[llvm] r364592 - [GVN] Add support for unary FNeg to GVN pass

[Cameron McInally via llvm-commits]

Author: mcinally
Date: Thu Jun 27 14:05:02 2019
New Revision: 364592

URL: http://llvm.org/viewvc/llvm-project?rev=364592&view=rev
Log:
[GVN] Add support for unary FNeg to GVN pass

Differential Revision: https://reviews.llvm.org/D63896

Modified:
    llvm/trunk/lib/Transforms/Scalar/GVN.cpp
    llvm/trunk/test/Transforms/GVN/fpmath.ll

Modified: llvm/trunk/lib/Transforms/Scalar/GVN.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Transforms/Scalar/GVN.cpp?rev=364592&r1=364591&r2=364592&view=diff
==============================================================================
--- llvm/trunk/lib/Transforms/Scalar/GVN.cpp (original)
+++ llvm/trunk/lib/Transforms/Scalar/GVN.cpp Thu Jun 27 14:05:02 2019
@@ -492,6 +492,7 @@ uint32_t GVN::ValueTable::lookupOrAdd(Va
   switch (I->getOpcode()) {
     case Instruction::Call:
       return lookupOrAddCall(cast<CallInst>(I));
+    case Instruction::FNeg:
     case Instruction::Add:
     case Instruction::FAdd:
     case Instruction::Sub:

Modified: llvm/trunk/test/Transforms/GVN/fpmath.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/Transforms/GVN/fpmath.ll?rev=364592&r1=364591&r2=364592&view=diff
==============================================================================
--- llvm/trunk/test/Transforms/GVN/fpmath.ll (original)
+++ llvm/trunk/test/Transforms/GVN/fpmath.ll Thu Jun 27 14:05:02 2019
@@ -43,9 +43,8 @@ define double @test4(double %x, double %
 
 define double @test5(double %x, double %y) {
 ; CHECK: @test5(double %x, double %y)
-; CHECK: %neg1 = fneg double %x, !fpmath !0
-; CHECK: %neg2 = fneg double %x, !fpmath !1
-; CHECK: %foo = fadd double %neg1, %neg2
+; CHECK: %neg1 = fneg double %x, !fpmath !1
+; CHECK: %foo = fadd double %neg1, %neg1
   %neg1 = fneg double %x, !fpmath !0
   %neg2 = fneg double %x, !fpmath !1
   %foo = fadd double %neg1, %neg2