tcg: Implement tcg_gen_{h,w}swap_{i32,i64}

Swap half-words (16-bit) and words (32-bit) within a larger value.
Mirrors functions of the same names within include/qemu/bitops.h.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: David Hildenbrand <david@redhat.com>
Reviewed-by: David Miller <dmiller423@gmail.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Message-Id: <20220428094708.84835-5-david@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>

include/tcg/tcg-op.h

@@ -332,6 +332,7 @@ void tcg_gen_ext8u_i32(TCGv_i32 ret, TCGv_i32 arg);
 void tcg_gen_ext16u_i32(TCGv_i32 ret, TCGv_i32 arg);
 void tcg_gen_bswap16_i32(TCGv_i32 ret, TCGv_i32 arg, int flags);
 void tcg_gen_bswap32_i32(TCGv_i32 ret, TCGv_i32 arg);
+void tcg_gen_hswap_i32(TCGv_i32 ret, TCGv_i32 arg);
 void tcg_gen_smin_i32(TCGv_i32, TCGv_i32 arg1, TCGv_i32 arg2);
 void tcg_gen_smax_i32(TCGv_i32, TCGv_i32 arg1, TCGv_i32 arg2);
 void tcg_gen_umin_i32(TCGv_i32, TCGv_i32 arg1, TCGv_i32 arg2);
@@ -531,6 +532,8 @@ void tcg_gen_ext32u_i64(TCGv_i64 ret, TCGv_i64 arg);
 void tcg_gen_bswap16_i64(TCGv_i64 ret, TCGv_i64 arg, int flags);
 void tcg_gen_bswap32_i64(TCGv_i64 ret, TCGv_i64 arg, int flags);
 void tcg_gen_bswap64_i64(TCGv_i64 ret, TCGv_i64 arg);
+void tcg_gen_hswap_i64(TCGv_i64 ret, TCGv_i64 arg);
+void tcg_gen_wswap_i64(TCGv_i64 ret, TCGv_i64 arg);
 void tcg_gen_smin_i64(TCGv_i64, TCGv_i64 arg1, TCGv_i64 arg2);
 void tcg_gen_smax_i64(TCGv_i64, TCGv_i64 arg1, TCGv_i64 arg2);
 void tcg_gen_umin_i64(TCGv_i64, TCGv_i64 arg1, TCGv_i64 arg2);
@@ -1077,6 +1080,8 @@ void tcg_gen_stl_vec(TCGv_vec r, TCGv_ptr base, TCGArg offset, TCGType t);
 #define tcg_gen_bswap32_tl tcg_gen_bswap32_i64
 #define tcg_gen_bswap64_tl tcg_gen_bswap64_i64
 #define tcg_gen_bswap_tl tcg_gen_bswap64_i64
+#define tcg_gen_hswap_tl tcg_gen_hswap_i64
+#define tcg_gen_wswap_tl tcg_gen_wswap_i64
 #define tcg_gen_concat_tl_i64 tcg_gen_concat32_i64
 #define tcg_gen_extr_i64_tl tcg_gen_extr32_i64
 #define tcg_gen_andc_tl tcg_gen_andc_i64
@@ -1192,6 +1197,7 @@ void tcg_gen_stl_vec(TCGv_vec r, TCGv_ptr base, TCGArg offset, TCGType t);
 #define tcg_gen_bswap16_tl tcg_gen_bswap16_i32
 #define tcg_gen_bswap32_tl(D, S, F) tcg_gen_bswap32_i32(D, S)
 #define tcg_gen_bswap_tl tcg_gen_bswap32_i32
+#define tcg_gen_hswap_tl tcg_gen_hswap_i32
 #define tcg_gen_concat_tl_i64 tcg_gen_concat_i32_i64
 #define tcg_gen_extr_i64_tl tcg_gen_extr_i64_i32
 #define tcg_gen_andc_tl tcg_gen_andc_i32

tcg/tcg-op.c

@@ -1056,6 +1056,12 @@ void tcg_gen_bswap32_i32(TCGv_i32 ret, TCGv_i32 arg)
     }
 }
 
+void tcg_gen_hswap_i32(TCGv_i32 ret, TCGv_i32 arg)
+{
+    /* Swapping 2 16-bit elements is a rotate. */
+    tcg_gen_rotli_i32(ret, arg, 16);
+}
+
 void tcg_gen_smin_i32(TCGv_i32 ret, TCGv_i32 a, TCGv_i32 b)
 {
     tcg_gen_movcond_i32(TCG_COND_LT, ret, a, b, a, b);
@@ -1792,6 +1798,30 @@ void tcg_gen_bswap64_i64(TCGv_i64 ret, TCGv_i64 arg)
     }
 }
 
+void tcg_gen_hswap_i64(TCGv_i64 ret, TCGv_i64 arg)
+{
+    uint64_t m = 0x0000ffff0000ffffull;
+    TCGv_i64 t0 = tcg_temp_new_i64();
+    TCGv_i64 t1 = tcg_temp_new_i64();
+
+    /* See include/qemu/bitops.h, hswap64. */
+    tcg_gen_rotli_i64(t1, arg, 32);
+    tcg_gen_andi_i64(t0, t1, m);
+    tcg_gen_shli_i64(t0, t0, 16);
+    tcg_gen_shri_i64(t1, t1, 16);
+    tcg_gen_andi_i64(t1, t1, m);
+    tcg_gen_or_i64(ret, t0, t1);
+
+    tcg_temp_free_i64(t0);
+    tcg_temp_free_i64(t1);
+}
+
+void tcg_gen_wswap_i64(TCGv_i64 ret, TCGv_i64 arg)
+{
+    /* Swapping 2 32-bit elements is a rotate. */
+    tcg_gen_rotli_i64(ret, arg, 32);
+}
+
 void tcg_gen_not_i64(TCGv_i64 ret, TCGv_i64 arg)
 {
     if (TCG_TARGET_REG_BITS == 32) {