tcg: Implement gvec support for rotate by immediate

No host backend support yet, but the interfaces for rotli
are in place.  Canonicalize immediate rotate to the left,
based on a survey of architectures, but provide both left
and right shift interfaces to the translators.

Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

1 files changed, 48 insertions, 0 deletions

diff --git a/accel/tcg/tcg-runtime-gvec.c b/accel/tcg/tcg-runtime-gvec.c
index ca449702e6..34b1030365 100644
--- a/accel/tcg/tcg-runtime-gvec.c
+++ b/accel/tcg/tcg-runtime-gvec.c
@@ -716,6 +716,54 @@ void HELPER(gvec_sar64i)(void *d, void *a, uint32_t desc)
     clear_high(d, oprsz, desc);
 }
 
+void HELPER(gvec_rotl8i)(void *d, void *a, uint32_t desc)
+{
+    intptr_t oprsz = simd_oprsz(desc);
+    int shift = simd_data(desc);
+    intptr_t i;
+
+    for (i = 0; i < oprsz; i += sizeof(uint8_t)) {
+        *(uint8_t *)(d + i) = rol8(*(uint8_t *)(a + i), shift);
+    }
+    clear_high(d, oprsz, desc);
+}
+
+void HELPER(gvec_rotl16i)(void *d, void *a, uint32_t desc)
+{
+    intptr_t oprsz = simd_oprsz(desc);
+    int shift = simd_data(desc);
+    intptr_t i;
+
+    for (i = 0; i < oprsz; i += sizeof(uint16_t)) {
+        *(uint16_t *)(d + i) = rol16(*(uint16_t *)(a + i), shift);
+    }
+    clear_high(d, oprsz, desc);
+}
+
+void HELPER(gvec_rotl32i)(void *d, void *a, uint32_t desc)
+{
+    intptr_t oprsz = simd_oprsz(desc);
+    int shift = simd_data(desc);
+    intptr_t i;
+
+    for (i = 0; i < oprsz; i += sizeof(uint32_t)) {
+        *(uint32_t *)(d + i) = rol32(*(uint32_t *)(a + i), shift);
+    }
+    clear_high(d, oprsz, desc);
+}
+
+void HELPER(gvec_rotl64i)(void *d, void *a, uint32_t desc)
+{
+    intptr_t oprsz = simd_oprsz(desc);
+    int shift = simd_data(desc);
+    intptr_t i;
+
+    for (i = 0; i < oprsz; i += sizeof(uint64_t)) {
+        *(uint64_t *)(d + i) = rol64(*(uint64_t *)(a + i), shift);
+    }
+    clear_high(d, oprsz, desc);
+}
+
 void HELPER(gvec_shl8v)(void *d, void *a, void *b, uint32_t desc)
 {
     intptr_t oprsz = simd_oprsz(desc);