need to fix 'make check' tests first. revert for a moment.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@99569 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/ARM/ARMSubtarget.cpp b/lib/Target/ARM/ARMSubtarget.cpp
index 9e55cd8..76ed66f 100644
--- a/lib/Target/ARM/ARMSubtarget.cpp
+++ b/lib/Target/ARM/ARMSubtarget.cpp
@@ -22,6 +22,10 @@
static cl::opt<bool>
ReserveR9("arm-reserve-r9", cl::Hidden,
cl::desc("Reserve R9, making it unavailable as GPR"));
+static cl::opt<bool>
+UseNEONFP("arm-use-neon-fp",
+ cl::desc("Use NEON for single-precision FP"),
+ cl::init(false), cl::Hidden);
static cl::opt<bool>
UseMOVT("arm-use-movt",
@@ -31,7 +35,7 @@
bool isT)
: ARMArchVersion(V4)
, ARMFPUType(None)
- , UseNEONForSinglePrecisionFP(false)
+ , UseNEONForSinglePrecisionFP(UseNEONFP)
, SlowVMLx(false)
, IsThumb(isT)
, ThumbMode(Thumb1)
@@ -112,6 +116,14 @@
if (!isThumb() || hasThumb2())
PostRAScheduler = true;
+
+ // Set CPU specific features.
+ if (CPUString == "cortex-a8") {
+ // On Cortex-a8, it's faster to perform some single-precision FP
+ // operations with NEON instructions.
+ if (UseNEONFP.getPosition() == 0)
+ UseNEONForSinglePrecisionFP = true;
+ }
}
/// GVIsIndirectSymbol - true if the GV will be accessed via an indirect symbol.