Vector fneg must be expanded into fsub -0.0, X.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@40586 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/PowerPC/PPCInstrAltivec.td b/lib/Target/PowerPC/PPCInstrAltivec.td
index 572be98..7a404ad 100644
--- a/lib/Target/PowerPC/PPCInstrAltivec.td
+++ b/lib/Target/PowerPC/PPCInstrAltivec.td
@@ -70,7 +70,6 @@
return PPC::isVMRGHShuffleMask(N, 4, true);
}]>;
-
def VSLDOI_get_imm : SDNodeXForm<build_vector, [{
return getI32Imm(PPC::isVSLDOIShuffleMask(N, false));
}]>;
@@ -133,6 +132,10 @@
return PPC::get_VSPLTI_elt(N, 4, *CurDAG).Val != 0;
}], VSPLTISW_get_imm>;
+def V_immneg0 : PatLeaf<(build_vector), [{
+ return PPC::isAllNegativeZeroVector(N);
+}]>;
+
//===----------------------------------------------------------------------===//
// Helpers for defining instructions that directly correspond to intrinsics.
@@ -228,7 +231,8 @@
Requires<[FPContractions]>;
def VNMSUBFP: VAForm_1<47, (outs VRRC:$vD), (ins VRRC:$vA, VRRC:$vC, VRRC:$vB),
"vnmsubfp $vD, $vA, $vC, $vB", VecFP,
- [(set VRRC:$vD, (fneg (fsub (fmul VRRC:$vA, VRRC:$vC),
+ [(set VRRC:$vD, (fsub V_immneg0,
+ (fsub (fmul VRRC:$vA, VRRC:$vC),
VRRC:$vB)))]>,
Requires<[FPContractions]>;