From 47d4c4739bafcb9864dc8d1c2b44903ad4f75b68 Mon Sep 17 00:00:00 2001 From: Jens Arnold Date: Sat, 11 Jul 2009 23:43:44 +0000 Subject: ARM asm LCD and ATA driver functions: Don't save r12 as it is a scratch reg. Saves a bit of stack and execution time. git-svn-id: svn://svn.rockbox.org/rockbox/trunk@21795 a1c6a512-1295-4272-9138-f99709370657 --- firmware/target/arm/as3525/sansa-clip/lcd-as-clip.S | 16 ++++++++-------- 1 file changed, 8 insertions(+), 8 deletions(-) (limited to 'firmware/target/arm/as3525/sansa-clip/lcd-as-clip.S') diff --git a/firmware/target/arm/as3525/sansa-clip/lcd-as-clip.S b/firmware/target/arm/as3525/sansa-clip/lcd-as-clip.S index ed430178b9..5a52eb032c 100644 --- a/firmware/target/arm/as3525/sansa-clip/lcd-as-clip.S +++ b/firmware/target/arm/as3525/sansa-clip/lcd-as-clip.S @@ -39,15 +39,15 @@ * r3/r4 - current block of phases * r5/r6 - current block of values * r7 - lcd data accumulator - * r8 - phase signs mask + * r12 - phase signs mask * lr - lcd bridge address */ lcd_grey_data: - stmfd sp!, {r4-r8, lr} - mov r8, #0x80 - orr r8, r8, r8, lsl #8 - orr r8, r8, r8, lsl #16 + stmfd sp!, {r4-r7, lr} + mov r12, #0x80 + orr r12, r12, r12, lsl #8 + orr r12, r12, r12, lsl #16 ldr lr, =GPIOA_BASE mov r3, #(1<<5) @@ -70,7 +70,7 @@ lcd_grey_data: orrne r7, r7, #0x2000 tst r3, #0x80000000 orrne r7, r7, #0x1000 - bic r3, r3, r8 + bic r3, r3, r12 add r3, r3, r5 /* set bits 3..0 */ @@ -82,7 +82,7 @@ lcd_grey_data: orrne r7, r7, #0x02 tst r4, #0x80000000 orrne r7, r7, #0x01 - bic r4, r4, r8 + bic r4, r4, r12 add r4, r4, r6 stmia r1!, {r3-r4} @@ -102,5 +102,5 @@ lcd_grey_data: ands r5, r5, #(1<<10) @ wait until push fifo empties beq 1b - ldmfd sp!, {r4-r8, pc} + ldmfd sp!, {r4-r7, pc} .size lcd_grey_data,.-lcd_grey_data -- cgit v1.2.3