diff mbox series

[02/28] tcg/i386: Support bswap flags

Message ID 20210614083800.1166166-3-richard.henderson@linaro.org (mailing list archive)
State New, archived
Headers show
Series tcg: bswap improvements | expand

Commit Message

Richard Henderson June 14, 2021, 8:37 a.m. UTC 
Retain the current rorw bswap16 expansion for the zero-in/zero-out case.
Otherwise, perform a wider bswap plus a right-shift or extend.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
 tcg/i386/tcg-target.c.inc | 20 +++++++++++++++++++-
 1 file changed, 19 insertions(+), 1 deletion(-)

Comments

Peter Maydell June 21, 2021, 1:53 p.m. UTC | #1 
On Mon, 14 Jun 2021 at 09:46, Richard Henderson
<richard.henderson@linaro.org> wrote:
>
> Retain the current rorw bswap16 expansion for the zero-in/zero-out case.
> Otherwise, perform a wider bswap plus a right-shift or extend.
>
> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>

thanks
-- PMM
diff mbox series

Patch

diff --git a/tcg/i386/tcg-target.c.inc b/tcg/i386/tcg-target.c.inc
index 34113388ef..98d924b91a 100644
--- a/tcg/i386/tcg-target.c.inc
+++ b/tcg/i386/tcg-target.c.inc
@@ -2421,10 +2421,28 @@  static inline void tcg_out_op(TCGContext *s, TCGOpcode opc,
         break;
 
     OP_32_64(bswap16):
-        tcg_out_rolw_8(s, a0);
+        if (a2 & TCG_BSWAP_OS) {
+            /* Output must be sign-extended. */
+            if (rexw) {
+                tcg_out_bswap64(s, a0);
+                tcg_out_shifti(s, SHIFT_SAR + rexw, a0, 48);
+            } else {
+                tcg_out_bswap32(s, a0);
+                tcg_out_shifti(s, SHIFT_SAR, a0, 16);
+            }
+        } else if ((a2 & (TCG_BSWAP_IZ | TCG_BSWAP_OZ)) == TCG_BSWAP_OZ) {
+            /* Output must be zero-extended, but input isn't. */
+            tcg_out_bswap32(s, a0);
+            tcg_out_shifti(s, SHIFT_SHR, a0, 16);
+        } else {
+            tcg_out_rolw_8(s, a0);
+        }
         break;
     OP_32_64(bswap32):
         tcg_out_bswap32(s, a0);
+        if (rexw && (a2 & TCG_BSWAP_OS)) {
+            tcg_out_ext32s(s, a0, a0);
+        }
         break;
 
     OP_32_64(neg):