Displaying 2 results from an estimated 2 matches for "t2stmdb_upd".
2019 Apr 14
3
[A bug?] Failed to use BuildMI to add R7 - R12 registers for tADDi8 and tPUSH of ARM
Hi all,
I’m trying to insert some add/sub and push/pop instructions in a MachineFunction pass for ARMv7-M. However, I encountered something weird.
For an add, when I use
BuildMI(….., TII->get(ARM::tADDi8), reg).addReg(reg).addReg(reg).addImm(imm).
if reg is R0 - R7, everything is fine: I would get something like
adds r1, 4
But if I use R8 - R12 as the reg in the BuildMI, I wouldn’t get
2015 Aug 10
2
ARM: Predicated returns considered analyzable?
...If Converter ***:
# Machine code for function foo: Post SSA
Frame Objects:
fi#0: size=4, align=4, at location [SP-4]
fi#1: size=4, align=4, at location [SP-8]
Function Live Ins: %R0, %R1
BB#0: derived from LLVM BB %entry
Live Ins: %R0 %R1 %R7 %LR %LR %R7
%SP<def,tied1> = t2STMDB_UPD %SP<tied0>, pred:14, pred:%noreg,
%R7<kill>, %LR<kill>; flags: FrameSetup
CFI_INSTRUCTION <call frame instruction>; flags: FrameSetup
CFI_INSTRUCTION <call frame instruction>; flags: FrameSetup
CFI_INSTRUCTION <call frame instruction>;...