[PULL 16/18] target/ppc: fix vextu[bhw][lr]x helpers

[David Gibson <david@gibson.dropbear.id.au>]

From: Matheus Ferst <matheus.ferst@eldorado.org.br>

These helpers shouldn't depend on the host endianness, as they only use
shifts, ands, and int128_* methods.

Fixes: 60caf2216bf0 ("target-ppc: add vextu[bhw][lr]x instructions")
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Matheus Ferst <matheus.ferst@eldorado.org.br>
Message-Id: <20210826141446.2488609-3-matheus.ferst@eldorado.org.br>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
---
 target/ppc/int_helper.c | 38 ++++++++++----------------------------
 1 file changed, 10 insertions(+), 28 deletions(-)

diff --git a/target/ppc/int_helper.c b/target/ppc/int_helper.c
index efa833ef64..c2d3248d1e 100644
--- a/target/ppc/int_helper.c
+++ b/target/ppc/int_helper.c
@@ -1492,34 +1492,16 @@ void helper_vlogefp(CPUPPCState *env, ppc_avr_t *r, ppc_avr_t *b)
     }
 }
 
-#if defined(HOST_WORDS_BIGENDIAN)
-#define VEXTU_X_DO(name, size, left)                                \
-    target_ulong glue(helper_, name)(target_ulong a, ppc_avr_t *b)  \
-    {                                                               \
-        int index;                                                  \
-        if (left) {                                                 \
-            index = (a & 0xf) * 8;                                  \
-        } else {                                                    \
-            index = ((15 - (a & 0xf) + 1) * 8) - size;              \
-        }                                                           \
-        return int128_getlo(int128_rshift(b->s128, index)) &        \
-            MAKE_64BIT_MASK(0, size);                               \
-    }
-#else
-#define VEXTU_X_DO(name, size, left)                                \
-    target_ulong glue(helper_, name)(target_ulong a, ppc_avr_t *b)  \
-    {                                                               \
-        int index;                                                  \
-        if (left) {                                                 \
-            index = ((15 - (a & 0xf) + 1) * 8) - size;              \
-        } else {                                                    \
-            index = (a & 0xf) * 8;                                  \
-        }                                                           \
-        return int128_getlo(int128_rshift(b->s128, index)) &        \
-            MAKE_64BIT_MASK(0, size);                               \
-    }
-#endif
-
+#define VEXTU_X_DO(name, size, left)                            \
+target_ulong glue(helper_, name)(target_ulong a, ppc_avr_t *b)  \
+{                                                               \
+    int index = (a & 0xf) * 8;                                  \
+    if (left) {                                                 \
+        index = 128 - index - size;                             \
+    }                                                           \
+    return int128_getlo(int128_rshift(b->s128, index)) &        \
+        MAKE_64BIT_MASK(0, size);                               \
+}
 VEXTU_X_DO(vextublx,  8, 1)
 VEXTU_X_DO(vextuhlx, 16, 1)
 VEXTU_X_DO(vextuwlx, 32, 1)
-- 
2.31.1