Commit a34ea549 authored by Xi Ruoyao's avatar Xi Ruoyao Committed by Huacai Chen
Browse files

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: default avatarXi Ruoyao <xry111@xry111.site>
Signed-off-by: default avatarHuacai Chen <chenhuacai@loongson.cn>
parent c271c86a

arch/loongarch/vdso/vgetrandom-chacha.S

+3 −10
Original line number Diff line number Diff line
@@ -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