https://bugs.llvm.org/show_bug.cgi?id=44067
Bug ID: 44067
Summary: [SLPVectorizer] Generation of seed operands in the
wrong order for insertelement.
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: Scalar Optimizations
Assignee: unassignedb...@nondot.org
Reporter: v.porpo...@gmail.com
CC: a.bat...@hotmail.com, anton.a.afanas...@gmail.com,
llvm-bugs@lists.llvm.org, llvm-...@redking.me.uk,
spatel+l...@rotateright.com
There seems to be a bug in findBuildVector() when the insertelement
instructions are not in increasing index order.
For example:
%Ins1 = insertelement <2 x float> undef, float %Elem1, i32 1 ; NOTE: index=1
%Ins0 = insertelement <2 x float> %Ins1, float %Elem0, i32 0 ; NOTE: index=0
This generates a seed vector of %Elem1, %Elem0, but it should generate the
reverse: %Elem0, %Elem1.
Test:
----
define dso_local <2 x float> @foo({{float, float}}* %A, float %B) {
entry:
%0 = bitcast {{float, float}}* %A to <2 x float>*
%1 = load <2 x float>, <2 x float>* %0
%L0 = extractelement <2 x float> %1, i32 0
%L1 = extractelement <2 x float> %1, i32 1
%Mul0 = fmul float %L0, 2.000000e+00
%Mul1 = fmul float %L1, 2.000000e+00
%Ins1 = insertelement <2 x float> undef, float %Mul1, i32 1
%Ins0 = insertelement <2 x float> %Ins1, float %Mul0, i32 0
ret <2 x float> %Ins0
}
Compile:
----
opt -slp-vectorizer -S -mtriple=x86_64-unknown-linux-gnu test.ll
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