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Fix udiv100000 and udiv1000000000 ASM macros changing the source

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This commit is contained in:
Myles Busig 2024-04-04 04:18:36 -06:00
parent 55b1658e45
commit 1d41674dc1
3 changed files with 12 additions and 11 deletions
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15
include/mtl/armv4t/asm/math.s → include/armv4t/mtl/asm/math.s
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@ -41,12 +41,13 @@
* k = 17 * k = 17
* *
* This division uses the output produces by clang for a division by 100000. * This division uses the output produces by clang for a division by 100000.
* I don't understand why it works, but it does. * I don't understand why it works, but it does. It also needs one extra
* temporary register to preserve the value of rx.
*/ */
.macro udiv100000 rd, rx, rt .macro udiv100000 rd, rx, rt, rtt
lsr \rx, $5 lsr \rtt, \rx, $5
ldr \rt, =0xA7C5AC5 ldr \rt, =0xA7C5AC5
umull \rt, \rd, \rx, \rt umull \rt, \rd, \rtt, \rt
lsrs \rd, $7 lsrs \rd, $7
.endm .endm
@ -71,10 +72,10 @@
/* /*
* Same situation as udiv100000 * Same situation as udiv100000
*/ */
.macro udiv1000000000 rd, rx, rt .macro udiv1000000000 rd, rx, rt, rtt
lsr \rx, $9 lsr \rtt, \rx, $9
ldr \rt, =0x44B83 ldr \rt, =0x44B83
umull \rt, \rd, \rx, \rt umull \rt, \rd, \rtt, \rt
lsrs \rd, $7 lsrs \rd, $7
.endm .endm

2
src/armv4t/math.s
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@ -1,6 +1,6 @@
.syntax unified .syntax unified
.include "mtl/armv4t/asm/math.s" .include "mtl/asm/math.s"
.section .iwram, "ax", %progbits .section .iwram, "ax", %progbits
.arm .arm

6
src/armv4t/to.s
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@ -1,6 +1,6 @@
.syntax unified .syntax unified
.include "mtl/armv4t/asm/math.s" .include "mtl/asm/math.s"
.section .iwram, "ax", %progbits .section .iwram, "ax", %progbits
.arm .arm
@ -133,7 +133,7 @@ push {r4-r6}
add r3, $1 add r3, $1
.Ldigits_10: .Ldigits_10:
// Divide by 10^9 to get the most significant digit // Divide by 10^9 to get the most significant digit
udiv1000000000 r5, r0, r12 udiv1000000000 r5, r0, r12, r6
// Write the digit to the string // Write the digit to the string
add r6, r5, '0' add r6, r5, '0'
strb r6, [r1], $1 strb r6, [r1], $1
@ -164,7 +164,7 @@ push {r4-r6}
mul r6, r5 mul r6, r5
sub r0, r6 sub r0, r6
.Ldigits_6: .Ldigits_6:
udiv100000 r5, r0, r12 udiv100000 r5, r0, r12, r6
add r6, r5, '0' add r6, r5, '0'
strb r6, [r1], $1 strb r6, [r1], $1
ldr r6, =100000 ldr r6, =100000