tcg: Move temp_idx and tcgv_i32_temp debug out of line

Removes a multiplicity of calls to __assert_fail, saving up
to 360kiB of .text space as measured on an x86_64 host.

Old     New     Less    %Change
9257272	8888680	368592	3.98%	qemu-system-aarch64
6100968	5911832	189136	3.10%	qemu-system-riscv64
5839112	5707032	132080	2.26%	qemu-system-mips
4447608	4341752	105856	2.38%	qemu-system-s390x

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

include/tcg/tcg.h

@@ -630,13 +630,6 @@ static inline void *tcg_splitwx_to_rw(const void *rx)
 }
 #endif
 
-static inline size_t temp_idx(TCGTemp *ts)
-{
-    ptrdiff_t n = ts - tcg_ctx->temps;
-    tcg_debug_assert(n >= 0 && n < tcg_ctx->nb_temps);
-    return n;
-}
-
 static inline TCGArg temp_arg(TCGTemp *ts)
 {
     return (uintptr_t)ts;
@@ -647,16 +640,25 @@ static inline TCGTemp *arg_temp(TCGArg a)
     return (TCGTemp *)(uintptr_t)a;
 }
 
-/* Using the offset of a temporary, relative to TCGContext, rather than
-   its index means that we don't use 0.  That leaves offset 0 free for
-   a NULL representation without having to leave index 0 unused.  */
+#ifdef CONFIG_DEBUG_TCG
+size_t temp_idx(TCGTemp *ts);
+TCGTemp *tcgv_i32_temp(TCGv_i32 v);
+#else
+static inline size_t temp_idx(TCGTemp *ts)
+{
+    return ts - tcg_ctx->temps;
+}
+
+/*
+ * Using the offset of a temporary, relative to TCGContext, rather than
+ * its index means that we don't use 0.  That leaves offset 0 free for
+ * a NULL representation without having to leave index 0 unused.
+ */
 static inline TCGTemp *tcgv_i32_temp(TCGv_i32 v)
 {
-    uintptr_t o = (uintptr_t)v;
-    TCGTemp *t = (void *)tcg_ctx + o;
-    tcg_debug_assert(offsetof(TCGContext, temps[temp_idx(t)]) == o);
-    return t;
+    return (void *)tcg_ctx + (uintptr_t)v;
 }
+#endif
 
 static inline TCGTemp *tcgv_i64_temp(TCGv_i64 v)
 {

tcg/tcg.c

@@ -1800,6 +1800,25 @@ TCGv_vec tcg_constant_vec_matching(TCGv_vec match, unsigned vece, int64_t val)
     return tcg_constant_vec(t->base_type, vece, val);
 }
 
+#ifdef CONFIG_DEBUG_TCG
+size_t temp_idx(TCGTemp *ts)
+{
+    ptrdiff_t n = ts - tcg_ctx->temps;
+    assert(n >= 0 && n < tcg_ctx->nb_temps);
+    return n;
+}
+
+TCGTemp *tcgv_i32_temp(TCGv_i32 v)
+{
+    uintptr_t o = (uintptr_t)v - offsetof(TCGContext, temps);
+
+    assert(o < sizeof(TCGTemp) * tcg_ctx->nb_temps);
+    assert(o % sizeof(TCGTemp) == 0);
+
+    return (void *)tcg_ctx + (uintptr_t)v;
+}
+#endif /* CONFIG_DEBUG_TCG */
+
 /* Return true if OP may appear in the opcode stream.
    Test the runtime variable that controls each opcode.  */
 bool tcg_op_supported(TCGOpcode op)