c9e7049754
This code is valid for any icmp, so we can safely look through a freeze when trying to find one. A caveat here is that replaceFoldableUses() may not end up replacing any uses in this case. It might make sense to use the freeze as the context instruction (rather than the terminator) if there is a freeze, to ensure that it always gets folded. This would require some changes to how replaceFoldedUses() works though, as it currently assumes that the value is valid at the end of the block.
253 lines
5.3 KiB
LLVM
253 lines
5.3 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt -jump-threading -S < %s | FileCheck %s
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declare i32 @f1()
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declare i32 @f2()
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declare void @f3()
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define i32 @test1(i1 %cond) {
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; CHECK-LABEL: @test1(
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; CHECK-NEXT: br i1 [[COND:%.*]], label [[T2:%.*]], label [[F2:%.*]]
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; CHECK: T2:
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; CHECK-NEXT: [[V1:%.*]] = call i32 @f1()
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; CHECK-NEXT: call void @f3()
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; CHECK-NEXT: ret i32 [[V1]]
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; CHECK: F2:
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; CHECK-NEXT: [[V2:%.*]] = call i32 @f2()
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; CHECK-NEXT: ret i32 [[V2]]
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;
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br i1 %cond, label %T1, label %F1
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T1:
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%v1 = call i32 @f1()
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br label %Merge
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F1:
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%v2 = call i32 @f2()
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br label %Merge
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Merge:
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%A = phi i1 [true, %T1], [false, %F1]
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%B = phi i32 [%v1, %T1], [%v2, %F1]
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%A.fr = freeze i1 %A
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br i1 %A.fr, label %T2, label %F2
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T2:
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call void @f3()
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ret i32 %B
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F2:
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ret i32 %B
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}
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define i32 @test1_cast(i1 %cond) {
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; CHECK-LABEL: @test1_cast(
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; CHECK-NEXT: br i1 [[COND:%.*]], label [[T2:%.*]], label [[F2:%.*]]
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; CHECK: T2:
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; CHECK-NEXT: [[V1:%.*]] = call i32 @f1()
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; CHECK-NEXT: call void @f3()
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; CHECK-NEXT: ret i32 [[V1]]
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; CHECK: F2:
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; CHECK-NEXT: [[V2:%.*]] = call i32 @f2()
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; CHECK-NEXT: [[A:%.*]] = trunc i32 0 to i1
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; CHECK-NEXT: ret i32 [[V2]]
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;
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br i1 %cond, label %T1, label %F1
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T1:
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%v1 = call i32 @f1()
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br label %Merge
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F1:
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%v2 = call i32 @f2()
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br label %Merge
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Merge:
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%A0 = phi i32 [1, %T1], [0, %F1]
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%B = phi i32 [%v1, %T1], [%v2, %F1]
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%A = trunc i32 %A0 to i1
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%A.fr = freeze i1 %A
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br i1 %A.fr, label %T2, label %F2
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T2:
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call void @f3()
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ret i32 %B
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F2:
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ret i32 %B
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}
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define i32 @test1_cast2(i1 %cond) {
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; CHECK-LABEL: @test1_cast2(
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; CHECK-NEXT: br i1 [[COND:%.*]], label [[T2:%.*]], label [[F2:%.*]]
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; CHECK: T2:
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; CHECK-NEXT: [[V1:%.*]] = call i32 @f1()
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; CHECK-NEXT: call void @f3()
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; CHECK-NEXT: ret i32 [[V1]]
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; CHECK: F2:
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; CHECK-NEXT: [[V2:%.*]] = call i32 @f2()
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; CHECK-NEXT: [[A0_FR:%.*]] = freeze i32 0
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; CHECK-NEXT: ret i32 [[V2]]
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;
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br i1 %cond, label %T1, label %F1
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T1:
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%v1 = call i32 @f1()
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br label %Merge
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F1:
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%v2 = call i32 @f2()
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br label %Merge
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Merge:
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%A0 = phi i32 [1, %T1], [0, %F1]
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%B = phi i32 [%v1, %T1], [%v2, %F1]
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%A0.fr = freeze i32 %A0
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%A.fr = trunc i32 %A0.fr to i1
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br i1 %A.fr, label %T2, label %F2
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T2:
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call void @f3()
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ret i32 %B
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F2:
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ret i32 %B
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}
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define i32 @test1_undef(i1 %cond) {
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; CHECK-LABEL: @test1_undef(
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; CHECK-NEXT: br i1 [[COND:%.*]], label [[T2:%.*]], label [[F2:%.*]]
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; CHECK: T2:
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; CHECK-NEXT: [[V1:%.*]] = call i32 @f1()
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; CHECK-NEXT: call void @f3()
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; CHECK-NEXT: ret i32 [[V1]]
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; CHECK: F2:
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; CHECK-NEXT: [[V2:%.*]] = call i32 @f2()
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; CHECK-NEXT: ret i32 [[V2]]
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;
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br i1 %cond, label %T1, label %F1
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T1:
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%v1 = call i32 @f1()
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br label %Merge
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F1:
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%v2 = call i32 @f2()
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br label %Merge
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Merge:
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%A = phi i1 [true, %T1], [undef, %F1]
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%B = phi i32 [%v1, %T1], [%v2, %F1]
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%A.fr = freeze i1 %A
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br i1 %A.fr, label %T2, label %F2
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T2:
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call void @f3()
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ret i32 %B
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F2:
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ret i32 %B
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}
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define i32 @test2(i1 %cond, i1 %cond2) {
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; CHECK-LABEL: @test2(
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; CHECK-NEXT: br i1 [[COND:%.*]], label [[MERGE_THREAD:%.*]], label [[MERGE:%.*]]
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; CHECK: Merge.thread:
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; CHECK-NEXT: [[V1:%.*]] = call i32 @f1()
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; CHECK-NEXT: br label [[T2:%.*]]
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; CHECK: Merge:
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; CHECK-NEXT: [[V2:%.*]] = call i32 @f2()
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; CHECK-NEXT: [[A_FR:%.*]] = freeze i1 [[COND2:%.*]]
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; CHECK-NEXT: br i1 [[A_FR]], label [[T2]], label [[F2:%.*]]
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; CHECK: T2:
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; CHECK-NEXT: [[B4:%.*]] = phi i32 [ [[V1]], [[MERGE_THREAD]] ], [ [[V2]], [[MERGE]] ]
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; CHECK-NEXT: call void @f3()
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; CHECK-NEXT: ret i32 [[B4]]
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; CHECK: F2:
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; CHECK-NEXT: ret i32 [[V2]]
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;
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br i1 %cond, label %T1, label %F1
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T1:
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%v1 = call i32 @f1()
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br label %Merge
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F1:
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%v2 = call i32 @f2()
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br label %Merge
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Merge:
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%A = phi i1 [true, %T1], [%cond2, %F1]
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%B = phi i32 [%v1, %T1], [%v2, %F1]
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%A.fr = freeze i1 %A
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br i1 %A.fr, label %T2, label %F2
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T2:
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call void @f3()
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ret i32 %B
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F2:
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ret i32 %B
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}
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define i32 @freeze_known_predicate(i1 %cond) {
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; CHECK-LABEL: @freeze_known_predicate(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: br i1 [[COND:%.*]], label [[IF:%.*]], label [[ELSE2:%.*]]
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; CHECK: if:
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; CHECK-NEXT: br label [[ELSE2]]
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; CHECK: else2:
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; CHECK-NEXT: [[PHI:%.*]] = phi i32 [ 1, [[IF]] ], [ 2, [[ENTRY:%.*]] ]
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; CHECK-NEXT: ret i32 1
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;
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entry:
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br i1 %cond, label %if, label %join
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if:
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br label %join
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join:
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%phi = phi i32 [ 1, %if ], [ 2, %entry ]
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%cmp = icmp eq i32 %phi, 0
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%cmp.fr = freeze i1 %cmp
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br i1 %cmp.fr, label %if2, label %else2
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if2:
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ret i32 0
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else2:
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ret i32 1
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}
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define i32 @freeze_known_predicate_barrier(i1 %cond) {
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; CHECK-LABEL: @freeze_known_predicate_barrier(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: br i1 [[COND:%.*]], label [[IF:%.*]], label [[ELSE2:%.*]]
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; CHECK: if:
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; CHECK-NEXT: br label [[ELSE2]]
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; CHECK: else2:
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; CHECK-NEXT: [[PHI:%.*]] = phi i32 [ 1, [[IF]] ], [ 2, [[ENTRY:%.*]] ]
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; CHECK-NEXT: [[CMP:%.*]] = icmp eq i32 [[PHI]], 0
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; CHECK-NEXT: [[TMP0:%.*]] = call i32 @f1()
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; CHECK-NEXT: ret i32 1
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;
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entry:
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br i1 %cond, label %if, label %join
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if:
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br label %join
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join:
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%phi = phi i32 [ 1, %if ], [ 2, %entry ]
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%cmp = icmp eq i32 %phi, 0
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%cmp.fr = freeze i1 %cmp
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call i32 @f1()
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br i1 %cmp.fr, label %if2, label %else2
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if2:
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ret i32 0
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else2:
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ret i32 1
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}
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