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2016 Jul 21
2
InlineAsm and allocation to wrong register for indirect access
Hi, I am seeing a case, in a private port, of an inline asm with indirect memory references being allocated invalid registers (i.e. registers that cannot be used on loads). For example, the inline asm constraint is correct: call void asm sideeffect "MOV $$r0, $0\0AMOV $$r0, $1\0A", "*m,*m,~{r0}"(i16* @a, i16* %b) #1, !srcloc !1 but then $0 and $1 are allocated to registers that cannot be used as a memory base pointer. I am having trouble finding where this decision is made. Is InlineAsm going through the normal register allocation process or do...