commit 3546c1603a3e8c283dce5024d2a0b6614f1f3fbc
author Aleksandar Beserminji <Aleksandar.Beserminji@mips.com> Fri Apr 27 13:30:27 2018 +0000
committer Aleksandar Beserminji <Aleksandar.Beserminji@mips.com> Fri Apr 27 13:30:27 2018 +0000
tree 8c9899b4294beeaf118bdf68017d5531c4b0567d
parent f3632143da6610bcc4aaa9819ea7eaa58bd325de

[mips] Fix how compiler fuse instructions to fmadd/fmsub

This patch makes compiler does not fuse fmul and fadd/fsub into
fmadd/fmsub by default. Instead, -fp-contract=fast option can
be used when such behavior is desired.

Differential Revision: https://reviews.llvm.org/D46057

llvm-svn: 331033

llvm/lib/Target/Mips/MipsSEISelLowering.cpp

diff --git a/llvm/lib/Target/Mips/MipsSEISelLowering.cpp b/llvm/lib/Target/Mips/MipsSEISelLowering.cpp
index bfc6820..885c24f 100644
--- a/llvm/lib/Target/Mips/MipsSEISelLowering.cpp
+++ b/llvm/lib/Target/Mips/MipsSEISelLowering.cpp
@@ -1858,10 +1858,8 @@
   case Intrinsic::mips_fmsub_w:
   case Intrinsic::mips_fmsub_d: {
     // TODO: If intrinsics have fast-math-flags, propagate them.
-    EVT ResTy = Op->getValueType(0);
-    return DAG.getNode(ISD::FSUB, SDLoc(Op), ResTy, Op->getOperand(1),
-                       DAG.getNode(ISD::FMUL, SDLoc(Op), ResTy,
-                                   Op->getOperand(2), Op->getOperand(3)));
+    return DAG.getNode(MipsISD::FMS, SDLoc(Op), Op->getValueType(0),
+                       Op->getOperand(1), Op->getOperand(2), Op->getOperand(3));
   }
   case Intrinsic::mips_frint_w:
   case Intrinsic::mips_frint_d: