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https://github.com/c64scene-ar/llvm-6502.git
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23b0065f29
If the loop trip count may underflow or wrap, the compiler should not generate a hardware loop since the trip count will be incorrect. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@237365 91177308-0d34-0410-b5e6-96231b3b80d8
68 lines
2.3 KiB
LLVM
68 lines
2.3 KiB
LLVM
; RUN: llc -march=hexagon -mcpu=hexagonv5 -O3 < %s | FileCheck %s
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; Test that we do not generate a hardware loop due to a potential underflow.
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; CHECK-NOT: loop0
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%struct.3 = type { i8*, i8, i8, i32, i32, i16, i16, i16, i16, i16, i16, i16, %struct.2* }
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%struct.2 = type { i16, i16, i16, i16, %struct.1* }
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%struct.1 = type { %struct.1*, %struct.0*, i32, i32, i16, [2 x i16], [2 x i16], i16 }
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%struct.0 = type { %struct.0*, i32, i32, i32, i32, i32, i32, i16, i16, i16, i8, i8, i8, i8 }
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@pairArray = external global i32**
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@carray = external global %struct.3**
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define void @test() #0 {
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entry:
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%0 = load i32**, i32*** @pairArray, align 4
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%1 = load %struct.3**, %struct.3*** @carray, align 4
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br i1 undef, label %for.end110, label %for.body
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for.body:
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%row.0199 = phi i32 [ %inc109, %for.inc108 ], [ 1, %entry ]
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%arrayidx = getelementptr inbounds i32*, i32** %0, i32 %row.0199
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%2 = load i32*, i32** %arrayidx, align 4
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br i1 undef, label %for.body48, label %for.inc108
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for.cond45:
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%cmp46 = icmp sgt i32 %dec58, 0
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br i1 %cmp46, label %for.body48, label %for.inc108
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for.body48:
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%i.1190 = phi i32 [ %dec58, %for.cond45 ], [ 0, %for.body ]
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%arrayidx50 = getelementptr inbounds i32, i32* %2, i32 %i.1190
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%3 = load i32, i32* %arrayidx50, align 4
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%cmp53 = icmp slt i32 %3, 0
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%dec58 = add nsw i32 %i.1190, -1
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br i1 %cmp53, label %for.end59, label %for.cond45
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for.end59:
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%cmp60 = icmp slt i32 %i.1190, 0
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br i1 %cmp60, label %if.then65, label %for.inc108
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if.then65:
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br label %for.body80
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for.body80:
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%j.1196.in = phi i32 [ %j.1196, %for.body80 ], [ %i.1190, %if.then65 ]
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%j.1196 = add nsw i32 %j.1196.in, 1
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%arrayidx81 = getelementptr inbounds i32, i32* %2, i32 %j.1196
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%4 = load i32, i32* %arrayidx81, align 4
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%arrayidx82 = getelementptr inbounds %struct.3*, %struct.3** %1, i32 %4
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%5 = load %struct.3*, %struct.3** %arrayidx82, align 4
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%cxcenter83 = getelementptr inbounds %struct.3, %struct.3* %5, i32 0, i32 3
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store i32 0, i32* %cxcenter83, align 4
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%6 = load i32, i32* %arrayidx81, align 4
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%arrayidx87 = getelementptr inbounds i32, i32* %2, i32 %j.1196.in
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store i32 %6, i32* %arrayidx87, align 4
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%exitcond = icmp eq i32 %j.1196, 0
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br i1 %exitcond, label %for.inc108, label %for.body80
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for.inc108:
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%inc109 = add nsw i32 %row.0199, 1
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br i1 undef, label %for.body, label %for.end110
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for.end110:
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ret void
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}
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