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Summary

  1. [CodeGen] [ExpandReduction] Fix the bug for ExpandReduction() when (details)
Commit 4e9778e346f27b09724f39f92b34dd7336c2147a by shkzhang
[CodeGen] [ExpandReduction] Fix the bug for ExpandReduction() when
vector size isn't power of 2
Summary: For below test case, we will get assert error except for
AArch64 and ARM:
declare i8 @llvm.experimental.vector.reduce.and.i8.v3i8(<3 x i8> %a)
define i8 @test_v3i8(<3 x i8> %a) nounwind {
%b = call i8 @llvm.experimental.vector.reduce.and.i8.v3i8(<3 x i8> %a)
ret i8 %b
} In the function getShuffleReduction (), we can see it needs the vector
size must be power of 2.
This patch is fix below error when the number of element is not power of
2 for those llvm.experimental.vector.reduce.* function.
Reviewed By: jsji
Differential Revision: https://reviews.llvm.org/D68625
The file was modifiedllvm/lib/CodeGen/ExpandReductions.cpp
The file was modifiedllvm/test/CodeGen/Generic/expand-experimental-reductions.ll