No crash with -regalloc=simple, but wrong is generated.

Wrong code, I mean. :)

Is this still broken with tot?

In r96110:

$ llc -regalloc=linearscan bug-O1.bc
llc: /tmp/llvm/lib/CodeGen/RegAllocLinearScan.cpp:1183: void::RALinScan::assignRegOrStackSlotAtInterval(llvm::LiveInterval*): Assertion `false && "Ran out of registers during register allocation!"' failed.
0 llc 0x08764913
Stack dump:
0. Program arguments: llc -regalloc=linearscan bug-O1.bc

1. Running pass 'Linear Scan Register Allocator' on function '@g'
   Aborted

$ llc -regalloc=local bug-O1.bc
LLVM ERROR: Ran out of registers during register allocation!
Please check your inline asm statement for invalid constraints:
INLINEASM <es:push $0
call ${1:a}
pop %edx>, 11, %EBP, 11, %EBP, 14, %AX<earlyclobber,def,dead>, 14, %BX<earlyclobber,def,dead>, 14, %CX<earlyclobber,def,dead>, 14, %DX<earlyclobber,def,dead>, 14, %SI<earlyclobber,def,dead>, 14, %DI<earlyclobber,def,dead>, 14, %EFLAGS<earlyclobber,def,dead>

$ llc -regalloc=pbqp bug-O1.bc
llc: /tmp/llvm/lib/CodeGen/LiveIntervalAnalysis.cpp:1668: std::vector<llvm::LiveInterval*, std::allocatorllvm::LiveInterval* > llvm::LiveIntervals::addIntervalsForSpills(const llvm::LiveInterval&, llvm::SmallVectorImplllvm::LiveInterval*&, const llvm::MachineLoopInfo*, llvm::VirtRegMap&): Assertion `li.weight != (__builtin_huge_valf()) && "attempt to spill already spilled interval!"' failed.
0 llc 0x08764913
Stack dump:
0. Program arguments: llc -regalloc=pbqp bug-O1.bc

1. Running pass 'PBQP Register Allocator' on function '@g'
   Aborted

I believe this is fixed as of 106893. (Note that &f is not valid with "i" in PIC modes, as the address cannot be computed at linktime.)

&f should actually work with "i" in RIP-relative mode, which is default on Darwin x86-64. Fixed in 107727.