tcg: Replace REG_P with arg_loc_reg_p

An inline function is safer than a macro, and REG_P
was rather too generic.

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

1 files changed, 13 insertions, 3 deletions

diff --git a/tcg/tcg.c b/tcg/tcg.c
index 6f5daaee5f..fa28db0188 100644
--- a/tcg/tcg.c
+++ b/tcg/tcg.c
@@ -806,6 +806,16 @@ static void init_ffi_layouts(void)
 }
 #endif /* CONFIG_TCG_INTERPRETER */
 
+static inline bool arg_slot_reg_p(unsigned arg_slot)
+{
+    /*
+     * Split the sizeof away from the comparison to avoid Werror from
+     * "unsigned < 0 is always false", when iarg_regs is empty.
+     */
+    unsigned nreg = ARRAY_SIZE(tcg_target_call_iarg_regs);
+    return arg_slot < nreg;
+}
+
 typedef struct TCGCumulativeArgs {
     int arg_idx;                /* tcg_gen_callN args[] */
     int info_in_idx;            /* TCGHelperInfo in[] */
@@ -3231,7 +3241,7 @@ liveness_pass_1(TCGContext *s)
                         case TCG_CALL_ARG_NORMAL:
                         case TCG_CALL_ARG_EXTEND_U:
                         case TCG_CALL_ARG_EXTEND_S:
-                            if (REG_P(loc)) {
+                            if (arg_slot_reg_p(loc->arg_slot)) {
                                 *la_temp_pref(ts) = 0;
                                 break;
                             }
@@ -3258,7 +3268,7 @@ liveness_pass_1(TCGContext *s)
                     case TCG_CALL_ARG_NORMAL:
                     case TCG_CALL_ARG_EXTEND_U:
                     case TCG_CALL_ARG_EXTEND_S:
-                        if (REG_P(loc)) {
+                        if (arg_slot_reg_p(loc->arg_slot)) {
                             tcg_regset_set_reg(*la_temp_pref(ts),
                                 tcg_target_call_iarg_regs[loc->arg_slot]);
                         }
@@ -4833,7 +4843,7 @@ static void load_arg_stk(TCGContext *s, int stk_slot, TCGTemp *ts,
 static void load_arg_normal(TCGContext *s, const TCGCallArgumentLoc *l,
                             TCGTemp *ts, TCGRegSet *allocated_regs)
 {
-    if (REG_P(l)) {
+    if (arg_slot_reg_p(l->arg_slot)) {
         TCGReg reg = tcg_target_call_iarg_regs[l->arg_slot];
         load_arg_reg(s, reg, ts, *allocated_regs);
         tcg_regset_set_reg(*allocated_regs, reg);