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Simplify RV64 function epilogue

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Previous sp can be computed based from only frame pointer and short
offset. ra and s0 can be restored from stack with constant fp offset.
This commit is contained in:
Aleksi Hannula 2025-11-21 09:32:14 +02:00
parent 3327327e5d
commit e7be7b192d
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1 changed files with 6 additions and 10 deletions
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16
riscv64-gen.c
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@ -911,18 +911,14 @@ ST_FUNC void gfunc_epilog(void)
loc = (loc - num_va_regs * 8);
d = v = (-loc + 15) & -16;
if (v >= (1 << 11)) {
d = 16;
o(0x37 | (5 << 7) | UPPER(v-16)); //lui t0, upper(v)
EI(0x13, 0, 5, 5, SIGN11(v-16)); // addi t0, t0, lo(v)
ER(0x33, 0, 2, 2, 5, 0); // add sp, sp, t0
}
EI(0x03, 3, 1, 2, d - 8 - num_va_regs * 8); // ld ra, v-8(sp)
EI(0x03, 3, 8, 2, d - 16 - num_va_regs * 8); // ld s0, v-16(sp)
EI(0x13, 0, 2, 2, d); // addi sp, sp, v
EI(0x67, 0, 0, 1, 0); // jalr x0, 0(x1), aka ret
EI(0x13, 0, 2, 8, num_va_regs * 8); // addi sp, s0, num_va_regs*8
EI(0x03, 3, 1, 8, -8); // ld ra, -8(s0)
EI(0x03, 3, 8, 8, -16); // ld s0, -16(s0)
EI(0x67, 0, 0, 1, 0); // jalr x0, 0(x1), aka ret
large_ofs_ind = ind;
if (v >= (1 << 11)) {
d = 16;
EI(0x13, 0, 8, 2, d - num_va_regs * 8); // addi s0, sp, d
o(0x37 | (5 << 7) | UPPER(v-16)); //lui t0, upper(v)
EI(0x13, 0, 5, 5, SIGN11(v-16)); // addi t0, t0, lo(v)