LibC: Add SSE2 non-temporal memset and memcpy

Also cleanup other assembly by using local labels to emit them from the assembled program.
2026-04-11 00:45:52 +03:00
parent d11160d2f7
commit 2a9dad2dd8
5 changed files with 254 additions and 44 deletions
--- a/kernel/klibc/arch/x86_64/string.S
+++ b/kernel/klibc/arch/x86_64/string.S
@@ -0,0 +1,31 @@
+.align 16
+.global memcpy
+memcpy:
+	movq %rdi, %rax
+	movq %rdx, %rcx
+	rep movsb
+	ret
+
+.align 16
+.global memmove
+memmove:
+	cmpq %rdi, %rsi
+	jae memcpy
+	movq %rdi, %rax
+	leaq -1(%rdi, %rdx), %rdi
+	leaq -1(%rsi, %rdx), %rsi
+	movq %rdx, %rcx
+	std
+	rep movsb
+	cld
+	ret
+
+.align 16
+.global memset
+memset:
+	movq %rdi, %r8
+	movb %sil, %al
+	movq %rdx, %rcx
+	rep stosb
+	movq %r8, %rax
+	ret