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| author | Vincent Lejeune <vljn@ovi.com> | 2013-10-13 17:56:10 +0000 |
|---|---|---|
| committer | Vincent Lejeune <vljn@ovi.com> | 2013-10-13 17:56:10 +0000 |
| commit | f2b3a569ae25dbba264cef93602b4147d2a723d6 (patch) | |
| tree | 857095c64034e715e31ce2dcd5e14b7b1af4c5e8 /lib/Target | |
| parent | 91ec4b0cac7a7476a9d30d6f1adbf218ee6673a0 (diff) | |
| download | external_llvm-f2b3a569ae25dbba264cef93602b4147d2a723d6.zip external_llvm-f2b3a569ae25dbba264cef93602b4147d2a723d6.tar.gz external_llvm-f2b3a569ae25dbba264cef93602b4147d2a723d6.tar.bz2 | |
R600: Use masked read sel for texture instructions
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@192554 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Target')
| -rw-r--r-- | lib/Target/R600/R600ISelLowering.cpp | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/lib/Target/R600/R600ISelLowering.cpp b/lib/Target/R600/R600ISelLowering.cpp index 81a28be..3c2e388 100644 --- a/lib/Target/R600/R600ISelLowering.cpp +++ b/lib/Target/R600/R600ISelLowering.cpp @@ -1379,6 +1379,11 @@ CompactSwizzlableVector(SelectionDAG &DAG, SDValue VectorEntry, }; for (unsigned i = 0; i < 4; i++) { + if (NewBldVec[i].getOpcode() == ISD::UNDEF) + // We mask write here to teach later passes that the ith element of this + // vector is undef. Thus we can use it to reduce 128 bits reg usage, + // break false dependencies and additionnaly make assembly easier to read. + RemapSwizzle[i] = 7; // SEL_MASK_WRITE if (ConstantFPSDNode *C = dyn_cast<ConstantFPSDNode>(NewBldVec[i])) { if (C->isZero()) { RemapSwizzle[i] = 4; // SEL_0 |