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| author | Jakob Stoklund Olesen <stoklund@2pi.dk> | 2012-03-29 22:54:32 +0000 |
|---|---|---|
| committer | Jakob Stoklund Olesen <stoklund@2pi.dk> | 2012-03-29 22:54:32 +0000 |
| commit | ccca22e9e2e03bdd782b1d4bf880ebf79e7b7e77 (patch) | |
| tree | c7f2ade13f13dff287c6de4ce048c04aac92608f | |
| parent | 803d1340070ecc330376076326c72276ca58b0bf (diff) | |
| download | external_llvm-ccca22e9e2e03bdd782b1d4bf880ebf79e7b7e77.zip external_llvm-ccca22e9e2e03bdd782b1d4bf880ebf79e7b7e77.tar.gz external_llvm-ccca22e9e2e03bdd782b1d4bf880ebf79e7b7e77.tar.bz2 | |
Prefer even-odd D-register pairs.
We are sometimes allocatinog from the DPair register class which
contains odd-even pairs in addition to the Q registers.
Place the Q registers first in the DPair allocation order as they can be
copied with a single instruction. The odd-even pairs should only be
allocated as a last resort.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@153699 91177308-0d34-0410-b5e6-96231b3b80d8
| -rw-r--r-- | lib/Target/ARM/ARMRegisterInfo.td | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/lib/Target/ARM/ARMRegisterInfo.td b/lib/Target/ARM/ARMRegisterInfo.td index 1327fb8..1466e98 100644 --- a/lib/Target/ARM/ARMRegisterInfo.td +++ b/lib/Target/ARM/ARMRegisterInfo.td @@ -314,7 +314,8 @@ def TuplesOE2D : RegisterTuples<[dsub_0, dsub_1], def DPair : RegisterClass<"ARM", [v16i8, v8i16, v4i32, v2i64, v4f32, v2f64], 128, (interleave QPR, TuplesOE2D)> { // Allocate starting at non-VFP2 registers D16-D31 first. - let AltOrders = [(rotl DPair, 16)]; + // Prefer even-odd pairs as they are easier to copy. + let AltOrders = [(add (rotl QPR, 8), (rotl DPair, 16))]; let AltOrderSelect = [{ return 1; }]; } |