[GISel]: Add Pattern Matcher for G_FMUL.

https://reviews.llvm.org/D43206

llvm-svn: 325044

2 files changed, 15 insertions, 0 deletions

diff --git a/llvm/include/llvm/CodeGen/GlobalISel/MIPatternMatch.h b/llvm/include/llvm/CodeGen/GlobalISel/MIPatternMatch.h
index caa21647688..c6c95462b28 100644
--- a/llvm/include/llvm/CodeGen/GlobalISel/MIPatternMatch.h
+++ b/llvm/include/llvm/CodeGen/GlobalISel/MIPatternMatch.h
@@ -202,6 +202,12 @@ m_GFAdd(const LHS &L, const RHS &R) {
   return BinaryOp_match<LHS, RHS, TargetOpcode::G_FADD, true>(L, R);
 }
 
+template <typename LHS, typename RHS>
+inline BinaryOp_match<LHS, RHS, TargetOpcode::G_FMUL, true>
+m_GFMul(const LHS &L, const RHS &R) {
+  return BinaryOp_match<LHS, RHS, TargetOpcode::G_FMUL, true>(L, R);
+}
+
 // Helper for unary instructions (G_[ZSA]EXT/G_TRUNC) etc
 template <typename SrcTy, unsigned Opcode> struct UnaryOp_match {
   SrcTy L;
diff --git a/llvm/unittests/CodeGen/GlobalISel/PatternMatchTest.cpp b/llvm/unittests/CodeGen/GlobalISel/PatternMatchTest.cpp
index dd26e9b11fe..dc41e5425d4 100644
--- a/llvm/unittests/CodeGen/GlobalISel/PatternMatchTest.cpp
+++ b/llvm/unittests/CodeGen/GlobalISel/PatternMatchTest.cpp
@@ -201,6 +201,15 @@ TEST(PatternMatchInstr, MatchBinaryOp) {
   match = mi_match(MIBSub->getOperand(0).getReg(), MRI,
                    m_GSub(m_ICst(Cst), m_Reg(Src0)));
   ASSERT_FALSE(match);
+
+  auto MIBFMul = B.buildInstr(TargetOpcode::G_FMUL, s64, Copies[0],
+                              B.buildConstant(s64, 42));
+  // Match and test commutativity for FMUL.
+  match = mi_match(MIBFMul->getOperand(0).getReg(), MRI,
+                   m_GFMul(m_ICst(Cst), m_Reg(Src0)));
+  ASSERT_TRUE(match);
+  ASSERT_EQ(Cst, (uint64_t)42);
+  ASSERT_EQ(Src0, Copies[0]);
 }
 
 TEST(PatternMatchInstr, MatchExtendsTrunc) {