ARMv7M vs. ARMv7E-M support.
The DSP instructions in the Thumb2 instruction set are an optional extension
in the Cortex-M* archtitecture. When present, the implementation is considered
an "ARMv7E-M implementation," and when not, an "ARMv7-M implementation."
Add a subtarget feature hook for the v7e-m instructions and hook it up. The
cortex-m3 cpu is an example of a v7m implementation, while the cortex-m4 is
a v7e-m implementation.
rdar://9572992
llvm-svn: 134261
diff --git a/llvm/lib/Target/ARM/ARM.td b/llvm/lib/Target/ARM/ARM.td
index 6af5f85..39a3528 100644
--- a/llvm/lib/Target/ARM/ARM.td
+++ b/llvm/lib/Target/ARM/ARM.td
@@ -75,6 +75,10 @@
"AvoidCPSRPartialUpdate", "true",
"Avoid CPSR partial update for OOO execution">;
+/// Some M architectures don't have the DSP extension (v7E-M vs. v7M)
+def FeatureDSPThumb2 : SubtargetFeature<"t2dsp", "Thumb2DSP", "true",
+ "Supports v7 DSP instructions in Thumb2.">;
+
// Multiprocessing extension.
def FeatureMP : SubtargetFeature<"mp", "HasMPExtension", "true",
"Supports Multiprocessing extension">;
@@ -93,14 +97,20 @@
[FeatureNoARM, FeatureDB]>;
def ArchV6T2 : SubtargetFeature<"v6t2", "ARMArchVersion", "V6T2",
"ARM v6t2",
- [FeatureThumb2]>;
+ [FeatureThumb2, FeatureDSPThumb2]>;
def ArchV7A : SubtargetFeature<"v7a", "ARMArchVersion", "V7A",
"ARM v7A",
- [FeatureThumb2, FeatureNEON, FeatureDB]>;
+ [FeatureThumb2, FeatureNEON, FeatureDB,
+ FeatureDSPThumb2]>;
def ArchV7M : SubtargetFeature<"v7m", "ARMArchVersion", "V7M",
"ARM v7M",
[FeatureThumb2, FeatureNoARM, FeatureDB,
FeatureHWDiv]>;
+def ArchV7EM : SubtargetFeature<"v7em", "ARMArchVersion", "V7EM",
+ "ARM v7E-M",
+ [FeatureThumb2, FeatureNoARM, FeatureDB,
+ FeatureHWDiv, FeatureDSPThumb2,
+ FeatureT2XtPk]>;
//===----------------------------------------------------------------------===//
// ARM Processors supported.
@@ -192,7 +202,7 @@
// V7M Processors.
def : ProcNoItin<"cortex-m3", [ArchV7M]>;
-def : ProcNoItin<"cortex-m4", [ArchV7M, FeatureVFP2, FeatureVFPOnlySP]>;
+def : ProcNoItin<"cortex-m4", [ArchV7EM, FeatureVFP2, FeatureVFPOnlySP]>;
//===----------------------------------------------------------------------===//
// Register File Description