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unix: Add asm statements needed to read registers with clang. Code generated by gcc 4.9.0 is unchanged (same statements, different order).

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Both are inefficient, saving unmodified registers on the stack.
This commit is contained in:
Antonin ENFRUN 2014-05-12 00:24:41 +02:00
parent 1b901c320b
commit ceac71f1f5
1 changed files with 6 additions and 0 deletions
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6
unix/gccollect.c
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@ -43,11 +43,17 @@ typedef machine_uint_t regs_t[6];
void gc_helper_get_regs(regs_t arr) {
register long rbx asm ("rbx");
asm("" : "=r"(rbx));
register long rbp asm ("rbp");
asm("" : "=r"(rbp));
register long r12 asm ("r12");
asm("" : "=r"(r12));
register long r13 asm ("r13");
asm("" : "=r"(r13));
register long r14 asm ("r14");
asm("" : "=r"(r14));
register long r15 asm ("r15");
asm("" : "=r"(r15));
arr[0] = rbx;
arr[1] = rbp;
arr[2] = r12;