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Initial bits of ARMv4-only support.

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Patch by John Tytgat!

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@97886 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Anton Korobeynikov
2010-03-06 19:39:36 +00:00
parent 043f3c2a0e
commit ce7bf1c55f
6 changed files with 101 additions and 29 deletions
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40
lib/Target/ARM/ARMSubtarget.cpp
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@@ -33,7 +33,7 @@ UseMOVT("arm-use-movt",
ARMSubtarget::ARMSubtarget(const std::string &TT, const std::string &FS,
bool isT)
: ARMArchVersion(V4T)
: ARMArchVersion(V4)
, ARMFPUType(None)
, UseNEONForSinglePrecisionFP(UseNEONFP)
, IsThumb(isT)
@@ -54,6 +54,11 @@ ARMSubtarget::ARMSubtarget(const std::string &TT, const std::string &FS,
// Parse features string.
CPUString = ParseSubtargetFeatures(FS, CPUString);
// When no arch is specified either by CPU or by attributes, make the default
// ARMv4T.
if (CPUString == "generic" && (FS.empty() || FS == "generic"))
ARMArchVersion = V4T;
// Set the boolean corresponding to the current target triple, or the default
// if one cannot be determined, to true.
unsigned Len = TT.length();
@@ -68,25 +73,28 @@ ARMSubtarget::ARMSubtarget(const std::string &TT, const std::string &FS,
}
if (Idx) {
unsigned SubVer = TT[Idx];
if (SubVer > '4' && SubVer <= '9') {
if (SubVer >= '7') {
ARMArchVersion = V7A;
} else if (SubVer == '6') {
ARMArchVersion = V6;
if (Len >= Idx+3 && TT[Idx+1] == 't' && TT[Idx+2] == '2')
ARMArchVersion = V6T2;
} else if (SubVer == '5') {
ARMArchVersion = V5T;
if (Len >= Idx+3 && TT[Idx+1] == 't' && TT[Idx+2] == 'e')
ARMArchVersion = V5TE;
}
if (ARMArchVersion >= V6T2)
ThumbMode = Thumb2;
if (SubVer >= '7' && SubVer <= '9') {
ARMArchVersion = V7A;
} else if (SubVer == '6') {
ARMArchVersion = V6;
if (Len >= Idx+3 && TT[Idx+1] == 't' && TT[Idx+2] == '2')
ARMArchVersion = V6T2;
} else if (SubVer == '5') {
ARMArchVersion = V5T;
if (Len >= Idx+3 && TT[Idx+1] == 't' && TT[Idx+2] == 'e')
ARMArchVersion = V5TE;
} else if (SubVer == '4') {
if (Len >= Idx+2 && TT[Idx+1] == 't')
ARMArchVersion = V4T;
else
ARMArchVersion = V4;
}
}
// Thumb2 implies at least V6T2.
if (ARMArchVersion < V6T2 && ThumbMode >= Thumb2)
if (ARMArchVersion >= V6T2)
ThumbMode = Thumb2;
else if (ThumbMode >= Thumb2)
ARMArchVersion = V6T2;
if (Len >= 10) {