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author | Dimitry Andric <dim@FreeBSD.org> | 2018-07-28 10:51:19 +0000 |
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committer | Dimitry Andric <dim@FreeBSD.org> | 2018-07-28 10:51:19 +0000 |
commit | eb11fae6d08f479c0799db45860a98af528fa6e7 (patch) | |
tree | 44d492a50c8c1a7eb8e2d17ea3360ec4d066f042 /lib/CodeGen/GlobalISel/CombinerHelper.cpp | |
parent | b8a2042aa938069e862750553db0e4d82d25822c (diff) | |
download | src-eb11fae6d08f479c0799db45860a98af528fa6e7.tar.gz src-eb11fae6d08f479c0799db45860a98af528fa6e7.zip |
Vendor import of llvm trunk r338150:vendor/llvm/llvm-trunk-r338150
Notes
Notes:
svn path=/vendor/llvm/dist/; revision=336809
svn path=/vendor/llvm/llvm-trunk-r338150/; revision=336814; tag=vendor/llvm/llvm-trunk-r338150
Diffstat (limited to 'lib/CodeGen/GlobalISel/CombinerHelper.cpp')
-rw-r--r-- | lib/CodeGen/GlobalISel/CombinerHelper.cpp | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/lib/CodeGen/GlobalISel/CombinerHelper.cpp b/lib/CodeGen/GlobalISel/CombinerHelper.cpp new file mode 100644 index 000000000000..44e904a6391b --- /dev/null +++ b/lib/CodeGen/GlobalISel/CombinerHelper.cpp @@ -0,0 +1,41 @@ +//== ---lib/CodeGen/GlobalISel/GICombinerHelper.cpp --------------------- == // +// +// The LLVM Compiler Infrastructure +// +// This file is distributed under the University of Illinois Open Source +// License. See LICENSE.TXT for details. +// +//===----------------------------------------------------------------------===// +#include "llvm/CodeGen/GlobalISel/CombinerHelper.h" +#include "llvm/CodeGen/GlobalISel/MachineIRBuilder.h" +#include "llvm/CodeGen/GlobalISel/Utils.h" +#include "llvm/CodeGen/MachineInstr.h" +#include "llvm/CodeGen/MachineRegisterInfo.h" + +#define DEBUG_TYPE "gi-combine" + +using namespace llvm; + +CombinerHelper::CombinerHelper(MachineIRBuilder &B) : + Builder(B), MRI(Builder.getMF().getRegInfo()) {} + +bool CombinerHelper::tryCombineCopy(MachineInstr &MI) { + if (MI.getOpcode() != TargetOpcode::COPY) + return false; + unsigned DstReg = MI.getOperand(0).getReg(); + unsigned SrcReg = MI.getOperand(1).getReg(); + LLT DstTy = MRI.getType(DstReg); + LLT SrcTy = MRI.getType(SrcReg); + // Simple Copy Propagation. + // a(sx) = COPY b(sx) -> Replace all uses of a with b. + if (DstTy.isValid() && SrcTy.isValid() && DstTy == SrcTy) { + MI.eraseFromParent(); + MRI.replaceRegWith(DstReg, SrcReg); + return true; + } + return false; +} + +bool CombinerHelper::tryCombine(MachineInstr &MI) { + return tryCombineCopy(MI); +} |