x86-asm: Fix lar opcode operands

lar can accept multiple sizes as well (wlx), like lsl.  When using
autosize it's important to look at the destination operand first;
when it's a register that one determines the size, not the input
operand.

1 files changed, 5 insertions, 1 deletions

diff --git a/i386-asm.c b/i386-asm.c
index 136fe60..71c451a 100644
--- a/i386-asm.c
+++ b/i386-asm.c
@@ -733,7 +733,11 @@ ST_FUNC void asm_opcode(TCCState *s1, int opcode)
         autosize = NBWLX-2;
 #endif
     if (s == autosize) {
-        for(i = 0; s == autosize && i < nb_ops; i++) {
+	/* Check for register operands providing hints about the size.
+	   Start from the end, i.e. destination operands.  This matters
+	   only for opcodes accepting different sized registers, lar and lsl
+	   are such opcodes.  */
+        for(i = nb_ops - 1; s == autosize && i >= 0; i--) {
             if ((ops[i].type & OP_REG) && !(op_type[i] & (OP_CL | OP_DX)))
                 s = reg_to_size[ops[i].type & OP_REG];
         }