[Qemu-devel] [PULL 05/19] target-tilegx: Implement crc instructions

[Richard Henderson <rth@twiddle.net>]

Signed-off-by: Richard Henderson <rth@twiddle.net>
---
 target-tilegx/helper.c    | 19 +++++++++++++++++++
 target-tilegx/helper.h    |  2 ++
 target-tilegx/translate.c |  8 +++++++-
 3 files changed, 28 insertions(+), 1 deletion(-)

diff --git a/target-tilegx/helper.c b/target-tilegx/helper.c
index a01bb8d..cad5dae 100644
--- a/target-tilegx/helper.c
+++ b/target-tilegx/helper.c
@@ -21,6 +21,7 @@
 #include "cpu.h"
 #include "qemu-common.h"
 #include "exec/helper-proto.h"
+#include <zlib.h> /* For crc32 */
 
 void helper_exception(CPUTLGState *env, uint32_t excp)
 {
@@ -78,3 +79,21 @@ uint64_t helper_shufflebytes(uint64_t dest, uint64_t srca, uint64_t srcb)
 
     return vdst;
 }
+
+uint64_t helper_crc32_8(uint64_t accum, uint64_t input)
+{
+    uint8_t buf = input;
+
+    /* zlib crc32 converts the accumulator and output to one's complement.  */
+    return crc32(accum ^ 0xffffffff, &buf, 1) ^ 0xffffffff;
+}
+
+uint64_t helper_crc32_32(uint64_t accum, uint64_t input)
+{
+    uint8_t buf[4];
+
+    stl_le_p(buf, input);
+
+    /* zlib crc32 converts the accumulator and output to one's complement.  */
+    return crc32(accum ^ 0xffffffff, buf, 4) ^ 0xffffffff;
+}
diff --git a/target-tilegx/helper.h b/target-tilegx/helper.h
index d380d3b..72c8e92 100644
--- a/target-tilegx/helper.h
+++ b/target-tilegx/helper.h
@@ -4,6 +4,8 @@ DEF_HELPER_FLAGS_1(cnttz, TCG_CALL_NO_RWG_SE, i64, i64)
 DEF_HELPER_FLAGS_1(pcnt, TCG_CALL_NO_RWG_SE, i64, i64)
 DEF_HELPER_FLAGS_1(revbits, TCG_CALL_NO_RWG_SE, i64, i64)
 DEF_HELPER_FLAGS_3(shufflebytes, TCG_CALL_NO_RWG_SE, i64, i64, i64, i64)
+DEF_HELPER_FLAGS_2(crc32_8, TCG_CALL_NO_RWG_SE, i64, i64, i64)
+DEF_HELPER_FLAGS_2(crc32_32, TCG_CALL_NO_RWG_SE, i64, i64, i64)
 
 DEF_HELPER_FLAGS_2(v1multu, TCG_CALL_NO_RWG_SE, i64, i64, i64)
 DEF_HELPER_FLAGS_2(v1shl, TCG_CALL_NO_RWG_SE, i64, i64, i64)
diff --git a/target-tilegx/translate.c b/target-tilegx/translate.c
index 6bfb1af..3e5a8ea 100644
--- a/target-tilegx/translate.c
+++ b/target-tilegx/translate.c
@@ -750,9 +750,15 @@ static TileExcp gen_rrr_opcode(DisasContext *dc, unsigned opext,
     case OE_RRR(CMULHR, 0, X0):
     case OE_RRR(CMULH, 0, X0):
     case OE_RRR(CMUL, 0, X0):
+        return TILEGX_EXCP_OPCODE_UNIMPLEMENTED;
     case OE_RRR(CRC32_32, 0, X0):
+        gen_helper_crc32_32(tdest, tsrca, tsrcb);
+        mnemonic = "crc32_32";
+        break;
     case OE_RRR(CRC32_8, 0, X0):
-        return TILEGX_EXCP_OPCODE_UNIMPLEMENTED;
+        gen_helper_crc32_8(tdest, tsrca, tsrcb);
+        mnemonic = "crc32_8";
+        break;
     case OE_RRR(DBLALIGN2, 0, X0):
     case OE_RRR(DBLALIGN2, 0, X1):
         gen_dblaligni(tdest, tsrca, tsrcb, 16);
-- 
2.4.3