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| author | Akira Hatanaka <ahatanaka@mips.com> | 2013-03-01 21:52:08 +0000 |
|---|---|---|
| committer | Akira Hatanaka <ahatanaka@mips.com> | 2013-03-01 21:52:08 +0000 |
| commit | ee767fe2d2d742630d2fd40f91f3c54e35cc0668 (patch) | |
| tree | 0407bf7c3b6a31ce8b0bb7da15799b74fd46a323 /lib/Target/Mips/MipsInstrInfo.td | |
| parent | c2171eb3ffb0aaa845de15437cadf2a298f1ea61 (diff) | |
| download | external_llvm-ee767fe2d2d742630d2fd40f91f3c54e35cc0668.zip external_llvm-ee767fe2d2d742630d2fd40f91f3c54e35cc0668.tar.gz external_llvm-ee767fe2d2d742630d2fd40f91f3c54e35cc0668.tar.bz2 | |
[mips] Fix inefficient code generation.
This patch eliminates the need to emit a constant move instruction when this
pattern is matched:
(select (setgt a, Constant), T, F)
The pattern above effectively turns into this:
(conditional-move (setlt a, Constant + 1), F, T)
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@176384 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Target/Mips/MipsInstrInfo.td')
| -rw-r--r-- | lib/Target/Mips/MipsInstrInfo.td | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/lib/Target/Mips/MipsInstrInfo.td b/lib/Target/Mips/MipsInstrInfo.td index de09c9e..b71ced1 100644 --- a/lib/Target/Mips/MipsInstrInfo.td +++ b/lib/Target/Mips/MipsInstrInfo.td @@ -299,6 +299,9 @@ def HI16 : SDNodeXForm<imm, [{ return getImm(N, (N->getZExtValue() >> 16) & 0xFFFF); }]>; +// Plus 1. +def Plus1 : SDNodeXForm<imm, [{ return getImm(N, N->getSExtValue() + 1); }]>; + // Node immediate fits as 16-bit sign extended on target immediate. // e.g. addi, andi def immSExt8 : PatLeaf<(imm), [{ return isInt<8>(N->getSExtValue()); }]>; @@ -331,6 +334,11 @@ def immLow16Zero : PatLeaf<(imm), [{ // shamt field must fit in 5 bits. def immZExt5 : ImmLeaf<i32, [{return Imm == (Imm & 0x1f);}]>; +// True if (N + 1) fits in 16-bit field. +def immSExt16Plus1 : PatLeaf<(imm), [{ + return isInt<17>(N->getSExtValue()) && isInt<16>(N->getSExtValue() + 1); +}]>; + // Mips Address Mode! SDNode frameindex could possibily be a match // since load and store instructions from stack used it. def addr : |