From b1ff7e8bf24b40cf64127a6194d45661db3a4baf Mon Sep 17 00:00:00 2001
From: Carson Fleming <cflems@cflems.net>
Date: Fri, 31 Jul 2026 23:52:09 -0400
Subject: code gen can use registers besides RAX now

---
 register.c | 119 +++++++++++++++++++++++++++++++++++++++++++++++++------------
 1 file changed, 97 insertions(+), 22 deletions(-)

(limited to 'register.c')

diff --git a/register.c b/register.c
index fe1a718..f197513 100644
--- a/register.c
+++ b/register.c
@@ -1,48 +1,123 @@
 #include "register.h"
+#include <stddef.h>
 
-const struct reg RAX = {
+struct reg RAX = {
     .qword = "rax",
     .dword = "eax",
     .word = "ax",
     .byte = "al",
+    .is_occupied = false,
 };
-const struct reg RDI = {
+struct reg RBX = {
+    .qword = "rbx",
+    .dword = "ebx",
+    .word = "bx",
+    .byte = "bl",
+    .is_occupied = false,
+};
+struct reg RCX = {
+    .qword = "rcx",
+    .dword = "ecx",
+    .word = "cx",
+    .byte = "cl",
+    .is_occupied = false,
+};
+struct reg RDX = {
+    .qword = "rdx",
+    .dword = "edx",
+    .word = "dx",
+    .byte = "dl",
+    .is_occupied = false,
+};
+
+struct reg RDI = {
     .qword = "rdi",
     .dword = "edi",
     .word = "di",
     .byte = "dil",
+    .is_occupied = false,
 };
-const struct reg RSI = {
+struct reg RSI = {
     .qword = "rsi",
     .dword = "esi",
     .word = "si",
     .byte = "sil",
+    .is_occupied = false,
 };
-const struct reg RDX = {
-    .qword = "rdx",
-    .dword = "edx",
-    .word = "dx",
-    .byte = "dl",
+struct reg RSP = {
+    .qword = "rsp",
+    .dword = "esp",
+    .word = "sp",
+    .byte = "spl",
+    .is_occupied = true,
 };
-const struct reg R10 = {
-    .qword = "r10",
-    .dword = "r10d",
-    .word = "r10w",
-    .byte = "r10b",
+struct reg RBP = {
+    .qword = "rbp",
+    .dword = "ebp",
+    .word = "bp",
+    .byte = "bpl",
+    .is_occupied = true,
+};
+
+struct reg R8 = {
+    .qword = "r8",
+    .dword = "r8d",
+    .word = "r8w",
+    .byte = "r8b",
+    .is_occupied = false,
 };
-const struct reg R9 = {
+struct reg R9 = {
     .qword = "r9",
     .dword = "r9d",
     .word = "r9w",
     .byte = "r9b",
+    .is_occupied = false,
 };
-const struct reg R8 = {
-    .qword = "r8",
-    .dword = "r8d",
-    .word = "r8w",
-    .byte = "r8b",
+struct reg R10 = {
+    .qword = "r10",
+    .dword = "r10d",
+    .word = "r10w",
+    .byte = "r10b",
+    .is_occupied = false,
+};
+struct reg R11 = {
+    .qword = "r11",
+    .dword = "r11d",
+    .word = "r11w",
+    .byte = "r11b",
+    .is_occupied = false,
+};
+struct reg R12 = {
+    .qword = "r12",
+    .dword = "r12d",
+    .word = "r12w",
+    .byte = "r12b",
+    .is_occupied = false,
+};
+struct reg R13 = {
+    .qword = "r13",
+    .dword = "r13d",
+    .word = "r13w",
+    .byte = "r13b",
+    .is_occupied = false,
+};
+struct reg R14 = {
+    .qword = "r14",
+    .dword = "r14d",
+    .word = "r14w",
+    .byte = "r14b",
+    .is_occupied = false,
+};
+struct reg R15 = {
+    .qword = "r15",
+    .dword = "r15d",
+    .word = "r15w",
+    .byte = "r15b",
+    .is_occupied = false,
 };
 
-const struct reg* const CALLING_CONV[] = {&RDI, &RSI, &RDX, &R10, &R9, &R8};
-const unsigned char CC_N_REGS =
-    sizeof(CALLING_CONV) / sizeof(const struct reg* const);
+struct reg* const CALLING_CONV[] = {&RDI, &RSI, &RDX, &R10, &R9, &R8, NULL};
+struct reg* const DATA_REGS[] = {
+    &RDI, &RSI, &RAX, &RBX, &RCX, &RDX,
+    &R8, &R9, &R10, &R11, &R12, &R13, &R14, &R15, NULL
+};
-- 
cgit v1.2.3