forked from OSchip/llvm-project
2038747fce
Summary:
One of the vector splitting paths for extract_vector_elt tries to lower:
define i1 @via_stack_bug(i8 signext %idx) {
%1 = extractelement <2 x i1> <i1 false, i1 true>, i8 %idx
ret i1 %1
}
to:
define i1 @via_stack_bug(i8 signext %idx) {
%base = alloca <2 x i1>
store <2 x i1> <i1 false, i1 true>, <2 x i1>* %base
%2 = getelementptr <2 x i1>, <2 x i1>* %base, i32 %idx
%3 = load i1, i1* %2
ret i1 %3
}
However, the elements of <2 x i1> are not byte-addressible. The result of this
is that the getelementptr expands to '%base + %idx * (1 / 8)' which simplifies
to '%base + %idx * 0', and then simply '%base' causing all values of %idx to
extract element zero.
This commit fixes this by promoting the vector elements of <8-bits to i8 before
splitting the vector.
This fixes a number of test failures in pocl.
Reviewers: pekka.jaaskelainen
Subscribers: pekka.jaaskelainen, llvm-commits
Differential Revision: http://reviews.llvm.org/D12591
llvm-svn: 247128
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| .. | ||
| add.ll | ||
| addrspacecast.ll | ||
| and.ll | ||
| ashr.ll | ||
| call.ll | ||
| extractelement.ll | ||
| indirectbr.ll | ||
| lshr.ll | ||
| mul.ll | ||
| or.ll | ||
| ret.ll | ||
| sdiv.ll | ||
| select.ll | ||
| shl.ll | ||
| srem.ll | ||
| sub.ll | ||
| udiv.ll | ||
| urem.ll | ||
| xor.ll | ||