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When forming an ICmpZero LSRUse, normalize the non-IV operand

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of the comparison, so that the resulting expression is fully
normalized. This fixes PR9939.

llvm-svn: 131576
This commit is contained in:
Dan Gohman 2011-05-18 21:02:18 +00:00
parent f1e313af0f
commit 13dc3428b9
2 changed files with 95 additions and 0 deletions
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4
lib/Transforms/Scalar/LoopStrengthReduce.cpp
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@ -2073,6 +2073,10 @@ void LSRInstance::CollectFixupsAndInitialFormulae() {
// x == y --> x - y == 0
const SCEV *N = SE.getSCEV(NV);
if (SE.isLoopInvariant(N, L)) {
// S is normalized, so normalize N before folding it into S
// to keep the result normalized.
N = TransformForPostIncUse(Normalize, N, CI, 0,
LF.PostIncLoops, SE, DT);
Kind = LSRUse::ICmpZero;
S = SE.getMinusSCEV(N, S);
}

91
test/Transforms/LoopStrengthReduce/post-inc-icmpzero.ll Normal file
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@ -0,0 +1,91 @@
; RUN: opt -loop-reduce -S < %s | FileCheck %s
; PR9939
; LSR should property handle the post-inc offset when folding the
; non-IV operand of an icmp into the IV.
; CHECK: %tmp2 = sub i64 %sub.ptr.lhs.cast, %sub.ptr.rhs.cast
; CHECK: %tmp3 = lshr i64 %tmp2, 1
; CHECK: %tmp4 = mul i64 %tmp3, 2
; CHECK: br label %for.body
; CHECK: for.body:
; CHECK: %lsr.iv5 = phi i64 [ %lsr.iv.next, %for.body ], [ %tmp4, %for.body.lr.ph ]
; CHECK: %lsr.iv.next = add i64 %lsr.iv5, -2
; CHECK: %lsr.iv.next6 = inttoptr i64 %lsr.iv.next to i16*
; CHECK: %cmp27 = icmp eq i16* %lsr.iv.next6, null
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"
target triple = "x86_64-unknown-linux-gnu"
%struct.Vector2 = type { i16*, [64 x i16], i32 }
@.str = private unnamed_addr constant [37 x i8] c"0123456789abcdefghijklmnopqrstuvwxyz\00"
define void @_Z15IntegerToStringjjR7Vector2(i32 %i, i32 %radix, %struct.Vector2* nocapture %result) nounwind noinline {
entry:
%buffer = alloca [33 x i16], align 16
%add.ptr = getelementptr inbounds [33 x i16]* %buffer, i64 0, i64 33
br label %do.body
do.body: ; preds = %do.body, %entry
%0 = phi i64 [ %indvar.next44, %do.body ], [ 0, %entry ]
%i.addr.0 = phi i32 [ %div, %do.body ], [ %i, %entry ]
%tmp51 = sub i64 32, %0
%incdec.ptr = getelementptr [33 x i16]* %buffer, i64 0, i64 %tmp51
%rem = urem i32 %i.addr.0, 10
%div = udiv i32 %i.addr.0, 10
%idxprom = zext i32 %rem to i64
%arrayidx = getelementptr inbounds [37 x i8]* @.str, i64 0, i64 %idxprom
%tmp5 = load i8* %arrayidx, align 1
%conv = sext i8 %tmp5 to i16
store i16 %conv, i16* %incdec.ptr, align 2
%1 = icmp ugt i32 %i.addr.0, 9
%indvar.next44 = add i64 %0, 1
br i1 %1, label %do.body, label %do.end
do.end: ; preds = %do.body
%xap.0 = inttoptr i64 %0 to i1*
%cap.0 = ptrtoint i1* %xap.0 to i64
%sub.ptr.lhs.cast = ptrtoint i16* %add.ptr to i64
%sub.ptr.rhs.cast = ptrtoint i16* %incdec.ptr to i64
%sub.ptr.sub = sub i64 %sub.ptr.lhs.cast, %sub.ptr.rhs.cast
%sub.ptr.div39 = lshr exact i64 %sub.ptr.sub, 1
%conv11 = trunc i64 %sub.ptr.div39 to i32
%mLength = getelementptr inbounds %struct.Vector2* %result, i64 0, i32 2
%idx.ext21 = bitcast i64 %sub.ptr.div39 to i64
%incdec.ptr.sum = add i64 %idx.ext21, -1
%cp.0.sum = sub i64 %incdec.ptr.sum, %0
%add.ptr22 = getelementptr [33 x i16]* %buffer, i64 1, i64 %cp.0.sum
%cmp2740 = icmp eq i64 %idx.ext21, 0
br i1 %cmp2740, label %for.end, label %for.body.lr.ph
for.body.lr.ph: ; preds = %do.end
%tmp16 = load i32* %mLength, align 4
%mBegin = getelementptr inbounds %struct.Vector2* %result, i64 0, i32 0
%tmp14 = load i16** %mBegin, align 8
%tmp48 = zext i32 %tmp16 to i64
br label %for.body
for.body: ; preds = %for.body, %for.body.lr.ph
%indvar = phi i64 [ 0, %for.body.lr.ph ], [ %indvar.next, %for.body ]
%tmp46 = add i64 %tmp51, %indvar
%p.042 = getelementptr [33 x i16]* %buffer, i64 0, i64 %tmp46
%tmp47 = sub i64 %indvar, %0
%incdec.ptr32 = getelementptr [33 x i16]* %buffer, i64 1, i64 %tmp47
%tmp49 = add i64 %tmp48, %indvar
%dst.041 = getelementptr i16* %tmp14, i64 %tmp49
%tmp29 = load i16* %p.042, align 2
store i16 %tmp29, i16* %dst.041, align 2
%cmp27 = icmp eq i16* %incdec.ptr32, %add.ptr22
%indvar.next = add i64 %indvar, 1
br i1 %cmp27, label %for.end.loopexit, label %for.body
for.end.loopexit: ; preds = %for.body
br label %for.end
for.end: ; preds = %for.end.loopexit, %do.end
%tmp38 = load i32* %mLength, align 4
%add = add i32 %tmp38, %conv11
store i32 %add, i32* %mLength, align 4
ret void
}