在 2024/1/5 下午4:37, Xi Ruoyao 写道:
On Fri, 2024-01-05 at 11:40 +0800, Lulu Cheng wrote:
bool
loongarch_explicit_relocs_p (enum loongarch_symbol_type type)
{
+ /* Instructions pcalau12i, addi.d, lu32i.d and lu52i.d must be adjancent
+ so that the linker can infer the PC of pcalau12i to apply relocations
+ to lu32i.d and lu52i.d. Otherwise, the results would be incorrect if
+ these four instructions are not in the same 4KiB page.
+ Therefore, macro instructions are used when cmodel=extreme. */
+ if (loongarch_symbol_extreme_p (type))
+ return false;
I think this is a bit of strange. With -mexplicit-relocs={auto,always}
we should still use explicit relocs, but coding all 4 instructions
altogether as
"pcalau12i.d\t%1,%pc64_hi12(%2)\n\taddi.d\t%0,$r0,%pclo12(%2)\n\tlu32i.d\t%0,%pc64_lo20(%2)\n\tlu52i.d\t%0,%0,%pc64_hi12(%2)"
Give me several hours trying to implement this...
I think there is no difference between macros and these instructions put
together. If implement it in a split form, I think I can try it through
TARGET_SCHED_MACRO_FUSION_PAIR_P
