https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106096
--- Comment #6 from Xi Ruoyao <xry111 at mengyan1223 dot wang> ---
(In reply to chenglulu from comment #5)
> Created attachment 53213 [details]
> Modify the allocation order of caller saved registers.
I think we need to completely prevent LARCH_PROLOGUE_TEMP from being used for
sibcall:
diff --git a/gcc/config/loongarch/loongarch.h
b/gcc/config/loongarch/loongarch.h
index 4d107a42209..f9de9a6e4fb 100644
--- a/gcc/config/loongarch/loongarch.h
+++ b/gcc/config/loongarch/loongarch.h
@@ -511,7 +511,7 @@ enum reg_class
#define REG_CLASS_CONTENTS \
{ \
{ 0x00000000, 0x00000000, 0x00000000 }, /* NO_REGS */ \
- { 0x001ff000, 0x00000000, 0x00000000 }, /* SIBCALL_REGS */ \
+ { 0x001fd000, 0x00000000, 0x00000000 }, /* SIBCALL_REGS */ \
{ 0xff9ffff0, 0x00000000, 0x00000000 }, /* JIRL_REGS */ \
{ 0xfffffffc, 0x00000000, 0x00000000 }, /* CSR_REGS */ \
{ 0xffffffff, 0x00000000, 0x00000000 }, /* GR_REGS */ \
Or even if LARCH_PROLOGUE_TEMP is less preferred, the register allocator may
still use it for sibcall and blow something up again.
(Above is for $r13, if you want to use $r12 instead as LARCH_PROLOGUE_TEMP you
need to adjust it.)
