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4271526a2f
This patch adds a new undef lattice state, which is used to represent UndefValue constants or instructions producing undef. The main difference to the unknown state is that merging undef values with constants (or single element constant ranges) produces the constant/constant range, assuming all uses of the merge result will be replaced by the found constant. Contrary, merging non-single element ranges with undef needs to go to overdefined. Using unknown for UndefValues currently causes mis-compiles in CVP/LVI (PR44949) and will become problematic once we use ValueLatticeElement for SCCP. Reviewers: efriedma, reames, davide, nikic Reviewed By: efriedma Differential Revision: https://reviews.llvm.org/D75120
62 lines
1.8 KiB
LLVM
62 lines
1.8 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 i1 @cond()
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define hidden void @hoge(i1 %c1, i32 %x) {
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; CHECK-LABEL: @hoge(
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; CHECK-NEXT: bb:
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; CHECK-NEXT: br label [[BB13:%.*]]
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; CHECK: bb4:
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; CHECK-NEXT: [[TMP3:%.*]] = icmp ne i32 [[TMP7:%.*]], undef
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; CHECK-NEXT: br i1 [[TMP3]], label [[BB5:%.*]], label [[BB13]]
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; CHECK: bb5:
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; CHECK-NEXT: br label [[BB6:%.*]]
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; CHECK: bb6:
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; CHECK-NEXT: [[TMP7]] = phi i32 [ [[TMP7]], [[BB5]] ], [ [[X:%.*]], [[BB8:%.*]] ]
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; CHECK-NEXT: [[C:%.*]] = call i1 @cond()
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; CHECK-NEXT: br i1 [[C]], label [[BB4:%.*]], label [[BB8]]
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; CHECK: bb8:
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; CHECK-NEXT: br label [[BB6]]
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; CHECK: bb13:
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; CHECK-NEXT: ret void
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;
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bb:
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br i1 false, label %bb1, label %bb13
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bb1: ; preds = %bb
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br label %bb2
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bb2: ; preds = %bb12, %bb1
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%tmp = phi i32 [ 10, %bb1 ], [ %tmp7, %bb12 ]
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%tmp3 = icmp ne i32 %tmp, undef
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br label %bb4
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bb4: ; preds = %bb2
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br i1 %tmp3, label %bb5, label %bb13
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bb5: ; preds = %bb4
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br label %bb6
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bb6: ; preds = %bb8, %bb5
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%tmp7 = phi i32 [ %tmp, %bb5 ], [ %x, %bb8 ]
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%c = call i1 @cond()
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br i1 %c, label %bb9, label %bb8
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bb8: ; preds = %bb6
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br label %bb6
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bb9: ; preds = %bb6
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br label %bb10
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bb10: ; preds = %bb9
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br label %bb12
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bb12: ; preds = %bb10
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br label %bb2
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bb13: ; preds = %bb4
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ret void
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}
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