From f463d544793ff83efd8b95d0bce5ec80fd8170f3 Mon Sep 17 00:00:00 2001
From: Miquel Sabaté Solà <mikisabate@gmail.com>
Date: Wed, 4 Dec 2024 21:42:37 +0100
Subject: Remove old test code
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There is some code that I had there after messing with some of the
topics on Uros' blog (https://popovicu.com/), but that became irrelevant
after working on some other projects (e.g. fbos) or on other examples.

This commit also brings about a major overhaul on the structure of the
project. Hopefully it's now at a more ready state.

Signed-off-by: Miquel Sabaté Solà <mikisabate@gmail.com>
---
 arch/riscv/usr/string.S | 111 ------------------------------------------------
 1 file changed, 111 deletions(-)
 delete mode 100644 arch/riscv/usr/string.S

(limited to 'arch/riscv/usr/string.S')

diff --git a/arch/riscv/usr/string.S b/arch/riscv/usr/string.S
deleted file mode 100644
index 3878074..0000000
--- a/arch/riscv/usr/string.S
+++ /dev/null
@@ -1,111 +0,0 @@
-.text
-
-.globl reverse_string
-.type reverse_string, @function
-
-// char * reverse_string(char *str);
-reverse_string:
-    // Return early on null pointer.
-    beq a0, zero, end
-
-    // Preserve the original pointer.
-    addi sp, sp, -8
-    sd a0, 0(sp)
-
-    // Set `t0` to point to the end of the string.
-    add t0, a0, zero
-set_end_ptr:
-    lbu t2, 0(t0)
-    beq t2, zero, end_ptr_done
-    addi t0, t0, 1
-    j set_end_ptr
-
-    // We are done iterating, if `a0` and `t0` are equal, then there's nothing
-    // to be done and we can return early. Otherwise decrement `t0` so it points
-    // to the byte right before the null termination.
-end_ptr_done:
-    beq a0, t0, reverse_done
-    addi t0, t0, -1
-
-reverse_loop:
-    // Swap values between the two pointers.
-    lb t1, 0(a0)
-    lb t2, 0(t0)
-    sb t1, 0(t0)
-    sb t2, 0(a0)
-
-    // Move pointers and check whether the pointers have already crossed. If
-    // they have not crossed yet there is still looping to be done. Otherwise
-    // we are done.
-    addi a0, a0, 1
-    addi t0, t0, -1
-    bltu a0, t0, reverse_loop
-
-reverse_done:
-    // Restore things back and return to the caller.
-    ld a0, 0(sp)
-    addi sp, sp, 8
-end:
-    jr ra
-
-.globl is_palindrome
-.type is_palindrome, @function
-
-// bool is_palindrome(char *str);
-is_palindrome:
-    // Return early on null pointer.
-    beq a0, zero, palindrome_no
-
-    // Set `t0` to point to the end of the string.
-    add t0, a0, zero
-pal_set_end_ptr:
-    lbu t2, 0(t0)
-    beq t2, zero, pal_end_ptr_done
-    addi t0, t0, 1
-    j pal_set_end_ptr
-
-    // We are done iterating, if `a0` and `t0` are equal, then there's nothing
-    // to be done and we can return early. Otherwise decrement `t0` so it points
-    // to the byte right before the null termination.
-pal_end_ptr_done:
-    beq a0, t0, palindrome_no
-    addi t0, t0, -1
-
-pal_loop:
-    // Swap values between the two pointers.
-    lb t1, 0(a0)
-    lb t2, 0(t0)
-    bne t1, t2, palindrome_no
-
-    // Move pointers and check whether the pointers have already crossed. If
-    // they have not crossed yet there is still looping to be done. Otherwise
-    // we are done.
-    addi a0, a0, 1
-    addi t0, t0, -1
-    bleu a0, t0, pal_loop
-
-palindrome_yes:
-    li a0, 1
-    jr ra
-
-palindrome_no:
-    li a0, 0
-    jr ra
-
-.globl mstrcmp
-.type mstrcmp, @function
-
-// int mstrcmp(const char *, const char *);
-mstrcmp:
-1:
-	lbu t0, 0(a0)
-	lbu t1, 0(a1)
-	bne t0, t1, 2f
-	addi a0, a0, 1
-	addi a1, a1, 1
-	bnez t0, 1b
-	li a0, 0
-	ret
-2:
-	sub a0, t0, t1
-	ret
-- 
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