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[StackMaps] Allow the target to pre-process the live-out mask
Some targets, PowerPC for example, have pseudo-registers (such as that used to represent the rounding mode), that don't have DWARF register numbers or a register class. These are used only for internal dependency tracking, and should not appear in the recorded live-outs. This adds a callback allowing the target to pre-process the live-out mask in order to remove these kinds of registers so that the StackMaps code does not complain about them and/or attempt to include them in the output. This will be used by the PowerPC target in a future commit. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225805 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -456,6 +456,11 @@ public:
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/// used by register scavenger to determine what registers are free.
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virtual BitVector getReservedRegs(const MachineFunction &MF) const = 0;
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/// Prior to adding the live-out mask to a stackmap or patchpoint
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/// instruction, provide the target the opportunity to adjust it (mainly to
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/// remove pseudo-registers that should be ignored).
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virtual void adjustStackMapLiveOutMask(uint32_t *Mask) const { }
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/// getMatchingSuperReg - Return a super-register of the specified register
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/// Reg so its sub-register of index SubIdx is Reg.
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unsigned getMatchingSuperReg(unsigned Reg, unsigned SubIdx,
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@ -123,5 +123,7 @@ uint32_t *StackMapLiveness::createRegisterMask() const {
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for (LivePhysRegs::const_iterator RI = LiveRegs.begin(), RE = LiveRegs.end();
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RI != RE; ++RI)
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Mask[*RI / 32] |= 1U << (*RI % 32);
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TRI->adjustStackMapLiveOutMask(Mask);
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return Mask;
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}
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