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8d28637a8e
By definition of Implication operator, `false -> true` and `false -> false`. It means that `false` implies any predicate, no matter true or false. We don't need to go any further trying to prove the statement we need and just always say that `false` implies it in this case. In practice it means that we are trying to prove something guarded by `false` condition, which means that this code is unreachable, and we can safely prove any fact or perform any transform in this code. Differential Revision: https://reviews.llvm.org/D98706 Reviewed By: lebedev.ri
98 lines
4.2 KiB
LLVM
98 lines
4.2 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt < %s -indvars -S | FileCheck %s
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; rdar://10359193: assert "IndVar type must match IVInit type"
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target datalayout = "e-p:32:32:32-i1:8:32-i8:8:32-i16:16:32-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:32:64-v128:32:128-a0:0:32-n32-S32"
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target triple = "thumbv7-apple-darwin"
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define void @test() nounwind {
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; CHECK-LABEL: @test(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: br label [[WHILE_COND:%.*]]
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; CHECK: while.cond.loopexit:
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; CHECK-NEXT: br label [[WHILE_COND_BACKEDGE:%.*]]
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; CHECK: while.cond:
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; CHECK-NEXT: br i1 true, label [[WHILE_END:%.*]], label [[WHILE_BODY:%.*]]
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; CHECK: while.body:
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; CHECK-NEXT: br i1 undef, label [[IF_THEN165:%.*]], label [[WHILE_COND_BACKEDGE]]
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; CHECK: while.cond.backedge:
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; CHECK-NEXT: br label [[WHILE_COND]]
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; CHECK: if.then165:
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; CHECK-NEXT: br i1 undef, label [[WHILE_COND_BACKEDGE]], label [[FOR_BODY_LR_PH_I81:%.*]]
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; CHECK: for.body.lr.ph.i81:
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; CHECK-NEXT: br label [[FOR_BODY_I86:%.*]]
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; CHECK: for.body.i86:
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; CHECK-NEXT: [[CMP196_I:%.*]] = icmp ult i32 0, undef
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; CHECK-NEXT: br i1 [[CMP196_I]], label [[FOR_BODY21_LR_PH_I:%.*]], label [[FOR_END_I129:%.*]]
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; CHECK: for.body21.lr.ph.i:
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; CHECK-NEXT: br label [[FOR_BODY21_I:%.*]]
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; CHECK: for.body21.i:
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; CHECK-NEXT: [[DESTYPIXELPTR_010_I:%.*]] = phi i8* [ null, [[FOR_BODY21_LR_PH_I]] ], [ [[INCDEC_PTR_I:%.*]], [[IF_END_I126:%.*]] ]
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; CHECK-NEXT: br i1 undef, label [[IF_END_I126]], label [[IF_ELSE_I124:%.*]]
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; CHECK: if.else.i124:
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; CHECK-NEXT: store i8 undef, i8* [[DESTYPIXELPTR_010_I]], align 1
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; CHECK-NEXT: br label [[IF_END_I126]]
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; CHECK: if.end.i126:
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; CHECK-NEXT: [[INCDEC_PTR_I]] = getelementptr inbounds i8, i8* [[DESTYPIXELPTR_010_I]], i32 1
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; CHECK-NEXT: br i1 true, label [[FOR_BODY21_I]], label [[FOR_END_I129_LOOPEXIT:%.*]]
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; CHECK: for.end.i129.loopexit:
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; CHECK-NEXT: br label [[FOR_END_I129]]
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; CHECK: for.end.i129:
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; CHECK-NEXT: br i1 false, label [[FOR_BODY_I86]], label [[WHILE_COND_LOOPEXIT:%.*]]
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; CHECK: while.end:
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; CHECK-NEXT: br label [[BAIL:%.*]]
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; CHECK: bail:
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; CHECK-NEXT: unreachable
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; CHECK: return:
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; CHECK-NEXT: ret void
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;
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entry:
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br label %while.cond
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while.cond:
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br i1 undef, label %while.end, label %while.body
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while.body: ; preds = %while.cond
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br i1 undef, label %if.then165, label %while.cond
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if.then165: ; preds = %while.body
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br i1 undef, label %while.cond, label %for.body.lr.ph.i81
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for.body.lr.ph.i81: ; preds = %if.then165
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br label %for.body.i86
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for.body.i86: ; preds = %for.end.i129, %for.body.lr.ph.i81
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%cmp196.i = icmp ult i32 0, undef
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br i1 %cmp196.i, label %for.body21.lr.ph.i, label %for.end.i129
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for.body21.lr.ph.i: ; preds = %for.body.i86
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br label %for.body21.i
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for.body21.i:
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%destYPixelPtr.010.i = phi i8* [ null, %for.body21.lr.ph.i ], [ %incdec.ptr.i, %if.end.i126 ]
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%x.09.i = phi i32 [ 0, %for.body21.lr.ph.i ], [ %inc.i125, %if.end.i126 ]
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br i1 undef, label %if.end.i126, label %if.else.i124
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if.else.i124: ; preds = %for.body21.i
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store i8 undef, i8* %destYPixelPtr.010.i, align 1
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br label %if.end.i126
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if.end.i126: ; preds = %if.else.i124, %for.body21.i
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%incdec.ptr.i = getelementptr inbounds i8, i8* %destYPixelPtr.010.i, i32 1
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%inc.i125 = add i32 %x.09.i, 1
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%cmp19.i = icmp ult i32 %inc.i125, undef
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br i1 %cmp19.i, label %for.body21.i, label %for.end.i129
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for.end.i129: ; preds = %if.end.i126, %for.body.i86
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br i1 undef, label %for.body.i86, label %while.cond
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while.end: ; preds = %while.cond
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br label %bail
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bail: ; preds = %while.end, %lor.lhs.false44, %lor.lhs.false41, %if.end29, %if.end
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unreachable
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return: ; preds = %lor.lhs.false20, %lor.lhs.false12, %lor.lhs.false, %entry
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ret void
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}
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