derek.holloway
7502bf64a4
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81 lines
2.5 KiB
LLVM
81 lines
2.5 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 2
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; RUN: opt < %s -S -passes='simplifycfg<speculate-blocks>' | FileCheck %s --check-prefix=YES
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; RUN: opt < %s -S -passes='simplifycfg<no-speculate-blocks>' | FileCheck %s --check-prefix=NO
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define i32 @f(i1 %a) {
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; YES-LABEL: define i32 @f
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; YES-SAME: (i1 [[A:%.*]]) {
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; YES-NEXT: entry:
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; YES-NEXT: [[SPEC_SELECT:%.*]] = select i1 [[A]], i32 5, i32 2
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; YES-NEXT: ret i32 [[SPEC_SELECT]]
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;
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; NO-LABEL: define i32 @f
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; NO-SAME: (i1 [[A:%.*]]) {
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; NO-NEXT: entry:
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; NO-NEXT: br i1 [[A]], label [[BB:%.*]], label [[BB2:%.*]]
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; NO: bb:
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; NO-NEXT: br label [[BB2]]
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; NO: bb2:
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; NO-NEXT: [[R:%.*]] = phi i32 [ 2, [[ENTRY:%.*]] ], [ 5, [[BB]] ]
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; NO-NEXT: ret i32 [[R]]
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;
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entry:
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br i1 %a, label %bb, label %bb2
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bb:
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br label %bb2
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bb2:
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%r = phi i32 [ 2, %entry ], [ 5, %bb ]
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ret i32 %r
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}
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define void @fold_branch_to_common_dest(i8 %v0, i8 %v1) {
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; YES-LABEL: define void @fold_branch_to_common_dest
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; YES-SAME: (i8 [[V0:%.*]], i8 [[V1:%.*]]) {
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; YES-NEXT: pred:
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; YES-NEXT: [[C0:%.*]] = icmp eq i8 [[V0]], 0
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; YES-NEXT: [[C1:%.*]] = icmp eq i8 [[V1]], 0
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; YES-NEXT: [[OR_COND:%.*]] = select i1 [[C0]], i1 [[C1]], i1 false
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; YES-NEXT: br i1 [[OR_COND]], label [[FINAL_LEFT:%.*]], label [[FINAL_RIGHT:%.*]]
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; YES: common.ret:
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; YES-NEXT: ret void
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; YES: final_left:
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; YES-NEXT: call void @sideeffect0()
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; YES-NEXT: br label [[COMMON_RET:%.*]]
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; YES: final_right:
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; YES-NEXT: call void @sideeffect1()
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; YES-NEXT: br label [[COMMON_RET]]
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;
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; NO-LABEL: define void @fold_branch_to_common_dest
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; NO-SAME: (i8 [[V0:%.*]], i8 [[V1:%.*]]) {
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; NO-NEXT: pred:
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; NO-NEXT: [[C0:%.*]] = icmp eq i8 [[V0]], 0
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; NO-NEXT: br i1 [[C0]], label [[DISPATCH:%.*]], label [[FINAL_RIGHT:%.*]]
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; NO: dispatch:
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; NO-NEXT: [[C1:%.*]] = icmp eq i8 [[V1]], 0
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; NO-NEXT: br i1 [[C1]], label [[FINAL_LEFT:%.*]], label [[FINAL_RIGHT]]
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; NO: common.ret:
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; NO-NEXT: ret void
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; NO: final_left:
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; NO-NEXT: call void @sideeffect0()
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; NO-NEXT: br label [[COMMON_RET:%.*]]
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; NO: final_right:
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; NO-NEXT: call void @sideeffect1()
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; NO-NEXT: br label [[COMMON_RET]]
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;
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pred:
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%c0 = icmp eq i8 %v0, 0
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br i1 %c0, label %dispatch, label %final_right
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dispatch:
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%c1 = icmp eq i8 %v1, 0
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br i1 %c1, label %final_left, label %final_right
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final_left:
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call void @sideeffect0()
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ret void
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final_right:
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call void @sideeffect1()
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ret void
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}
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declare void @sideeffect0()
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declare void @sideeffect1()
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