a33e311a3b
When deciding the safety of generating smlad, we checked for any writes within the block that may alias with any of the loads that need to be widened. This is overly conservative because it only matters when there's a potential aliasing write to a location accessed by a pair of loads. Now we check for aliasing writes only once, during setup. If two loads are found to have an aliasing write between them, we don't add these loads to LoadPairs. This means that later during the transform, we can safely widened a pair without worrying about aliasing. However, to maintain correctness, we also need to change the way that wide loads are inserted because the order is now important. The MatchSMLAD method has also been changed, absorbing MatchReductions and AddMACCandidate to hopefully improve readability. Differential Revision: https://reviews.llvm.org/D6102 llvm-svn: 360567
96 lines
3.5 KiB
LLVM
96 lines
3.5 KiB
LLVM
; RUN: opt -mtriple=arm-arm-eabi -mcpu=cortex-m33 < %s -arm-parallel-dsp -S | FileCheck %s
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; CHECK-LABEL: @test1
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; CHECK: %mac1{{\.}}026 = phi i32 [ [[V8:%[0-9]+]], %for.body ], [ 0, %for.body.preheader ]
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; CHECK: [[V4:%[0-9]+]] = bitcast i16* %arrayidx to i32*
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; CHECK: [[V5:%[0-9]+]] = load i32, i32* [[V4]], align 2
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; CHECK: [[V6:%[0-9]+]] = bitcast i16* %arrayidx3 to i32*
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; CHECK: [[V7:%[0-9]+]] = load i32, i32* [[V6]], align 2
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; CHECK: [[V8]] = call i32 @llvm.arm.smlad(i32 [[V7]], i32 [[V5]], i32 %mac1{{\.}}026)
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define dso_local i32 @test1(i32 %arg, i32* nocapture readnone %arg1, i16* nocapture readonly %arg2, i16* nocapture readonly %arg3) {
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entry:
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%cmp24 = icmp sgt i32 %arg, 0
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br i1 %cmp24, label %for.body.preheader, label %for.cond.cleanup
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for.body.preheader:
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%.pre = load i16, i16* %arg3, align 2
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%.pre27 = load i16, i16* %arg2, align 2
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br label %for.body
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for.cond.cleanup:
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%mac1.0.lcssa = phi i32 [ 0, %entry ], [ %add11, %for.body ]
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ret i32 %mac1.0.lcssa
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for.body:
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%mac1.026 = phi i32 [ %add11, %for.body ], [ 0, %for.body.preheader ]
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%i.025 = phi i32 [ %add, %for.body ], [ 0, %for.body.preheader ]
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%arrayidx = getelementptr inbounds i16, i16* %arg3, i32 %i.025
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%0 = load i16, i16* %arrayidx, align 2
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%add = add nuw nsw i32 %i.025, 1
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%arrayidx1 = getelementptr inbounds i16, i16* %arg3, i32 %add
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%1 = load i16, i16* %arrayidx1, align 2
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%arrayidx3 = getelementptr inbounds i16, i16* %arg2, i32 %i.025
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%2 = load i16, i16* %arrayidx3, align 2
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%conv = sext i16 %2 to i32
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%conv4 = sext i16 %0 to i32
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%mul = mul nsw i32 %conv, %conv4
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%arrayidx6 = getelementptr inbounds i16, i16* %arg2, i32 %add
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%3 = load i16, i16* %arrayidx6, align 2
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%conv7 = sext i16 %3 to i32
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%conv8 = sext i16 %1 to i32
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%mul9 = mul nsw i32 %conv7, %conv8
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%add10 = add i32 %mul, %mac1.026
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; And here the Add is the LHS, the Mul the RHS
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%add11 = add i32 %add10, %mul9
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%exitcond = icmp ne i32 %add, %arg
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br i1 %exitcond, label %for.body, label %for.cond.cleanup
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}
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; Here we have i8 loads, which we do want to support, but don't handle yet.
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;
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; CHECK-LABEL: @test2
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; CHECK-NOT: call i32 @llvm.arm.smlad
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;
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define dso_local i32 @test2(i32 %arg, i32* nocapture readnone %arg1, i8* nocapture readonly %arg2, i8* nocapture readonly %arg3) {
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entry:
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%cmp24 = icmp sgt i32 %arg, 0
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br i1 %cmp24, label %for.body.preheader, label %for.cond.cleanup
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for.body.preheader:
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%.pre = load i8, i8* %arg3, align 2
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%.pre27 = load i8, i8* %arg2, align 2
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br label %for.body
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for.cond.cleanup:
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%mac1.0.lcssa = phi i32 [ 0, %entry ], [ %add11, %for.body ]
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ret i32 %mac1.0.lcssa
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for.body:
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%mac1.026 = phi i32 [ %add11, %for.body ], [ 0, %for.body.preheader ]
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%i.025 = phi i32 [ %add, %for.body ], [ 0, %for.body.preheader ]
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%arrayidx = getelementptr inbounds i8, i8* %arg3, i32 %i.025
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%0 = load i8, i8* %arrayidx, align 2
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%add = add nuw nsw i32 %i.025, 1
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%arrayidx1 = getelementptr inbounds i8, i8* %arg3, i32 %add
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%1 = load i8, i8* %arrayidx1, align 2
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%arrayidx3 = getelementptr inbounds i8, i8* %arg2, i32 %i.025
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%2 = load i8, i8* %arrayidx3, align 2
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%conv = sext i8 %2 to i32
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%conv4 = sext i8 %0 to i32
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%mul = mul nsw i32 %conv, %conv4
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%arrayidx6 = getelementptr inbounds i8, i8* %arg2, i32 %add
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%3 = load i8, i8* %arrayidx6, align 2
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%conv7 = sext i8 %3 to i32
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%conv8 = sext i8 %1 to i32
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%mul9 = mul nsw i32 %conv7, %conv8
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%add10 = add i32 %mul, %mac1.026
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%add11 = add i32 %add10, %mul9
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%exitcond = icmp ne i32 %add, %arg
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br i1 %exitcond, label %for.body, label %for.cond.cleanup
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}
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