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LoongArch: Use common function sign_extend64()

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There exists a common function sign_extend64() to sign extend a 64-bit
value using specified bit as sign-bit in include/linux/bitops.h, it is
more efficient, let us use it and remove the arch-specific sign_extend()
under arch/loongarch.

Suggested-by: Jinyang He <hejinyang@loongson.cn>
Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
This commit is contained in:
Tiezhu Yang 2023-01-17 11:42:16 +08:00 committed by Huacai Chen
parent d52fec86a4
commit 2959fce7fd
2 changed files with 3 additions and 11 deletions
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8
arch/loongarch/include/asm/inst.h
View File

@ -377,14 +377,6 @@ static inline bool unsigned_imm_check(unsigned long val, unsigned int bit)
return val < (1UL << bit);
}
static inline unsigned long sign_extend(unsigned long val, unsigned int idx)
{
if (!is_imm_negative(val, idx + 1))
return ((1UL << idx) - 1) & val;
else
return ~((1UL << idx) - 1) | val;
}
#define DEF_EMIT_REG0I26_FORMAT(NAME, OP) \
static inline void emit_##NAME(union loongarch_instruction *insn, \
int offset) \

6
arch/loongarch/kernel/alternative.c
View File

@ -74,7 +74,7 @@ static void __init_or_module recompute_jump(union loongarch_instruction *buf,
switch (src->reg0i26_format.opcode) {
case b_op:
case bl_op:
jump_addr = cur_pc + sign_extend((si_h << 16 | si_l) << 2, 27);
jump_addr = cur_pc + sign_extend64((si_h << 16 | si_l) << 2, 27);
if (in_alt_jump(jump_addr, start, end))
return;
offset = jump_addr - pc;
@ -93,7 +93,7 @@ static void __init_or_module recompute_jump(union loongarch_instruction *buf,
fallthrough;
case beqz_op:
case bnez_op:
jump_addr = cur_pc + sign_extend((si_h << 16 | si_l) << 2, 22);
jump_addr = cur_pc + sign_extend64((si_h << 16 | si_l) << 2, 22);
if (in_alt_jump(jump_addr, start, end))
return;
offset = jump_addr - pc;
@ -112,7 +112,7 @@ static void __init_or_module recompute_jump(union loongarch_instruction *buf,
case bge_op:
case bltu_op:
case bgeu_op:
jump_addr = cur_pc + sign_extend(si << 2, 17);
jump_addr = cur_pc + sign_extend64(si << 2, 17);
if (in_alt_jump(jump_addr, start, end))
return;
offset = jump_addr - pc;