tcg: Add tcg_gen_gvec_rotrs

Add tcg expander and helper functions for rotate right
vector with scalar operand.

Signed-off-by: Nazar Kazakov <nazar.kazakov@codethink.co.uk>
Message-Id: <20230428144757.57530-10-lawrence.hunter@codethink.co.uk>
[rth: Split out of larger patch; mask rotation count.]
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

diff --git a/include/tcg/tcg-op-gvec.h b/include/tcg/tcg-op-gvec.h
index 6d5868317154842c4e2d14cffb77fbdaca93412b..a8183bfeabeb04b6caadfac795d94e74d7f1f5c1 100644 (file)
--- a/include/tcg/tcg-op-gvec.h
+++ b/include/tcg/tcg-op-gvec.h
@@ -371,6 +371,8 @@ void tcg_gen_gvec_sars(unsigned vece, uint32_t dofs, uint32_t aofs,
                        TCGv_i32 shift, uint32_t oprsz, uint32_t maxsz);
 void tcg_gen_gvec_rotls(unsigned vece, uint32_t dofs, uint32_t aofs,
                         TCGv_i32 shift, uint32_t oprsz, uint32_t maxsz);
+void tcg_gen_gvec_rotrs(unsigned vece, uint32_t dofs, uint32_t aofs,
+                        TCGv_i32 shift, uint32_t oprsz, uint32_t maxsz);
 
 /*
  * Perform vector shift by vector element, modulo the element size.

diff --git a/tcg/tcg-op-gvec.c b/tcg/tcg-op-gvec.c
index 9c14908a46632f7afa53b177aa8d4b16c4f2510b..f51bcaa87b56fba33e12aa6466cbfe5d0d2c6083 100644 (file)
--- a/tcg/tcg-op-gvec.c
+++ b/tcg/tcg-op-gvec.c
@@ -3353,6 +3353,17 @@ void tcg_gen_gvec_rotls(unsigned vece, uint32_t dofs, uint32_t aofs,
     do_gvec_shifts(vece, dofs, aofs, shift, oprsz, maxsz, &g);
 }
 
+void tcg_gen_gvec_rotrs(unsigned vece, uint32_t dofs, uint32_t aofs,
+                        TCGv_i32 shift, uint32_t oprsz, uint32_t maxsz)
+{
+    TCGv_i32 tmp = tcg_temp_ebb_new_i32();
+
+    tcg_gen_neg_i32(tmp, shift);
+    tcg_gen_andi_i32(tmp, tmp, (8 << vece) - 1);
+    tcg_gen_gvec_rotls(vece, dofs, aofs, tmp, oprsz, maxsz);
+    tcg_temp_free_i32(tmp);
+}
+
 /*
  * Expand D = A << (B % element bits)
  *