[X86MacroFusion] Handle branch fusion (AMD CPUs).

Summary:
This adds a BranchFusion feature to replace the usage of the MacroFusion
for AMD CPUs.

See D59688 for context.

Reviewers: andreadb, lebedev.ri

Subscribers: hiraditya, jdoerfert, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D59872

llvm-svn: 357171

1 files changed, 4 insertions, 0 deletions

diff --git a/llvm/lib/Target/X86/X86Subtarget.h b/llvm/lib/Target/X86/X86Subtarget.h
index 8d330fa6f9a..2bd36d42c5c 100644
--- a/llvm/lib/Target/X86/X86Subtarget.h
+++ b/llvm/lib/Target/X86/X86Subtarget.h
@@ -297,6 +297,9 @@ protected:
   /// True if the processor supports macrofusion.
   bool HasMacroFusion = false;
 
+  /// True if the processor supports branch fusion.
+  bool HasBranchFusion = false;
+
   /// True if the processor has enhanced REP MOVSB/STOSB.
   bool HasERMSB = false;
 
@@ -642,6 +645,7 @@ public:
   bool hasFastBEXTR() const { return HasFastBEXTR; }
   bool hasFastHorizontalOps() const { return HasFastHorizontalOps; }
   bool hasMacroFusion() const { return HasMacroFusion; }
+  bool hasBranchFusion() const { return HasBranchFusion; }
   bool hasERMSB() const { return HasERMSB; }
   bool hasSlowDivide32() const { return HasSlowDivide32; }
   bool hasSlowDivide64() const { return HasSlowDivide64; }