Use rcx as scratch register, since it is caller-saved in the System V and Microsoft calling conventions

1 files changed, 17 insertions, 17 deletions

diff --git a/sjit_c.c b/sjit_c.c
index 54c43dc..50e8f57 100644
--- a/sjit_c.c
+++ b/sjit_c.c
@@ -54,12 +54,12 @@ static inline void gen_instr(char *full_code, char **code_p, uint64_t **pgm_p, u
 #ifdef DEBUG_JIT_INSTRUCTIONS
 			fprintf(stderr,"PushRef %lu\n",arg);
 #endif
-			code[0]='\x48'; /* mov rbx,[rsp+ARG*8] */
+			code[0]='\x48'; /* mov rcx,[rsp+ARG*8] */
 			code[1]='\x8b';
-			code[2]='\x5c';
+			code[2]='\x4c';
 			code[3]='\x24';
 			code[4]=(unsigned char)arg*8;
-			code[5]='\x53'; /* push rbx */
+			code[5]='\x51'; /* push rcx */
 			pgm+=2;
 			code+=6;
 			break;
@@ -68,11 +68,11 @@ static inline void gen_instr(char *full_code, char **code_p, uint64_t **pgm_p, u
 #ifdef DEBUG_JIT_INSTRUCTIONS
 			fprintf(stderr,"PushI %lu\n",arg);
 #endif
-			code[0]='\x48'; /* mov rbx,ARG */
+			code[0]='\x48'; /* mov rcx,ARG */
 			code[1]='\xc7';
-			code[2]='\xc3';
+			code[2]='\xc1';
 			*(uint32_t*)&code[3]=(uint32_t)arg;
-			code[7]='\x53'; /* push rbx */
+			code[7]='\x51'; /* push rcx */
 			pgm+=2;
 			code+=8;
 			break;
@@ -81,10 +81,10 @@ static inline void gen_instr(char *full_code, char **code_p, uint64_t **pgm_p, u
 #ifdef DEBUG_JIT_INSTRUCTIONS
 			fprintf(stderr,"Put %lu\n",arg);
 #endif
-			code[0]='\x5b'; /* pop rbx */
-			code[1]='\x48'; /* mov [rsp+ARG*8],rbx */
+			code[0]='\x59'; /* pop rcx */
+			code[1]='\x48'; /* mov [rsp+ARG*8],rcx */
 			code[2]='\x89';
-			code[3]='\x5c';
+			code[3]='\x4c';
 			code[4]='\x24';
 			code[5]=(unsigned char)(arg-1)*8;
 			pgm+=2;
@@ -140,27 +140,27 @@ static inline void gen_instr(char *full_code, char **code_p, uint64_t **pgm_p, u
 #endif
 			/* mov rax,[rsp+8] */
 			code[0]='\x48'; code[1]='\x8b'; code[2]='\x44'; code[3]='\x24'; code[4]='\x08';
-			/* mov rbx,[rsp+16] */
-			code[5]='\x48'; code[6]='\x8b'; code[7]='\x5c'; code[8]='\x24'; code[9]='\x10';
+			/* mov rcx,[rsp+16] */
+			code[5]='\x48'; code[6]='\x8b'; code[7]='\x4c'; code[8]='\x24'; code[9]='\x10';
 			switch (*pgm) {
 				case IAddRet:
 				case ISubRet:
-					/* {add,sub} rax,rbx */
+					/* {add,sub} rax,rcx */
 					code[10]='\x48';
 					code[11]=*pgm==IAddRet ? '\x01' : '\x29';
-					code[12]='\xd8';
+					code[12]='\xc8';
 					code+=13;
 					break;
 				case IMulRet:
-					/* imul rax,rbx */
-					code[10]='\x48'; code[11]='\x0f'; code[12]='\xaf'; code[13]='\xc3';
+					/* imul rax,rcx */
+					code[10]='\x48'; code[11]='\x0f'; code[12]='\xaf'; code[13]='\xc1';
 					code+=14;
 					break;
 				case IDivRet:
 					/* xor rdx,rdx */
 					code[10]='\x48'; code[11]='\x31'; code[12]='\xd2';
-					/* idiv rbx */
-					code[13]='\x48'; code[14]='\xf7'; code[15]='\xfb';
+					/* idiv rcx */
+					code[13]='\x48'; code[14]='\xf7'; code[15]='\xf9';
 					code+=16;
 					break;
 			}