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Handwritten asm: gu and mgu (#1816)

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* Handwritten asm: gu and mgu

* Remove some unnecessary pad_texts

* Consistent add/and instructions
This commit is contained in:
Tharo
2025-08-16 14:01:46 +01:00
committed by GitHub
parent b1a50c2d1b
commit 086fc5635e
9 changed files with 306 additions and 14 deletions
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src/libultra/gu/sqrtf.s
+9
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#include "PR/asm.h"
#include "PR/regdef.h"
.text
LEAF(sqrtf)
sqrt.s fv0, fa0
j ra
END(sqrtf)
src/libultra/mgu/mtxf2l.s
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#include "PR/asm.h"
#include "PR/regdef.h"
.text
.align 5
#define MTX_INTPART 0
#define MTX_FRACPART 0x20
LEAF(guMtxF2L)
li.s fv0, 65536.0
li t9, 0xFFFF0000
addu t8, a1, MTX_FRACPART
1:
lwc1 ft0, 0(a0)
mul.s ft1, ft0, fv0
trunc.w.s ft2, ft1
lwc1 ft3, 4(a0)
mul.s ft4, ft3, fv0
trunc.w.s ft5, ft4
mfc1 t0, ft2
mfc1 t1, ft5
and t2, t0, t9
srl t3, t1, 0x10
or t4, t2, t3
sw t4, (MTX_INTPART)(a1)
sll t5, t0, 0x10
and t6, t1, 0xFFFF
or t7, t5, t6
sw t7, (MTX_FRACPART)(a1)
addu a1, a1, 4
addu a0, a0, 8
bne a1, t8, 1b
jr ra
END(guMtxF2L)
src/libultra/mgu/mtxident.s
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#include "PR/asm.h"
#include "PR/regdef.h"
.text
.align 5
LEAF(guMtxIdent)
add t0, zero, 1
sll t1, t0, 0x10
sw t1, 0x00(a0)
sw zero, 0x04(a0)
sw t0, 0x08(a0)
sw zero, 0x0C(a0)
sw zero, 0x10(a0)
sw t1, 0x14(a0)
sw zero, 0x18(a0)
sw t0, 0x1C(a0)
sw zero, 0x20(a0)
sw zero, 0x24(a0)
sw zero, 0x28(a0)
sw zero, 0x2c(a0)
sw zero, 0x30(a0)
sw zero, 0x34(a0)
sw zero, 0x38(a0)
sw zero, 0x3C(a0)
jr ra
END(guMtxIdent)
src/libultra/mgu/mtxidentf.s
+26
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#include "PR/asm.h"
#include "PR/regdef.h"
.text
.align 5
LEAF(guMtxIdentF)
li.s t0, 1.0
sw t0, 0x00(a0)
sw zero, 0x04(a0)
sw zero, 0x08(a0)
sw zero, 0x0C(a0)
sw zero, 0x10(a0)
sw t0, 0x14(a0)
sw zero, 0x18(a0)
sw zero, 0x1C(a0)
sw zero, 0x20(a0)
sw zero, 0x24(a0)
sw t0, 0x28(a0)
sw zero, 0x2C(a0)
sw zero, 0x30(a0)
sw zero, 0x34(a0)
sw zero, 0x38(a0)
sw t0, 0x3C(a0)
jr ra
END(guMtxIdentF)
src/libultra/mgu/mtxl2f.s
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#include "PR/asm.h"
#include "PR/regdef.h"
.text
.align 5
#define MTX_INTPART 0
#define MTX_FRACPART 0x20
#define FIXTOF 0.0000152587890625 /* 1.0f / 65536.0f */
LEAF(guMtxL2F)
li.s fv0, FIXTOF
li t9, 0xFFFF0000
addu t8, a1, MTX_FRACPART
1:
lw t0, MTX_INTPART(a1)
lw t1, MTX_FRACPART(a1)
and t2, t0, t9
srl t3, t1, 0x10
or t4, t2, t3
sll t5, t0, 0x10
and t6, t1, 0xFFFF
or t7, t5, t6
mtc1 t4, ft0
cvt.s.w ft1, ft0
mul.s ft2, ft1, fv0
mtc1 t7, ft3
cvt.s.w ft4, ft3
mul.s ft5, ft4, fv0
swc1 ft2, 0(a0)
swc1 ft5, 4(a0)
addu a0, a0, 8
addu a1, a1, 4
bne a1, t8, 1b
jr ra
END(guMtxL2F)
src/libultra/mgu/normalize.s
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#include "PR/asm.h"
#include "PR/regdef.h"
.text
.align 5
LEAF(guNormalize)
lwc1 ft0, (a0)
lwc1 ft1, (a1)
lwc1 ft2, (a2)
.set noreorder
mul.s ft3, ft0, ft0
li.s t0, 1.0
mul.s ft4, ft1, ft1
add.s ft5, ft3, ft4
mul.s ft4, ft2, ft2
.set reorder
add.s ft3, ft4, ft5
mtc1 t0, ft5
sqrt.s ft4, ft3
div.s ft3, ft5, ft4
.set noreorder
mul.s ft4, ft0, ft3
nop
mul.s ft5, ft1, ft3
nop
mul.s ft0, ft2, ft3
.set reorder
swc1 ft4, (a0)
swc1 ft5, (a1)
swc1 ft0, (a2)
jr ra
END(guNormalize)
src/libultra/mgu/scale.s
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#include "PR/asm.h"
#include "PR/regdef.h"
.text
.align 5
LEAF(guScale)
li.s ft0, 65536.0
mtc1 a1, ft1
mul.s ft2, ft1, ft0
trunc.w.s ft3, ft2
mfc1 t1, ft3
srl t2, t1, 0x10
sll t0, t2, 0x10
sw t0, 0x00(a0)
sll t2, t1, 0x10
sw t2, 0x20(a0)
mtc1 a2, ft1
mul.s ft2, ft1, ft0
trunc.w.s ft3, ft2
mfc1 t1, ft3
srl t0, t1, 0x10
sw t0, 0x08(a0)
and t2, t1, 0xFFFF
sw t2, 0x28(a0)
mtc1 a3, ft1
mul.s ft2, ft1, ft0
trunc.w.s ft3, ft2
mfc1 t1, ft3
srl t2, t1, 0x10
sll t0, t2, 0x10
sw t0, 0x14(a0)
sll t2, t1, 0x10
sw t2, 0x34(a0)
li t0, 1
sw t0, 0x1C(a0)
sw zero, 0x04(a0)
sw zero, 0x0C(a0)
sw zero, 0x10(a0)
sw zero, 0x18(a0)
sw zero, 0x24(a0)
sw zero, 0x2C(a0)
sw zero, 0x30(a0)
sw zero, 0x38(a0)
sw zero, 0x3C(a0)
jr ra
END(guScale)
src/libultra/mgu/translate.s
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#include "PR/asm.h"
#include "PR/regdef.h"
.text
.align 5
LEAF(guTranslate)
li.s ft0, 65536.0
mtc1 a1, ft1
mul.s ft2, ft1, ft0
trunc.w.s ft3, ft2
mfc1 t1, ft3
mtc1 a2, ft1
mul.s ft2, ft1, ft0
trunc.w.s ft3, ft2
mfc1 t3, ft3
srl t2, t1, 0x10
sll t0, t2, 0x10
srl t2, t3, 0x10
or t0, t0, t2
sw t0, 0x18(a0)
sll t0, t1, 0x10
sll t2, t3, 0x10
srl t2, t2, 0x10
or t0, t0, t2
sw t0, 0x38(a0)
mtc1 a3, ft1
mul.s ft2, ft1, ft0
trunc.w.s ft3, ft2
mfc1 t1, ft3
srl t2, t1, 0x10
sll t0, t2, 0x10
addu t0, t0, 1
sw t0, 0x1C(a0)
sll t2, t1, 0x10
sw t2, 0x3C(a0)
sw zero, 0x00(a0)
sw zero, 0x04(a0)
sw zero, 0x08(a0)
sw zero, 0x0C(a0)
sw zero, 0x10(a0)
sw zero, 0x14(a0)
sw zero, 0x20(a0)
sw zero, 0x24(a0)
sw zero, 0x28(a0)
sw zero, 0x2C(a0)
sw zero, 0x30(a0)
sw zero, 0x34(a0)
lui t0, (0x00010000 >> 16)
ori t0, (0x00010000 & 0xFFFF)
sw t0, (a0)
sw t0, 0x14(a0)
lui t0, (0x00000001 >> 16)
ori t0, (0x00000001 & 0xFFFF)
sw t0, 8(a0)
jr ra
END(guTranslate)