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ARMv7M vs. ARMv7E-M support.

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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



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@134261 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jim Grosbach
2011-07-01 21:12:19 +00:00
parent 5b1b4489cf
commit a7603982db
9 changed files with 121 additions and 53 deletions
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9
lib/Target/ARM/ARMSubtarget.h
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@@ -28,7 +28,7 @@ class GlobalValue;
class ARMSubtarget : public ARMGenSubtargetInfo {
protected:
enum ARMArchEnum {
V4, V4T, V5T, V5TE, V6, V6M, V6T2, V7A, V7M
V4, V4T, V5T, V5TE, V6, V6M, V6T2, V7A, V7M, V7EM
};
enum ARMProcFamilyEnum {
@@ -45,7 +45,7 @@ protected:
};
/// ARMArchVersion - ARM architecture version: V4, V4T (base), V5T, V5TE,
/// V6, V6T2, V7A, V7M.
/// V6, V6T2, V7A, V7M, V7EM.
ARMArchEnum ARMArchVersion;
/// ARMProcFamily - ARM processor family: Cortex-A8, Cortex-A9, and others.
@@ -130,6 +130,10 @@ protected:
/// ARMTargetLowering::allowsUnalignedMemoryAccesses().
bool AllowsUnalignedMem;
/// Thumb2DSP - If true, the subtarget supports the v7 DSP (saturating arith
/// and such) instructions in Thumb2 code.
bool Thumb2DSP;
/// 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;
@@ -199,6 +203,7 @@ protected:
bool prefers32BitThumb() const { return Pref32BitThumb; }
bool avoidCPSRPartialUpdate() const { return AvoidCPSRPartialUpdate; }
bool hasMPExtension() const { return HasMPExtension; }
bool hasThumb2DSP() const { return Thumb2DSP; }
bool hasFP16() const { return HasFP16; }
bool hasD16() const { return HasD16; }