
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; CHECK-NEXT: %retVal
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; CHECK-NEXT: br label %Merge
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%v2 = call i32 @f2()
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br label %Merge
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Merge:
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; CHECK: Merge
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; CHECK-NOT: call void(i1, ...) @llvm.experimental.guard(
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%retPhi = phi i32 [ %v1, %T1 ], [ %v2, %F1 ]
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%retVal = add i32 %retPhi, 10
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%condGuard = icmp sgt i32 %a, 10
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call void(i1, ...) @llvm.experimental.guard(i1 %condGuard) [ "deopt"() ]
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ret i32 %retVal
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}
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define i32 @branch_overlaps_guard(i32 %a) {
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; CHECK-LABEL: @branch_overlaps_guard(
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%cond = icmp slt i32 %a, 20
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br i1 %cond, label %T1, label %F1
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T1:
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; CHECK: T1:
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; CHECK-NEXT: %v1 = call i32 @f1()
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; CHECK-NEXT: br label %Merge
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%v1 = call i32 @f1()
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br label %Merge
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F1:
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; CHECK: F1:
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; CHECK-NEXT: %v2 = call i32 @f2()
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; CHECK-NEXT: br label %Merge
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%v2 = call i32 @f2()
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br label %Merge
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Merge:
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; CHECK: Merge
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; CHECK: %condGuard = icmp slt i32 %a, 10
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; CHECK-NEXT: call void (i1, ...) @llvm.experimental.guard(i1 %condGuard) [ "deopt"() ]
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%retPhi = phi i32 [ %v1, %T1 ], [ %v2, %F1 ]
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%retVal = add i32 %retPhi, 10
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%condGuard = icmp slt i32 %a, 10
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call void(i1, ...) @llvm.experimental.guard(i1 %condGuard) [ "deopt"() ]
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ret i32 %retVal
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}
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define i32 @branch_doesnt_overlap_guard(i32 %a) {
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; CHECK-LABEL: @branch_doesnt_overlap_guard(
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%cond = icmp slt i32 %a, 10
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br i1 %cond, label %T1, label %F1
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T1:
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; CHECK: T1:
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; CHECK-NEXT: %v1 = call i32 @f1()
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; CHECK-NEXT: br label %Merge
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%v1 = call i32 @f1()
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br label %Merge
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F1:
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; CHECK: F1:
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; CHECK-NEXT: %v2 = call i32 @f2()
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; CHECK-NEXT: br label %Merge
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%v2 = call i32 @f2()
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br label %Merge
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Merge:
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; CHECK: Merge
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; CHECK: %condGuard = icmp sgt i32 %a, 20
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; CHECK-NEXT: call void (i1, ...) @llvm.experimental.guard(i1 %condGuard) [ "deopt"() ]
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%retPhi = phi i32 [ %v1, %T1 ], [ %v2, %F1 ]
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%retVal = add i32 %retPhi, 10
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%condGuard = icmp sgt i32 %a, 20
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call void(i1, ...) @llvm.experimental.guard(i1 %condGuard) [ "deopt"() ]
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ret i32 %retVal
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}
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define i32 @not_a_diamond1(i32 %a, i1 %cond1) {
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; CHECK-LABEL: @not_a_diamond1(
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br i1 %cond1, label %Pred, label %Exit
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Pred:
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; CHECK: Pred:
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; CHECK-NEXT: switch i32 %a, label %Exit
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switch i32 %a, label %Exit [
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i32 10, label %Merge
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i32 20, label %Merge
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]
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Merge:
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; CHECK: Merge:
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; CHECK-NEXT: call void (i1, ...) @llvm.experimental.guard(i1 %cond1) [ "deopt"() ]
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; CHECK-NEXT: br label %Exit
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call void(i1, ...) @llvm.experimental.guard(i1 %cond1) [ "deopt"() ]
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br label %Exit
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Exit:
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; CHECK: Exit:
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; CHECK-NEXT: ret i32 %a
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ret i32 %a
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}
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define void @not_a_diamond2(i32 %a, i1 %cond1) {
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; CHECK-LABEL: @not_a_diamond2(
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br label %Parent
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Merge:
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call void(i1, ...) @llvm.experimental.guard(i1 %cond1)[ "deopt"() ]
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ret void
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Pred:
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; CHECK-NEXT: Pred:
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; CHECK-NEXT: switch i32 %a, label %Exit
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switch i32 %a, label %Exit [
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i32 10, label %Merge
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i32 20, label %Merge
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]
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Parent:
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br label %Pred
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Exit:
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; CHECK: Merge:
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; CHECK-NEXT: call void (i1, ...) @llvm.experimental.guard(i1 %cond1) [ "deopt"() ]
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; CHECK-NEXT: ret void
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ret void
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}
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