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[inline-asm] clang doesn't accept the operand %1 #97673

Open vfdff opened 2 weeks ago

vfdff commented 2 weeks ago

test: https://gcc.godbolt.org/z/e1c1qMTTM

void _mcount(uint64_t caller_ra){
uint64_t rbp=0;
uint64_t rsp=0;
__asm__ __volatile__("mov x0, fp\n"
                     "mov %1, sp \n"
                     :"=g"(rbp),"=g"(rsp)       
                     :); 

printf("rbp = 0x%llx , rsp=0x%llx\n" , rbp , rsp);
}

I except the register value sp will be saved in local variable rsp. But it is only accept by gcc

gcc -c -o testhello.o testhello.c -pg -g

error reported by clang:

<source>:9:27: error: invalid operand for instruction
9 |                          "mov %1, sp \n"

svs-quic commented 2 weeks ago

This looks like a duplicate of #20571.

92040 is an effort to fix this.