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Fix PR14547. Handle induction variables of small sizes smaller than i32 (i8 and i16).

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llvm-svn: 172348
This commit is contained in:
Nadav Rotem 2013-01-13 07:56:29 +00:00
parent 1f32fece1e
commit c6cce40085
2 changed files with 38 additions and 0 deletions
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3
lib/Transforms/Vectorize/LoopVectorize.cpp
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@ -1033,11 +1033,14 @@ InnerLoopVectorizer::createEmptyLoop(LoopVectorizationLegality *Legal) {
// We may need to extend the index in case there is a type mismatch.
// We know that the count starts at zero and does not overflow.
unsigned IdxTyBW = IdxTy->getScalarSizeInBits();
if (Count->getType() != IdxTy) {
// The exit count can be of pointer type. Convert it to the correct
// integer type.
if (ExitCount->getType()->isPointerTy())
Count = CastInst::CreatePointerCast(Count, IdxTy, "ptrcnt.to.int", Loc);
else if (IdxTyBW < Count->getType()->getScalarSizeInBits())
Count = CastInst::CreateTruncOrBitCast(Count, IdxTy, "tr.cnt", Loc);
else
Count = CastInst::CreateZExtOrBitCast(Count, IdxTy, "zext.cnt", Loc);
}

35
test/Transforms/LoopVectorize/i8-induction.ll Normal file
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@ -0,0 +1,35 @@
; RUN: opt < %s -loop-vectorize -force-vector-unroll=1 -force-vector-width=4 -dce -instcombine -S
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"
target triple = "x86_64-apple-macosx10.8.0"
@a = common global i8 0, align 1
@b = common global i8 0, align 1
define void @f() nounwind uwtable ssp {
scalar.ph:
store i8 0, i8* inttoptr (i64 1 to i8*), align 1, !tbaa !0
%0 = load i8* @a, align 1, !tbaa !0
br label %for.body
for.body:
%mul16 = phi i8 [ 0, %scalar.ph ], [ %mul, %for.body ] ; <------- i8 induction var.
%c.015 = phi i8 [ undef, %scalar.ph ], [ %conv8, %for.body ]
%conv2 = sext i8 %c.015 to i32
%tobool = icmp ne i8 %c.015, 0
%.sink = select i1 %tobool, i8 %c.015, i8 %0
%mul = mul i8 %mul16, %.sink
%add = add nsw i32 %conv2, 1
%conv8 = trunc i32 %add to i8
%sext = shl i32 %add, 24
%phitmp14 = icmp slt i32 %sext, 268435456
br i1 %phitmp14, label %for.body, label %for.end
for.end: ; preds = %for.body
store i8 %mul, i8* @b, align 1, !tbaa !0
ret void
}
!0 = metadata !{metadata !"omnipotent char", metadata !1}
!1 = metadata !{metadata !"Simple C/C++ TBAA"}