[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
This commit is contained in:
Hal Finkel 2015-01-13 17:47:59 +00:00
parent a82e676bac
commit 5e508855d6
2 changed files with 7 additions and 0 deletions

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@ -456,6 +456,11 @@ public:
/// used by register scavenger to determine what registers are free.
virtual BitVector getReservedRegs(const MachineFunction &MF) const = 0;
/// Prior to adding the live-out mask to a stackmap or patchpoint
/// instruction, provide the target the opportunity to adjust it (mainly to
/// remove pseudo-registers that should be ignored).
virtual void adjustStackMapLiveOutMask(uint32_t *Mask) const { }
/// getMatchingSuperReg - Return a super-register of the specified register
/// Reg so its sub-register of index SubIdx is Reg.
unsigned getMatchingSuperReg(unsigned Reg, unsigned SubIdx,

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@ -123,5 +123,7 @@ uint32_t *StackMapLiveness::createRegisterMask() const {
for (LivePhysRegs::const_iterator RI = LiveRegs.begin(), RE = LiveRegs.end();
RI != RE; ++RI)
Mask[*RI / 32] |= 1U << (*RI % 32);
TRI->adjustStackMapLiveOutMask(Mask);
return Mask;
}