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LoongArch: vDSO: Make use of the t8 register for vgetrandom-chacha 

Make use of the t8 register for vgetrandom-chacha, so we don't need to
reuse a register and rematerialize a constant.  I

Signed-off-by: Xi Ruoyao <xry111@xry111.site>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
pull/1193/head
Xi Ruoyao 2025-03-30 16:31:12 +08:00 committed by Huacai Chen
parent c271c86a4c
commit a34ea549aa
1 changed files with 3 additions and 10 deletions
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13
arch/loongarch/vdso/vgetrandom-chacha.S
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@ -58,9 +58,7 @@ SYM_FUNC_START(__arch_chacha20_blocks_nostack)
#define copy0 t5
#define copy1 t6
#define copy2 t7
/* Reuse i as copy3 */
#define copy3 i
#define copy3 t8
/* Packs to be used with OP_4REG */
#define line0 state0, state1, state2, state3
@ -99,6 +97,7 @@ SYM_FUNC_START(__arch_chacha20_blocks_nostack)
li.w copy0, 0x61707865
li.w copy1, 0x3320646e
li.w copy2, 0x79622d32
li.w copy3, 0x6b206574
ld.w cnt_lo, counter, 0
ld.w cnt_hi, counter, 4
@ -108,7 +107,7 @@ SYM_FUNC_START(__arch_chacha20_blocks_nostack)
move state0, copy0
move state1, copy1
move state2, copy2
li.w state3, 0x6b206574
move state3, copy3
/* state[4,5,..,11] = key */
ld.w state4, key, 0
@ -167,12 +166,6 @@ SYM_FUNC_START(__arch_chacha20_blocks_nostack)
addi.w i, i, -1
bnez i, .Lpermute
/*
* copy[3] = "expa", materialize it here because copy[3] shares the
* same register with i which just became dead.
*/
li.w copy3, 0x6b206574
/* output[0,1,2,3] = copy[0,1,2,3] + state[0,1,2,3] */
OP_4REG add.w line0, copy
st.w state0, output, 0