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Define the subtarget feature for the architecture version,
as derived from the target triple. This is important for enabling features that are implied based on the architecture version. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@118643 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -64,13 +64,13 @@ ARMSubtarget::ARMSubtarget(const std::string &TT, const std::string &FS,
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// Determine default and user specified characteristics
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// Parse features string.
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CPUString = ParseSubtargetFeatures(FS, CPUString);
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// When no arch is specified either by CPU or by attributes, make the default
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// ARMv4T.
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if (CPUString == "generic" && (FS.empty() || FS == "generic"))
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const char *ARMArchFeature = "";
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if (CPUString == "generic" && (FS.empty() || FS == "generic")) {
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ARMArchVersion = V4T;
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ARMArchFeature = ",+v4t";
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}
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// Set the boolean corresponding to the current target triple, or the default
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// if one cannot be determined, to true.
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@ -88,30 +88,36 @@ ARMSubtarget::ARMSubtarget(const std::string &TT, const std::string &FS,
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unsigned SubVer = TT[Idx];
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if (SubVer >= '7' && SubVer <= '9') {
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ARMArchVersion = V7A;
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if (Len >= Idx+2 && TT[Idx+1] == 'm')
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ARMArchFeature = ",+v7a";
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if (Len >= Idx+2 && TT[Idx+1] == 'm') {
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ARMArchVersion = V7M;
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ARMArchFeature = ",+v7m";
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}
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} else if (SubVer == '6') {
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ARMArchVersion = V6;
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if (Len >= Idx+3 && TT[Idx+1] == 't' && TT[Idx+2] == '2')
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ARMArchFeature = ",+v6";
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if (Len >= Idx+3 && TT[Idx+1] == 't' && TT[Idx+2] == '2') {
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ARMArchVersion = V6T2;
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ARMArchFeature = ",+v6t2";
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}
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} else if (SubVer == '5') {
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ARMArchVersion = V5T;
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if (Len >= Idx+3 && TT[Idx+1] == 't' && TT[Idx+2] == 'e')
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ARMArchFeature = ",+v5t";
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if (Len >= Idx+3 && TT[Idx+1] == 't' && TT[Idx+2] == 'e') {
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ARMArchVersion = V5TE;
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ARMArchFeature = ",+v5te";
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}
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} else if (SubVer == '4') {
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if (Len >= Idx+2 && TT[Idx+1] == 't')
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if (Len >= Idx+2 && TT[Idx+1] == 't') {
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ARMArchVersion = V4T;
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else
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ARMArchFeature = ",+v4t";
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} else {
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ARMArchVersion = V4;
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ARMArchFeature = "";
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}
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}
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}
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// Thumb2 implies at least V6T2.
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if (ARMArchVersion >= V6T2)
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ThumbMode = Thumb2;
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else if (ThumbMode >= Thumb2)
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ARMArchVersion = V6T2;
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if (Len >= 10) {
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if (TT.find("-darwin") != std::string::npos)
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// arm-darwin
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@ -121,6 +127,25 @@ ARMSubtarget::ARMSubtarget(const std::string &TT, const std::string &FS,
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if (TT.find("eabi") != std::string::npos)
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TargetABI = ARM_ABI_AAPCS;
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// Parse features string. If the first entry in FS (the CPU) is missing,
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// insert the architecture feature derived from the target triple. This is
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// important for setting features that are implied based on the architecture
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// version.
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std::string FSWithArch;
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if (FS.empty())
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FSWithArch = std::string(ARMArchFeature);
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else if (FS.find(',') == 0)
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FSWithArch = std::string(ARMArchFeature) + FS;
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else
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FSWithArch = FS;
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CPUString = ParseSubtargetFeatures(FSWithArch, CPUString);
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// Thumb2 implies at least V6T2.
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if (ARMArchVersion >= V6T2)
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ThumbMode = Thumb2;
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else if (ThumbMode >= Thumb2)
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ARMArchVersion = V6T2;
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if (isAAPCS_ABI())
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stackAlignment = 8;
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