[PATCH] D34990: Fix endianness bug in DAGCombiner::visitTRUNCATE
Simon Dardis via Phabricator via llvm-commits
llvm-commits at lists.llvm.org
Wed Jul 5 10:26:55 PDT 2017
sdardis edited reviewers, added: sdardis; removed: llvm-commits.
sdardis added a comment.
You should upload patches with more context i.e. git diff -U9999.
I'm seeing the reported issue with MIPS, here's a testcase, you may need to file the rough edges off.
It can go in test/CodeGen/Mips/pr33682.ll
; RUN: llc -march=mips -mcpu=mips32 < %s | FileCheck --check-prefixes=ALL,BE
; RUN: llc -march=mipsel -mcpu=mips32 < %s | FileCheck --check-prefixes=ALL,LE
; Verify visitTRUNCATE respects endianness when transforming truncates to extract vector element.
; ALL-LABEL: a:
; BE: lw $2, 4($4)
; LE: lw $2, 0($4)
define i32 @a(<2 x i32> * %a) {
entry:
%0 = load <2 x i32>, <2 x i32> * %a
%1 = bitcast <2 x i32> %0 to i64
%2 = trunc i64 %1 to i32
ret i32 %2
}
https://reviews.llvm.org/D34990
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