target-arm: A32/T32: Mask CRC value in calling code, not helper

Bring the 32-bit CRC helper functions into line with the A64 ones,
by masking the high bytes of the value in the calling code rather
than the helper. This is more efficient since we can determine the
mask at translation time.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 1401458125-27977-7-git-send-email-peter.maydell@linaro.org

1 files changed, 6 insertions, 19 deletions

diff --git a/target-arm/helper.c b/target-arm/helper.c
index 1e50a7840e..177ed076c7 100644
--- a/target-arm/helper.c
+++ b/target-arm/helper.c
@@ -5559,28 +5559,15 @@ int arm_rmode_to_sf(int rmode)
     return rmode;
 }
 
-static void crc_init_buffer(uint8_t *buf, uint32_t val, uint32_t bytes)
-{
-    memset(buf, 0, 4);
-
-    if (bytes == 1) {
-        buf[0] = val & 0xff;
-    } else if (bytes == 2) {
-        buf[0] = val & 0xff;
-        buf[1] = (val >> 8) & 0xff;
-    } else {
-        buf[0] = val & 0xff;
-        buf[1] = (val >> 8) & 0xff;
-        buf[2] = (val >> 16) & 0xff;
-        buf[3] = (val >> 24) & 0xff;
-    }
-}
-
+/* CRC helpers.
+ * The upper bytes of val (above the number specified by 'bytes') must have
+ * been zeroed out by the caller.
+ */
 uint32_t HELPER(crc32)(uint32_t acc, uint32_t val, uint32_t bytes)
 {
     uint8_t buf[4];
 
-    crc_init_buffer(buf, val, bytes);
+    stl_le_p(buf, val);
 
     /* zlib crc32 converts the accumulator and output to one's complement.  */
     return crc32(acc ^ 0xffffffff, buf, bytes) ^ 0xffffffff;
@@ -5590,7 +5577,7 @@ uint32_t HELPER(crc32c)(uint32_t acc, uint32_t val, uint32_t bytes)
 {
     uint8_t buf[4];
 
-    crc_init_buffer(buf, val, bytes);
+    stl_le_p(buf, val);
 
     /* Linux crc32c converts the output to one's complement.  */
     return crc32c(acc, buf, bytes) ^ 0xffffffff;