[all-commits] [llvm/llvm-project] 1b5774: [PowerPC] stop folding if result rlwinm mask is wr...
chen zheng via All-commits
all-commits at lists.llvm.org
Wed Dec 25 18:56:35 PST 2019
Branch: refs/heads/master
Home: https://github.com/llvm/llvm-project
Commit: 1b57749a5334ae3d854c6f8732e741ef9f977219
https://github.com/llvm/llvm-project/commit/1b57749a5334ae3d854c6f8732e741ef9f977219
Author: czhengsz <czhengsz at cn.ibm.com>
Date: 2019-12-25 (Wed, 25 Dec 2019)
Changed paths:
M llvm/lib/Target/PowerPC/PPCMIPeephole.cpp
M llvm/test/CodeGen/PowerPC/fold-rlwinm.mir
Log Message:
-----------
[PowerPC] stop folding if result rlwinm mask is wrap while original rlwinm is not.
%1:g8rc = RLWINM8 %0:g8rc, 0, 16, 9
%2:g8rc = RLWINM8 killed %1:g8rc, 0, 0, 31
->
%2:g8rc = RLWINM8 %0:g8rc, 0, 16, 9
The above folding is wrong. Before transformation, %2:g8rc is 32 bit value. After
transformation, %2:g8rc becomes a 64 bit value.
This patch fixes above issue.
Reviewed by: steven.zhang
Differential Revision: https://reviews.llvm.org/D71833
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