[all-commits] [llvm/llvm-project] 0176fe: [SVE][CodeGen] Expand SVE MULH[SU] and [SU]MUL_LOH...
Fraser Cormack via All-commits
all-commits at lists.llvm.org
Thu Feb 18 02:12:55 PST 2021
Branch: refs/heads/main
Home: https://github.com/llvm/llvm-project
Commit: 0176fecfbcd6b867fd31d7b85cc748220150babc
https://github.com/llvm/llvm-project/commit/0176fecfbcd6b867fd31d7b85cc748220150babc
Author: Fraser Cormack <fraser at codeplay.com>
Date: 2021-02-18 (Thu, 18 Feb 2021)
Changed paths:
M llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
M llvm/test/CodeGen/AArch64/sve-int-arith-imm.ll
Log Message:
-----------
[SVE][CodeGen] Expand SVE MULH[SU] and [SU]MUL_LOHI nodes
This patch fixes a codegen crash introduced in fde24661718c, where the
DAGCombiner started generating optimized MULH[SU] or [SU]MUL_LOHI nodes
unless the target opted out. The AArch64 backend cannot currently select
any of these nodes, so ensure that they are not generated in the first
place.
This issue was raised by @huihuiz in D94501.
Reviewed By: paulwalker-arm
Differential Revision: https://reviews.llvm.org/D96849
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