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| author | Stanislav Mekhanoshin <Stanislav.Mekhanoshin@amd.com> | 2019-10-22 11:07:15 -0700 |
|---|---|---|
| committer | Stanislav Mekhanoshin <Stanislav.Mekhanoshin@amd.com> | 2019-10-22 11:27:36 -0700 |
| commit | 48f57138be55a939afc64d357f7b26220206127a (patch) | |
| tree | 2ca3176f861ebfc0ae3f34aa6552471db6dd0e2b /llvm/lib/Target | |
| parent | 19ca80ef0575b376e135271c7d44799803407941 (diff) | |
| download | bcm5719-llvm-48f57138be55a939afc64d357f7b26220206127a.tar.gz bcm5719-llvm-48f57138be55a939afc64d357f7b26220206127a.zip | |
[AMDGPU] Allow tied operand subreg folding
Turns out it makes sense, contrarily to what comment said.
Differential Revision: https://reviews.llvm.org/D69287
Diffstat (limited to 'llvm/lib/Target')
| -rw-r--r-- | llvm/lib/Target/AMDGPU/SIFoldOperands.cpp | 12 |
1 files changed, 0 insertions, 12 deletions
diff --git a/llvm/lib/Target/AMDGPU/SIFoldOperands.cpp b/llvm/lib/Target/AMDGPU/SIFoldOperands.cpp index 4eac0316876..69ac367f7ab 100644 --- a/llvm/lib/Target/AMDGPU/SIFoldOperands.cpp +++ b/llvm/lib/Target/AMDGPU/SIFoldOperands.cpp @@ -513,18 +513,6 @@ void SIFoldOperands::foldOperand( if (UseOp.isReg() && OpToFold.isReg()) { if (UseOp.isImplicit() || UseOp.getSubReg() != AMDGPU::NoSubRegister) return; - - // Don't fold subregister extracts into tied operands, only if it is a full - // copy since a subregister use tied to a full register def doesn't really - // make sense. e.g. don't fold: - // - // %1 = COPY %0:sub1 - // %2<tied3> = V_MAC_{F16, F32} %3, %4, %1<tied0> - // - // into - // %2<tied3> = V_MAC_{F16, F32} %3, %4, %0:sub1<tied0> - if (UseOp.isTied() && OpToFold.getSubReg() != AMDGPU::NoSubRegister) - return; } // Special case for REG_SEQUENCE: We can't fold literals into |
