printf(): Fetch args smarter (fetch from memory, slower, but also less opcodes/compares, and convenient for future;less repeatability)

src/console.asm

@@ -54,6 +54,7 @@ section .rodata
 section .bss
 	printfBuff	resb	bufferLength
 	printfNBuff	resb	32
+	printfArgs	resq	8*5
 section .text
 	global	print
 	global	puts
@@ -94,6 +95,12 @@ printf:
 	push	r14 ;current index of printfBuff
 	push	r15 ;where to return after flush
 
+	mov	[printfArgs], rsi
+	mov	[printfArgs+8], rdx
+	mov	[printfArgs+16], rcx
+	mov	[printfArgs+24], r8
+	mov	[printfArgs+32], r9
+
 	xor	r10, r10
 	xor	r14, r14
 	lea	r11, [rel printfBuff]
@@ -131,22 +138,11 @@ printf:
 
 			;--- %d ---;
 			.rep_d:
-			cmp	r10, 0
-			cmove	rdi, rsi
-			je	.convertInt
-			cmp	r10, 1
-			cmove	rdi, rdx
-			je	.convertInt
-			cmp	r10, 2
-			cmove	rdi, rcx
-			je	.convertInt
-			cmp	r10, 3
-			cmove	rdi, r8
-			je	.convertInt
 			cmp	r10, 4
-			cmove	rdi, r9
-			je	.convertInt
-
+			ja	.d_fromStack
+			mov	rdi, [printfArgs + r10*8]
+			jmp	.convertInt
+			.d_fromStack:
 			mov	rdi, qword [rbp + 16 + (r10-5)*8]
 
 			.convertInt:
@@ -171,22 +167,11 @@ printf:
 
 			;--- %c ---;
 			.rep_c:
-			cmp	r10, 0
-			cmove	rdi, rsi
-			je	.charToStr
-			cmp	r10, 1
-			cmove	rdi, rdx
-			je	.charToStr
-			cmp	r10, 2
-			cmove	rdi, rcx
-			je	.charToStr
-			cmp	r10, 3
-			cmove	rdi, r8
-			je	.charToStr
 			cmp	r10, 4
-			cmove	rdi, r9
-			je	.charToStr
-		
+			ja	.c_fromStack
+			mov	rdi, [printfArgs + r10*8]
+			jmp	.charToStr
+			.c_fromStack:
 			mov	rdi, qword [rbp + 16 + (r10-5)*8]
 
 			.charToStr:
@@ -198,21 +183,11 @@ printf:
 
 			;--- %s ---;
 			.rep_s:
-			cmp	r10, 0
-			je	.insertLoop
-			cmp	r10, 1
-			cmove	rsi, rdx
-			je	.insertLoop
-			cmp	r10, 2
-			cmove	rsi, rcx
-			je	.insertLoop
-			cmp	r10, 3
-			cmove	rsi, r8
-			je	.insertLoop
 			cmp	r10, 4
-			cmove	rsi, r9
-			je	.insertLoop
-
+			ja	.s_fromStack
+			mov	rsi, [printfArgs + r10*8]
+			jmp	.insertLoop
+			.s_fromStack:
 			mov	rsi, qword [rbp + 16 + (r10-5)*8]
 
 			;--- Move fetched data to buffer ---;

src/tests.asm

@@ -252,7 +252,7 @@ _start:
 	push	0
 	push	tS6
 	push	tS5
-	push	qword [num4]
+	push	qword [rel num4]
 	call	printf
 	add	rsp, 8*8
 	mov	rsi, rax