From bfbd6830a829124fbccd254b07c613e5a4e14380 Mon Sep 17 00:00:00 2001
From: Zack Buhman <zack@buhman.org>
Date: Wed, 27 Dec 2023 23:56:57 +0800
Subject: [PATCH] add day1

---
 day1.s     |  126 +++++++
 gdb.script |    5 +
 input.txt  | 1000 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 1131 insertions(+)
 create mode 100644 day1.s
 create mode 100644 gdb.script
 create mode 100644 input.txt

diff --git a/day1.s b/day1.s
new file mode 100644
index 0000000..a9a52cc
--- /dev/null
+++ b/day1.s
@@ -0,0 +1,126 @@
+	.global _start
+_start:
+	mov #0,r0
+	lds r0,fpscr /* single-precision mode */
+
+parse_lines:
+
+_pointers:
+	mova input_start,r0
+	mov r0,r14                 /* r14: pointer to input start */
+	mov.l input_end,r0
+	mov r0,r15	           /* r15: pointer to input end */
+
+_constants:
+	fldi1 fr1       /* fr1: const 1 */
+	fldi1 fr2
+	fneg  fr2       /* fr2: const -1 */
+	fldi0 fr3       /* fr3: const 0 */
+
+_accumulator:
+	fldi0 fr9       /* fr9: sum of all values */
+
+_ascii_characters:
+	/* alternative sequence
+	mov #'\n',r10
+	lds r10,fpul
+	float fpul,fr10 /*  fr10: newline (10) /
+	mov #('0'-1),r10
+	lds r10,fpul
+	float fpul,fr11 /*  fr11: zero-1 (47) /
+	mov #'9',r10
+	lds r10,fpul
+	float fpul,fr12 /*  fr12: nine (57) /
+	fmov fr11,fr13
+	fadd fr1,fr13   /*  fr13: zero (48) /
+	*/
+
+	/* the less efficient sequence that uses more floating point
+	/* instructions: */
+	mova _ascii_newline,r0
+	fmov.s @r0+,fr0
+	flds fr0,fpul
+	float fpul,fr10 /* fr10: newline (10) */
+	fmov.s @r0+,fr0
+	flds fr0,fpul
+	float fpul,fr11 /* fr11: zero    (48) */
+	fmov fr11,fr12
+	fsub fr1,fr12   /* fr12: zero-1  (47) */
+	fmov.s @r0+,fr0
+	flds fr0,fpul
+	float fpul,fr13 /* fr13: nine    (57) */
+
+	bra parse_line
+	nop
+
+	.align 4
+_ascii_newline:
+	.byte '\n', 0, 0, 0
+_ascii_zero:
+	.byte '0' , 0, 0, 0
+_ascii_nine:
+	.byte '9' , 0, 0, 0
+
+parse_line:
+_parse_line_init:
+	fldi1 fr14
+	fneg  fr14 /* fr14: digit0 (-1) */
+	fldi1 fr15
+	fneg  fr15 /* fr15: digit1 (-1) */
+_parse_line_loop:
+	mov.b @r14+,r1   /* r1 = *r14++ */
+	lds r1,fpul
+	float fpul,fr0   /* fr0 = (float)r1 */
+	fcmp/eq fr0,fr10 /* fr0 == '\n' */
+	bt _parse_line_loop_exit
+	fcmp/eq fr3,fr10 /* fr0 == 0 */
+	bt _parse_line_loop_exit
+
+parse_num:
+	fcmp/gt fr12,fr0 /* fr0 >= '0' */
+	bf _parse_line_loop
+	fcmp/gt fr13,fr0 /* fr0 >  '9' */
+	bt _parse_line_loop
+
+	fsub fr11,fr0 /* fr0 -= '0' */
+	fcmp/eq fr14,fr2 /* fr14 == -1 */
+	bf _first_seen
+	fmov fr0,fr14
+_first_seen:
+	fmov fr0,fr15
+
+	bra _parse_line_loop
+	nop
+
+_parse_line_loop_exit:
+	fcmp/eq fr14,fr2
+	bt _parse_line_empty_line
+	/* coincidentally, ascii newline is also 10, which is exactly
+	/* the desired constant here */
+	fmul fr10,fr14 /* fr14 *= 10 */
+	fadd fr14,fr9
+	fadd fr15,fr9
+
+_parse_line_empty_line:
+_parse_line_next_line:
+	cmp/eq r14,r15
+	bf parse_line
+
+loop:
+	bra loop
+	nop
+
+	.align 4
+sample_input_start:
+	.ascii "1abc2\n"
+	.ascii "pqr3stu8vwx\n"
+	.ascii "a1b2c3d4e5f\n"
+	.ascii "treb7uchet\n"
+	.align 4, '\n'
+sample_input_end:
+
+input_end:
+	.long _input_end
+input_start:
+	.incbin "input.txt"
+_input_end:
diff --git a/gdb.script b/gdb.script
new file mode 100644
index 0000000..dd87a38
--- /dev/null
+++ b/gdb.script
@@ -0,0 +1,5 @@
+target extended-remote localhost:1234
+tui enable
+tui layout regs
+tui focus cmd
+tui reg all
diff --git a/input.txt b/input.txt
new file mode 100644
index 0000000..bb9803e
--- /dev/null
+++ b/input.txt
@@ -0,0 +1,1000 @@
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