Expand arithmetic right shift of bits-1 as a comparison vs 0.

Suggested-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
 tcg/i386/tcg-target.c.inc | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/tcg/i386/tcg-target.c.inc b/tcg/i386/tcg-target.c.inc
index 088c6c9264..4cd5d4276c 100644
--- a/tcg/i386/tcg-target.c.inc
+++ b/tcg/i386/tcg-target.c.inc
@@ -4357,6 +4357,12 @@ static void expand_vec_sari(TCGType type, unsigned vece,
 {
     TCGv_vec t1, t2;
 
+    if (imm >= (8 << vece) - 1) {
+        tcg_gen_cmp_vec(TCG_COND_LT, vece, v0, v1,
+                        tcg_constant_vec(type, MO_64, 0));
+        return;
+    }
+
     switch (vece) {
     case MO_8:
         /* Unpack to 16-bit, shift, and repack.  */
-- 
2.43.0