Add substarget feature for FP16
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@98503 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/ARM/ARM.td b/lib/Target/ARM/ARM.td
index 7033861..bbb1dbd 100644
--- a/lib/Target/ARM/ARM.td
+++ b/lib/Target/ARM/ARM.td
@@ -40,6 +40,8 @@
"Enable NEON instructions">;
def FeatureThumb2 : SubtargetFeature<"thumb2", "ThumbMode", "Thumb2",
"Enable Thumb2 instructions">;
+def FeatureFP16 : SubtargetFeature<"fp16", "HasFP16", "true",
+ "Enable half-precision floating point">;
//===----------------------------------------------------------------------===//
// ARM Processors supported.
diff --git a/lib/Target/ARM/ARMISelLowering.cpp b/lib/Target/ARM/ARMISelLowering.cpp
index d37a36e..ac21068 100644
--- a/lib/Target/ARM/ARMISelLowering.cpp
+++ b/lib/Target/ARM/ARMISelLowering.cpp
@@ -436,7 +436,7 @@
setOperationAction(ISD::FP_TO_SINT, MVT::i32, Custom);
}
// Special handling for half-precision FP.
- if (Subtarget->hasVFP3()) {
+ if (Subtarget->hasVFP3() && Subtarget->hasFP16()) {
setOperationAction(ISD::FP16_TO_FP32, MVT::f32, Custom);
setOperationAction(ISD::FP32_TO_FP16, MVT::i32, Custom);
}
diff --git a/lib/Target/ARM/ARMSubtarget.cpp b/lib/Target/ARM/ARMSubtarget.cpp
index 622034b..2dad7f1 100644
--- a/lib/Target/ARM/ARMSubtarget.cpp
+++ b/lib/Target/ARM/ARMSubtarget.cpp
@@ -41,6 +41,7 @@
, PostRAScheduler(false)
, IsR9Reserved(ReserveR9)
, UseMovt(UseMOVT)
+ , HasFP16(false)
, stackAlignment(4)
, CPUString("generic")
, TargetType(isELF) // Default to ELF unless otherwise specified.
diff --git a/lib/Target/ARM/ARMSubtarget.h b/lib/Target/ARM/ARMSubtarget.h
index 4d36036..2dc81a4 100644
--- a/lib/Target/ARM/ARMSubtarget.h
+++ b/lib/Target/ARM/ARMSubtarget.h
@@ -66,6 +66,10 @@
/// imms (including global addresses).
bool UseMovt;
+ /// HasFP16 - True if subtarget supports half-precision FP (We support VFP+HF
+ /// only so far)
+ bool HasFP16;
+
/// stackAlignment - The minimum alignment known to hold of the stack frame on
/// entry to the function and which must be maintained by every function.
unsigned stackAlignment;
@@ -116,6 +120,8 @@
bool useNEONForSinglePrecisionFP() const {
return hasNEON() && UseNEONForSinglePrecisionFP; }
+ bool hasFP16() const { return HasFP16; }
+
bool isTargetDarwin() const { return TargetType == isDarwin; }
bool isTargetELF() const { return TargetType == isELF; }