[x86] add a convenience method to check for FMA capability; NFCI

[oota-llvm.git] / lib / Target / X86 / X86Subtarget.h

diff --git a/lib/Target/X86/X86Subtarget.h b/lib/Target/X86/X86Subtarget.h
index 425bc2482e9b8530a941b0b41b385625fc49a1df..353b4f7f5ebdef060288903cf3289dff736e3d74 100644 (file)
--- a/lib/Target/X86/X86Subtarget.h
+++ b/lib/Target/X86/X86Subtarget.h
@@ -354,9 +354,11 @@ public:
   bool hasXSAVEC() const { return HasXSAVEC; }
   bool hasXSAVES() const { return HasXSAVES; }
   bool hasPCLMUL() const { return HasPCLMUL; }
-  bool hasFMA() const { return HasFMA; }
-  // FIXME: Favor FMA when both are enabled. Is this the right thing to do?
-  bool hasFMA4() const { return HasFMA4 && !HasFMA; }
+  // Prefer FMA4 to FMA - its better for commutation/memory folding and
+  // has equal or better performance on all supported targets.
+  bool hasFMA() const { return HasFMA && !HasFMA4; }
+  bool hasFMA4() const { return HasFMA4; }
+  bool hasAnyFMA() const { return hasFMA() || hasFMA4() || hasAVX512(); }
   bool hasXOP() const { return HasXOP; }
   bool hasTBM() const { return HasTBM; }
   bool hasMOVBE() const { return HasMOVBE; }