[PATCH 05/12] tcg/tcg-op: Factor tcg_gen_hrev64_i64() out

["Philippe Mathieu-Daudé" <philmd@linaro.org>]

Similarly to tcg_gen_hrev32_i32() for 32-bit values,
extract tcg_gen_hrev64_i64() for 64-bit ones.

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
---
 docs/devel/tcg-ops.rst      |  4 +++-
 include/tcg/tcg-op-common.h |  1 +
 tcg/tcg-op.c                | 29 +++++++++++++++++++++++------
 3 files changed, 27 insertions(+), 7 deletions(-)

diff --git a/docs/devel/tcg-ops.rst b/docs/devel/tcg-ops.rst
index 17965faa03..e8a2f8aacc 100644
--- a/docs/devel/tcg-ops.rst
+++ b/docs/devel/tcg-ops.rst
@@ -492,7 +492,9 @@ Misc
 
    * - hrev32_i32 *t0*, *t1*
 
-     - | Byteswap each halfword within a 32-bit value.
+       hrev64_i64 *t0*, *t1*
+
+     - | Byteswap each halfword within a 32/64-bit value.
 
    * - hswap_i32/i64 *t0*, *t1*
 
diff --git a/include/tcg/tcg-op-common.h b/include/tcg/tcg-op-common.h
index bb515dfd51..a9184caf9d 100644
--- a/include/tcg/tcg-op-common.h
+++ b/include/tcg/tcg-op-common.h
@@ -562,6 +562,7 @@ 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_hrev64_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);
diff --git a/tcg/tcg-op.c b/tcg/tcg-op.c
index b1b5d9b45b..310acce410 100644
--- a/tcg/tcg-op.c
+++ b/tcg/tcg-op.c
@@ -1876,12 +1876,7 @@ void tcg_gen_bswap64_i64(TCGv_i64 ret, TCGv_i64 arg)
         TCGv_i64 t2 = tcg_temp_ebb_new_i64();
 
                                         /* arg = abcdefgh */
-        tcg_gen_movi_i64(t2, 0x00ff00ff00ff00ffull);
-        tcg_gen_shri_i64(t0, arg, 8);   /*  t0 = .abcdefg */
-        tcg_gen_and_i64(t1, arg, t2);   /*  t1 = .b.d.f.h */
-        tcg_gen_and_i64(t0, t0, t2);    /*  t0 = .a.c.e.g */
-        tcg_gen_shli_i64(t1, t1, 8);    /*  t1 = b.d.f.h. */
-        tcg_gen_or_i64(ret, t0, t1);    /* ret = badcfehg */
+        tcg_gen_hrev64_i64(ret, arg);   /* ret = badcfehg */
 
         tcg_gen_movi_i64(t2, 0x0000ffff0000ffffull);
         tcg_gen_shri_i64(t0, ret, 16);  /*  t0 = ..badcfe */
@@ -1936,6 +1931,28 @@ void tcg_gen_wswap_i64(TCGv_i64 ret, TCGv_i64 arg)
     tcg_gen_rotli_i64(ret, arg, 32);
 }
 
+/*
+ * hrev64_i64: Byteswap each halfwords within a 64-bit value.
+ *
+ * Byte pattern:  hrev64_i64(abcdefgh) -> badcfehg
+ */
+void tcg_gen_hrev64_i64(TCGv_i64 ret, TCGv_i64 arg)
+{
+    TCGv_i64 mask = tcg_constant_i64(0x00ff00ff00ff00ffull);
+    TCGv_i64 t1 = tcg_temp_ebb_new_i64();
+    TCGv_i64 t2 = tcg_temp_ebb_new_i64();
+
+                                        /* arg = abcdefgh */
+    tcg_gen_shri_i64(t1, arg, 8);       /*  t1 = .abcdefg */
+    tcg_gen_and_i64(t2, t1, mask);      /*  t2 = .a.c.e.g */
+    tcg_gen_and_i64(t1, arg, mask);     /*  t1 = .b.d.f.h */
+    tcg_gen_shli_i64(t1, t1, 8);        /*  t1 = b.d.f.h. */
+    tcg_gen_or_i64(ret, t1, t2);        /* ret = badcfehg */
+
+    tcg_temp_free_i64(t1);
+    tcg_temp_free_i64(t2);
+}
+
 void tcg_gen_not_i64(TCGv_i64 ret, TCGv_i64 arg)
 {
     if (TCG_TARGET_REG_BITS == 32) {
-- 
2.41.0