From c27ff0d32db8662c8b1c0ab4ea611bc541fdb19f Mon Sep 17 00:00:00 2001
From: Hiroshi Yamauchi <yamauchi@google.com>
Date: Fri, 12 Apr 2019 15:05:46 +0000
Subject: [PATCH] Add options for MaxLoadsPerMemcmp(OptSize).

Reviewers: davidxl

Reviewed By: davidxl

Subscribers: llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D60587

llvm-svn: 358287
---
 llvm/lib/CodeGen/ExpandMemCmp.cpp | 17 +++++++++++++++--
 1 file changed, 15 insertions(+), 2 deletions(-)

diff --git a/llvm/lib/CodeGen/ExpandMemCmp.cpp b/llvm/lib/CodeGen/ExpandMemCmp.cpp
index 6c80c170ce81..a3a979008dc0 100644
--- a/llvm/lib/CodeGen/ExpandMemCmp.cpp
+++ b/llvm/lib/CodeGen/ExpandMemCmp.cpp
@@ -36,6 +36,14 @@ static cl::opt<unsigned> MemCmpEqZeroNumLoadsPerBlock(
     cl::desc("The number of loads per basic block for inline expansion of "
              "memcmp that is only being compared against zero."));
 
+static cl::opt<unsigned> MaxLoadsPerMemcmp(
+    "max-loads-per-memcmp", cl::Hidden,
+    cl::desc("Set maximum number of loads used in expanded memcmp"));
+
+static cl::opt<unsigned> MaxLoadsPerMemcmpOptSize(
+    "max-loads-per-memcmp-opt-size", cl::Hidden,
+    cl::desc("Set maximum number of loads used in expanded memcmp for -Os/Oz"));
+
 namespace {
 
 
@@ -741,8 +749,13 @@ static bool expandMemCmp(CallInst *CI, const TargetTransformInfo *TTI,
   const auto *const Options = TTI->enableMemCmpExpansion(IsUsedForZeroCmp);
   if (!Options) return false;
 
-  const unsigned MaxNumLoads =
-      TLI->getMaxExpandSizeMemcmp(CI->getFunction()->hasOptSize());
+  const unsigned MaxNumLoads = CI->getFunction()->hasOptSize()
+      ? (MaxLoadsPerMemcmpOptSize.getNumOccurrences()
+         ? MaxLoadsPerMemcmpOptSize
+         : TLI->getMaxExpandSizeMemcmp(true))
+      : (MaxLoadsPerMemcmp.getNumOccurrences()
+         ? MaxLoadsPerMemcmp
+         : TLI->getMaxExpandSizeMemcmp(false));
 
   unsigned NumLoadsPerBlock = MemCmpEqZeroNumLoadsPerBlock.getNumOccurrences()
                                   ? MemCmpEqZeroNumLoadsPerBlock