From b00a52ea9b506279390aad76aafe02acaaed2a6f Mon Sep 17 00:00:00 2001
From: Madeline Busig <madeline.busig@outlook.com>
Date: Mon, 25 Mar 2024 17:11:49 -0600
Subject: [PATCH] Add armv4t assembly macros for division by 10^x, x=[1,9]

---
 include/mtl/armv4t/asm/math.s | 48 +++++++++++++++++++++++++++++++++++
 1 file changed, 48 insertions(+)

diff --git a/include/mtl/armv4t/asm/math.s b/include/mtl/armv4t/asm/math.s
index 2020215..9333c3e 100644
--- a/include/mtl/armv4t/asm/math.s
+++ b/include/mtl/armv4t/asm/math.s
@@ -15,6 +15,54 @@
 	lsrs	\rd, $3
 .endm
 
+.macro udiv100 rd, rx, rt
+	ldr	\rt, =0x51EB851F
+	umull	\rt, \rd, \rx, \rt
+	lsrs	\rd, $5
+.endm
+
+.macro udiv1000 rd, rx, rt
+	ldr	\rt, =0x10624DD3
+	umull	\rt, \rd, \rx, \rt
+	lsrs	\rd, $6
+.endm
+
+.macro udiv10000 rd, rx, rt
+	ldr	\rt, =0xD1B71759
+	umull	\rt, \rd, \rx, \rt
+	lsrs	\rd, $13
+.endm
+
+.macro udiv100000 rd, rx, rt
+	ldr	\rt, =0x29f17
+	umull	\rt, \rd, \rx, \rt
+	lsrs	\rd, $2
+.endm
+
+.macro udiv1000000 rd, rx, rt
+	ldr	\rt, =0x431BDE83
+	umull	\rt, \rd, \rx, \rt
+	lsrs	\rd, $18
+.endm
+
+.macro udiv10000000 rd, rx, rt
+	ldr	\rt, =0x6B5FCA6B
+	umull	\rt, \rd, \rx, \rt
+	lsrs	\rd, $22
+.endm
+
+.macro udiv100000000 rd, rx, rt
+	ldr	\rt, =0x55E63B89
+	umull	\rt, \rd, \rx, \rt
+	lsrs	\rd, $25
+.endm
+
+.macro udiv1000000000 rd, rx, rt
+	ldr	\rt, =0x44b82fa1
+	umull	\rt, \rd, \rx, \rt
+	lsrs	\rd, $28
+.endm
+
 /*
  * Calculates rx % 10 and places the result in rd. Clobbers the value of
  * temporary register rt