[PATCH] D144366: [RISCV]Add more pattern for fma ins

[Feng Wang via Phabricator via llvm-commits]

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Consider the following test cases:

double fma_1(double rs1, double rs2, double rs3)
{

  return  -(rs1 * rs2) - rs3;

}
double fma_2(double rs1, double rs2, double rs3)
{

  return  -(rs1 * rs2) + rs3;

}
The compiled assembly code with command --target=riscv64-unknown-elf
-march=rv64g is:
fma_1:
fneg.d	ft0, fa0
fmul.d	ft0, ft0, fa1
fsub.d	fa0, ft0, fa2
ret
fma_2:
fmul.d	ft0, fa0, fa1
fsub.d	fa0, fa2, ft0
ret
Compare with the gcc compiled result:
fma_1:
fnmadd.d  fa0,fa0,fa1,fa2
fma_2:
fnmsub.d  fa0,fa0,fa1,fa2
So I add new patterns for these two scenarios.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D144366

Files:
  lldb/include/lldb/Target/Target.h
  lldb/source/API/SBExpressionOptions.cpp
  lldb/source/Breakpoint/BreakpointLocation.cpp
  lldb/source/Commands/CommandObjectExpression.cpp
  lldb/source/Expression/UserExpression.cpp
  lldb/test/API/commands/expression/po_persistent_result/Makefile
  lldb/test/API/commands/expression/po_persistent_result/TestPoPersistentResult.py
  lldb/test/API/commands/expression/po_persistent_result/main.m
  llvm/lib/Target/RISCV/RISCVInstrInfoD.td
  llvm/lib/Target/RISCV/RISCVInstrInfoF.td
  llvm/test/CodeGen/RISCV/double-arith.ll
  llvm/test/CodeGen/RISCV/float-arith.ll

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