[llvm] r178658 - PPC: Add a FIXME regarding the non-working fma+fneg Altivec pattern

[Hal Finkel]

Author: hfinkel
Date: Wed Apr  3 09:40:16 2013
New Revision: 178658

URL: http://llvm.org/viewvc/llvm-project?rev=178658&view=rev
Log:
PPC: Add a FIXME regarding the non-working fma+fneg Altivec pattern

Modified:
    llvm/trunk/lib/Target/PowerPC/PPCInstrAltivec.td

Modified: llvm/trunk/lib/Target/PowerPC/PPCInstrAltivec.td
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/PowerPC/PPCInstrAltivec.td?rev=178658&r1=178657&r2=178658&view=diff
==============================================================================
--- llvm/trunk/lib/Target/PowerPC/PPCInstrAltivec.td (original)
+++ llvm/trunk/lib/Target/PowerPC/PPCInstrAltivec.td Wed Apr  3 09:40:16 2013
@@ -318,6 +318,8 @@ def VMADDFP : VAForm_1<46, (outs VRRC:$v
                        "vmaddfp $vD, $vA, $vC, $vB", VecFP,
                        [(set v4f32:$vD,
                         (fma v4f32:$vA, v4f32:$vC, v4f32:$vB))]>;
+
+// FIXME: The fma+fneg pattern won't match because fneg is not legal.
 def VNMSUBFP: VAForm_1<47, (outs VRRC:$vD), (ins VRRC:$vA, VRRC:$vC, VRRC:$vB),
                        "vnmsubfp $vD, $vA, $vC, $vB", VecFP,
                        [(set v4f32:$vD, (fneg (fma v4f32:$vA, v4f32:$vC,