[PATCH] D100463: [AArch64][SVEIntrinsicOpts] Fold sve_convert_from_svbool(zero) to zero
Joe Ellis via Phabricator via llvm-commits
llvm-commits at lists.llvm.org
Wed Apr 14 04:13:32 PDT 2021
joechrisellis created this revision.
joechrisellis added reviewers: paulwalker-arm, kmclaughlin, bsmith, DavidTruby.
Herald added subscribers: hiraditya, kristof.beyls, tschuett.
joechrisellis requested review of this revision.
Herald added a project: LLVM.
Herald added a subscriber: llvm-commits.
Co-authored-by: Paul Walker <paul.walker at arm.com>
Repository:
rG LLVM Github Monorepo
https://reviews.llvm.org/D100463
Files:
llvm/lib/Target/AArch64/SVEIntrinsicOpts.cpp
llvm/test/CodeGen/AArch64/sve-intrinsic-opts-reinterpret.ll
Index: llvm/test/CodeGen/AArch64/sve-intrinsic-opts-reinterpret.ll
===================================================================
--- llvm/test/CodeGen/AArch64/sve-intrinsic-opts-reinterpret.ll
+++ llvm/test/CodeGen/AArch64/sve-intrinsic-opts-reinterpret.ll
@@ -251,6 +251,13 @@
ret <vscale x 16 x i1> %pg
}
+define <vscale x 2 x i1> @reinterpret_zero() {
+; OPT-LABEL: @reinterpret_zero(
+; OPT: ret <vscale x 2 x i1> zeroinitializer
+ %pg = tail call <vscale x 2 x i1> @llvm.aarch64.sve.convert.from.svbool.nxv2i1(<vscale x 16 x i1> zeroinitializer)
+ ret <vscale x 2 x i1> %pg
+}
+
declare <vscale x 16 x i1> @llvm.aarch64.sve.convert.to.svbool.nxv8i1(<vscale x 8 x i1>)
declare <vscale x 16 x i1> @llvm.aarch64.sve.convert.to.svbool.nxv4i1(<vscale x 4 x i1>)
declare <vscale x 16 x i1> @llvm.aarch64.sve.convert.to.svbool.nxv2i1(<vscale x 2 x i1>)
Index: llvm/lib/Target/AArch64/SVEIntrinsicOpts.cpp
===================================================================
--- llvm/lib/Target/AArch64/SVEIntrinsicOpts.cpp
+++ llvm/lib/Target/AArch64/SVEIntrinsicOpts.cpp
@@ -481,6 +481,15 @@
if (isa<PHINode>(I->getArgOperand(0)))
return processPhiNode(I);
+ if (auto *C = dyn_cast<Constant>(I->getArgOperand(0))) {
+ if (!C->isNullValue())
+ return false;
+
+ I->replaceAllUsesWith(ConstantInt::getFalse(I->getType()));
+ I->eraseFromParent();
+ return true;
+ }
+
SmallVector<Instruction *, 32> CandidatesForRemoval;
Value *Cursor = I->getOperand(0), *EarliestReplacement = nullptr;
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