fix fucompp emitter when no register is needed

[libfirm] / ir / be / ia32 / ia32_emitter.c

diff --git a/ir/be/ia32/ia32_emitter.c b/ir/be/ia32/ia32_emitter.c
index 579e990..fa2cf13 100644 (file)
--- a/ir/be/ia32/ia32_emitter.c
+++ b/ir/be/ia32/ia32_emitter.c
@@ -1000,7 +1000,7 @@ static void emit_ia32_x87CondJmp(ir_node *irn, ia32_emit_env_t *env) {
        if (reverse)
                set_ia32_pncode(irn, (long)get_inversed_pnc(get_ia32_pncode(irn)));
 
-       snprintf(cmd_buf, SNPRINTF_BUF_LEN, "%s %%%s", instr, reg);
+       snprintf(cmd_buf, SNPRINTF_BUF_LEN, "%s %s%s", instr, reg[0] == '\0' ? "" : "%", reg);
        lc_esnprintf(ia32_get_arg_env(), cmnt_buf, SNPRINTF_BUF_LEN, "/* %+F */", irn);
        IA32_DO_EMIT(irn);
        lc_esnprintf(ia32_get_arg_env(), cmd_buf, SNPRINTF_BUF_LEN, "fnstsw %%ax", irn);