commit 26c41cc4a3d998caa700407a27e18755a6e1895c
author Richard Henderson <richard.henderson@linaro.org> Wed Aug 27 20:33:27 2025 +1000
committer Richard Henderson <richard.henderson@linaro.org> Thu Sep 04 09:49:23 2025 +0200
tree 1a3732110bdfd83536acfb41f554ab1c56cf86b3
parent b8eb3dd49583729edceb18628e626eac15a15de4

tcg/i386: Expand sari of bits-1 as pcmpgt

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

diff --git a/tcg/i386/tcg-target.c.inc b/tcg/i386/tcg-target.c.inc
index 088c6c9..4cd5d42 100644
--- a/tcg/i386/tcg-target.c.inc
+++ b/tcg/i386/tcg-target.c.inc
@@ -4357,6 +4357,12 @@
 {
     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.  */