[Qemu-devel] [PATCH 1/8] coccinelle: add a script to optimize tcg op using tcg_gen_extract()

["Philippe Mathieu-Daudé" <f4bug@amsat.org>]

Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
---
 scripts/coccinelle/tcg_gen_extract.cocci | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)
 create mode 100644 scripts/coccinelle/tcg_gen_extract.cocci

diff --git a/scripts/coccinelle/tcg_gen_extract.cocci b/scripts/coccinelle/tcg_gen_extract.cocci
new file mode 100644
index 0000000000..4080f97cc7
--- /dev/null
+++ b/scripts/coccinelle/tcg_gen_extract.cocci
@@ -0,0 +1,26 @@
+// optimize TCG using extract op
+//
+// Copyright: (C) 2017 Philippe Mathieu-Daudé. GPLv2.
+// Confidence: High
+// Options: --macro-file scripts/cocci-macro-file.h
+@@
+identifier ret, arg;
+constant ofs, len;
+@@
+(
+// from Nikunj A Dadhania comment:
+// http://lists.nongnu.org/archive/html/qemu-devel/2017-02/msg05211.html
+-tcg_gen_shri_tl(ret, arg, ofs);
+-tcg_gen_andi_tl(ret, ret, len);
++tcg_gen_extract_tl(ret, arg, ofs, len);
+|
+// from Aurelien Jarno comment:
+// http://lists.nongnu.org/archive/html/qemu-devel/2017-05/msg01466.html
+-tcg_gen_shri_i32(ret, arg, ofs);
+-tcg_gen_andi_i32(ret, ret, len);
++tcg_gen_extract_i32(ret, arg, ofs, len);
+|
+-tcg_gen_shri_i64(ret, arg, ofs);
+-tcg_gen_andi_i64(ret, ret, len);
++tcg_gen_extract_i64(ret, arg, ofs, len);
+)
-- 
2.11.0