tcg/i386: Introduce tcg_out_testi

Split out a helper for choosing testb vs testl.

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

tcg/i386/tcg-target.c.inc

@@ -1751,6 +1751,23 @@ static void tcg_out_nopn(TCGContext *s, int n)
     tcg_out8(s, 0x90);
 }
 
+/* Test register R vs immediate bits I, setting Z flag for EQ/NE. */
+static void __attribute__((unused))
+tcg_out_testi(TCGContext *s, TCGReg r, uint32_t i)
+{
+    /*
+     * This is used for testing alignment, so we can usually use testb.
+     * For i686, we have to use testl for %esi/%edi.
+     */
+    if (i <= 0xff && (TCG_TARGET_REG_BITS == 64 || r < 4)) {
+        tcg_out_modrm(s, OPC_GRP3_Eb | P_REXB_RM, EXT3_TESTi, r);
+        tcg_out8(s, i);
+    } else {
+        tcg_out_modrm(s, OPC_GRP3_Ev, EXT3_TESTi, r);
+        tcg_out32(s, i);
+    }
+}
+
 typedef struct {
     TCGReg base;
     int index;
@@ -2051,18 +2068,7 @@ static void tcg_out_test_alignment(TCGContext *s, bool is_ld, TCGReg addrlo,
     unsigned a_mask = (1 << a_bits) - 1;
     TCGLabelQemuLdst *label;
 
-    /*
-     * We are expecting a_bits to max out at 7, so we can usually use testb.
-     * For i686, we have to use testl for %esi/%edi.
-     */
-    if (a_mask <= 0xff && (TCG_TARGET_REG_BITS == 64 || addrlo < 4)) {
-        tcg_out_modrm(s, OPC_GRP3_Eb | P_REXB_RM, EXT3_TESTi, addrlo);
-        tcg_out8(s, a_mask);
-    } else {
-        tcg_out_modrm(s, OPC_GRP3_Ev, EXT3_TESTi, addrlo);
-        tcg_out32(s, a_mask);
-    }
-
+    tcg_out_testi(s, addrlo, a_mask);
     /* jne slow_path */
     tcg_out_opc(s, OPC_JCC_long + JCC_JNE, 0, 0, 0);