[TTI] Add getCacheLineSize
Summary:
And use it in PPCLoopDataPrefetch.cpp.
@hfinkel, please let me know if your preference would be to preserve the
ppc-loop-prefetch-cache-line option in order to be able to override the
value of TTI::getCacheLineSize for PPC.
Reviewers: hfinkel
Subscribers: hulx2000, mcrosier, mssimpso, hfinkel, llvm-commits
Differential Revision: http://reviews.llvm.org/D16306
llvm-svn: 258419
diff --git a/llvm/lib/Target/PowerPC/PPCTargetTransformInfo.cpp b/llvm/lib/Target/PowerPC/PPCTargetTransformInfo.cpp
index cd86dab..b60c07c 100644
--- a/llvm/lib/Target/PowerPC/PPCTargetTransformInfo.cpp
+++ b/llvm/lib/Target/PowerPC/PPCTargetTransformInfo.cpp
@@ -21,6 +21,12 @@
static cl::opt<bool> DisablePPCConstHoist("disable-ppc-constant-hoisting",
cl::desc("disable constant hoisting on PPC"), cl::init(false), cl::Hidden);
+// This is currently only used for the data prefetch pass which is only enabled
+// for BG/Q by default.
+static cl::opt<unsigned>
+CacheLineSize("ppc-loop-prefetch-cache-line", cl::Hidden, cl::init(64),
+ cl::desc("The loop prefetch cache line size"));
+
//===----------------------------------------------------------------------===//
//
// PPC cost model.
@@ -230,6 +236,12 @@
}
+unsigned PPCTTIImpl::getCacheLineSize() {
+ // This is currently only used for the data prefetch pass which is only
+ // enabled for BG/Q by default.
+ return CacheLineSize;
+}
+
unsigned PPCTTIImpl::getMaxInterleaveFactor(unsigned VF) {
unsigned Directive = ST->getDarwinDirective();
// The 440 has no SIMD support, but floating-point instructions