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d693cafcfb
This patch adds DAG combines to form FMAs from pairs of FADD + FMUL or
FSUB + FMUL. The combines are performed when:
(a) Either
AllowExcessFPPrecision option (-enable-excess-fp-precision for llc)
OR
UnsafeFPMath option (-enable-unsafe-fp-math)
are set, and
(b) TargetLoweringInfo::isFMAFasterThanMulAndAdd(VT) is true for the type of
the FADD/FSUB, and
(c) The FMUL only has one user (the FADD/FSUB).
If your target has fast FMA instructions you can make use of these combines by
overriding TargetLoweringInfo::isFMAFasterThanMulAndAdd(VT) to return true for
types supported by your FMA instruction, and adding patterns to match ISD::FMA
to your FMA instructions.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@158757 91177308-0d34-0410-b5e6-96231b3b80d8
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| .. | ||
| bugpoint | ||
| bugpoint-passes | ||
| gold | ||
| llc | ||
| lli | ||
| llvm-ar | ||
| llvm-as | ||
| llvm-bcanalyzer | ||
| llvm-config | ||
| llvm-cov | ||
| llvm-diff | ||
| llvm-dis | ||
| llvm-dwarfdump | ||
| llvm-extract | ||
| llvm-link | ||
| llvm-mc | ||
| llvm-nm | ||
| llvm-objdump | ||
| llvm-prof | ||
| llvm-ranlib | ||
| llvm-readobj | ||
| llvm-rtdyld | ||
| llvm-shlib | ||
| llvm-size | ||
| llvm-stress | ||
| lto | ||
| macho-dump | ||
| opt | ||
| CMakeLists.txt | ||
| LLVMBuild.txt | ||
| Makefile | ||