ba3d29f871
Users of LCSSA may not expect non-phi uses when checking the uses outside a loop, which may cause crashes. This is due to the fact that we do not update uses in unreachable blocks. To ensure all reachable uses outside the loop are phis, update uses in unreachable blocks to use poison in dead code. Fixes #57508.
168 lines
6.7 KiB
LLVM
168 lines
6.7 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt -loop-vectorize -force-vector-interleave=1 -force-vector-width=4 -S %s | FileCheck %s
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target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128"
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define void @test() {
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; CHECK-LABEL: @test(
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; CHECK-NEXT: br label [[FOR_BODY_LR_PH_I_I_I:%.*]]
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; CHECK: for.body.lr.ph.i.i.i:
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; CHECK-NEXT: br i1 true, label [[SCALAR_PH:%.*]], label [[VECTOR_PH:%.*]]
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; CHECK: vector.ph:
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; CHECK-NEXT: br label [[VECTOR_BODY:%.*]]
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; CHECK: vector.body:
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; CHECK-NEXT: [[INDEX:%.*]] = phi i64 [ 0, [[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], [[VECTOR_BODY]] ]
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; CHECK-NEXT: [[INDEX_NEXT]] = add nuw i64 [[INDEX]], 4
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; CHECK-NEXT: br i1 true, label [[MIDDLE_BLOCK:%.*]], label [[VECTOR_BODY]], !llvm.loop [[LOOP0:![0-9]+]]
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; CHECK: middle.block:
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; CHECK-NEXT: [[CMP_N:%.*]] = icmp eq i64 1, 0
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; CHECK-NEXT: br i1 [[CMP_N]], label [[FOR_END_I_I_I:%.*]], label [[SCALAR_PH]]
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; CHECK: scalar.ph:
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; CHECK-NEXT: [[BC_RESUME_VAL:%.*]] = phi i64 [ 0, [[MIDDLE_BLOCK]] ], [ 0, [[FOR_BODY_LR_PH_I_I_I]] ]
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; CHECK-NEXT: br label [[FOR_BODY_I_I_I:%.*]]
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; CHECK: for.body.i.i.i:
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; CHECK-NEXT: [[INDVARS_IV:%.*]] = phi i64 [ [[INDVARS_IV_NEXT:%.*]], [[FOR_INC_I_I_I:%.*]] ], [ [[BC_RESUME_VAL]], [[SCALAR_PH]] ]
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; CHECK-NEXT: br label [[FOR_INC_I_I_I]]
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; CHECK: for.inc.i.i.i:
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; CHECK-NEXT: [[INDVARS_IV_NEXT]] = add i64 [[INDVARS_IV]], 1
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; CHECK-NEXT: [[LFTR_WIDEIV:%.*]] = trunc i64 [[INDVARS_IV_NEXT]] to i32
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; CHECK-NEXT: [[EXITCOND:%.*]] = icmp ne i32 [[LFTR_WIDEIV]], undef
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; CHECK-NEXT: br i1 [[EXITCOND]], label [[FOR_BODY_I_I_I]], label [[FOR_END_I_I_I]], !llvm.loop [[LOOP2:![0-9]+]]
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; CHECK: for.end.i.i.i:
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; CHECK-NEXT: [[LCSSA:%.*]] = phi ptr [ undef, [[FOR_INC_I_I_I]] ], [ undef, [[MIDDLE_BLOCK]] ]
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; CHECK-NEXT: unreachable
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;
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br label %for.body.lr.ph.i.i.i
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for.body.lr.ph.i.i.i:
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br label %for.body.i.i.i
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for.body.i.i.i:
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%indvars.iv = phi i64 [ %indvars.iv.next, %for.inc.i.i.i ], [ 0, %for.body.lr.ph.i.i.i ]
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br label %for.inc.i.i.i
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for.inc.i.i.i:
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%indvars.iv.next = add i64 %indvars.iv, 1
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%lftr.wideiv = trunc i64 %indvars.iv.next to i32
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%exitcond = icmp ne i32 %lftr.wideiv, undef
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br i1 %exitcond, label %for.body.i.i.i, label %for.end.i.i.i
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for.end.i.i.i:
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%lcssa = phi ptr [ undef, %for.inc.i.i.i ]
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unreachable
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}
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; PR16139
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define void @test2(ptr %x) {
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; CHECK-LABEL: @test2(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: indirectbr ptr [[X:%.*]], [label [[L0:%.*]], label %L1]
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; CHECK: L0:
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; CHECK-NEXT: br label [[L0]]
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; CHECK: L1:
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; CHECK-NEXT: ret void
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;
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entry:
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indirectbr ptr %x, [ label %L0, label %L1 ]
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L0:
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br label %L0
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L1:
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ret void
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}
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; This loop has different uniform instructions before and after LCSSA.
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define void @test3() {
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; CHECK-LABEL: @test3(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[ADD41:%.*]] = add i32 undef, undef
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; CHECK-NEXT: [[IDXPROM4736:%.*]] = zext i32 [[ADD41]] to i64
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; CHECK-NEXT: br label [[WHILE_BODY:%.*]]
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; CHECK: while.body:
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; CHECK-NEXT: [[IDXPROM4738:%.*]] = phi i64 [ [[IDXPROM47:%.*]], [[WHILE_BODY]] ], [ [[IDXPROM4736]], [[ENTRY:%.*]] ]
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; CHECK-NEXT: [[POS_337:%.*]] = phi i32 [ [[INC46:%.*]], [[WHILE_BODY]] ], [ [[ADD41]], [[ENTRY]] ]
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; CHECK-NEXT: [[INC46]] = add i32 [[POS_337]], 1
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; CHECK-NEXT: [[ARRAYIDX48:%.*]] = getelementptr inbounds [1024 x i8], ptr undef, i64 0, i64 [[IDXPROM4738]]
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; CHECK-NEXT: store i8 0, ptr [[ARRAYIDX48]], align 1
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; CHECK-NEXT: [[AND43:%.*]] = and i32 [[INC46]], 3
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; CHECK-NEXT: [[CMP44:%.*]] = icmp eq i32 [[AND43]], 0
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; CHECK-NEXT: [[IDXPROM47]] = zext i32 [[INC46]] to i64
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; CHECK-NEXT: br i1 [[CMP44]], label [[WHILE_END:%.*]], label [[WHILE_BODY]]
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; CHECK: while.end:
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; CHECK-NEXT: [[INC46_LCSSA:%.*]] = phi i32 [ [[INC46]], [[WHILE_BODY]] ]
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; CHECK-NEXT: [[ADD58:%.*]] = add i32 [[INC46_LCSSA]], 4
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; CHECK-NEXT: ret void
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;
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entry:
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%add41 = add i32 undef, undef
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%idxprom4736 = zext i32 %add41 to i64
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br label %while.body
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while.body:
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%idxprom4738 = phi i64 [ %idxprom47, %while.body ], [ %idxprom4736, %entry ]
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%pos.337 = phi i32 [ %inc46, %while.body ], [ %add41, %entry ]
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%inc46 = add i32 %pos.337, 1
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%arrayidx48 = getelementptr inbounds [1024 x i8], ptr undef, i64 0, i64 %idxprom4738
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store i8 0, i8* %arrayidx48, align 1
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%and43 = and i32 %inc46, 3
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%cmp44 = icmp eq i32 %and43, 0
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%idxprom47 = zext i32 %inc46 to i64
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br i1 %cmp44, label %while.end, label %while.body
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while.end:
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%add58 = add i32 %inc46, 4
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ret void
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}
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; Make sure LV doesn't crash on IR where some LCSSA uses are unreachable.
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define i32 @pr57508(ptr %src) {
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; CHECK-LABEL: @pr57508(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: br i1 false, label [[SCALAR_PH:%.*]], label [[VECTOR_PH:%.*]]
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; CHECK: vector.ph:
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; CHECK-NEXT: br label [[VECTOR_BODY:%.*]]
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; CHECK: vector.body:
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; CHECK-NEXT: [[INDEX:%.*]] = phi i64 [ 0, [[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], [[VECTOR_BODY]] ]
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; CHECK-NEXT: [[INDEX_NEXT]] = add nuw i64 [[INDEX]], 4
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; CHECK-NEXT: [[TMP0:%.*]] = icmp eq i64 [[INDEX_NEXT]], 2000
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; CHECK-NEXT: br i1 [[TMP0]], label [[MIDDLE_BLOCK:%.*]], label [[VECTOR_BODY]], !llvm.loop [[LOOP4:![0-9]+]]
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; CHECK: middle.block:
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; CHECK-NEXT: [[CMP_N:%.*]] = icmp eq i64 2001, 2000
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; CHECK-NEXT: br i1 [[CMP_N]], label [[LOOP_EXIT:%.*]], label [[SCALAR_PH]]
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; CHECK: scalar.ph:
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; CHECK-NEXT: [[BC_RESUME_VAL:%.*]] = phi i64 [ 2000, [[MIDDLE_BLOCK]] ], [ 0, [[ENTRY:%.*]] ]
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; CHECK-NEXT: [[BC_RESUME_VAL1:%.*]] = phi i32 [ 2000, [[MIDDLE_BLOCK]] ], [ 0, [[ENTRY]] ]
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; CHECK-NEXT: br label [[LOOP:%.*]]
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; CHECK: loop:
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; CHECK-NEXT: [[IV:%.*]] = phi i64 [ [[IV_NEXT:%.*]], [[LOOP]] ], [ [[BC_RESUME_VAL]], [[SCALAR_PH]] ]
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; CHECK-NEXT: [[LOCAL:%.*]] = phi i32 [ [[LOCAL_NEXT:%.*]], [[LOOP]] ], [ [[BC_RESUME_VAL1]], [[SCALAR_PH]] ]
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; CHECK-NEXT: [[IV_NEXT]] = add nuw nsw i64 [[IV]], 1
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; CHECK-NEXT: [[LOCAL_NEXT]] = add i32 [[LOCAL]], 1
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; CHECK-NEXT: [[EC:%.*]] = icmp eq i64 [[IV]], 2000
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; CHECK-NEXT: br i1 [[EC]], label [[LOOP_EXIT]], label [[LOOP]], !llvm.loop [[LOOP5:![0-9]+]]
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; CHECK: loop.exit:
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; CHECK-NEXT: unreachable
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; CHECK: bb:
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; CHECK-NEXT: [[LOCAL_USE:%.*]] = add i32 poison, 1
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; CHECK-NEXT: ret i32 [[LOCAL_USE]]
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;
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entry:
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br label %loop
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loop:
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%iv = phi i64 [ %iv.next, %loop ], [ 0, %entry ]
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%local = phi i32 [ %local.next, %loop ], [ 0, %entry ]
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%iv.next = add nuw nsw i64 %iv, 1
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%local.next = add i32 %local, 1
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%ec = icmp eq i64 %iv, 2000
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br i1 %ec, label %loop.exit, label %loop
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loop.exit:
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unreachable
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bb:
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%local.use = add i32 %local, 1
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ret i32 %local.use
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}
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