* [Qemu-devel] [6831] tcg: optimize tcg_gen_bswap16_i32
@ 2009-03-13 9:35 Aurelien Jarno
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From: Aurelien Jarno @ 2009-03-13 9:35 UTC (permalink / raw)
To: qemu-devel
Revision: 6831
http://svn.sv.gnu.org/viewvc/?view=rev&root=qemu&revision=6831
Author: aurel32
Date: 2009-03-13 09:35:03 +0000 (Fri, 13 Mar 2009)
Log Message:
-----------
tcg: optimize tcg_gen_bswap16_i32
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
Modified Paths:
--------------
trunk/tcg/tcg-op.h
Modified: trunk/tcg/tcg-op.h
===================================================================
--- trunk/tcg/tcg-op.h 2009-03-13 09:34:56 UTC (rev 6830)
+++ trunk/tcg/tcg-op.h 2009-03-13 09:35:03 UTC (rev 6831)
@@ -1207,16 +1207,13 @@
#ifdef TCG_TARGET_HAS_bswap16_i32
tcg_gen_op2_i32(INDEX_op_bswap16_i32, ret, arg);
#else
- TCGv_i32 t0, t1;
- t0 = tcg_temp_new_i32();
- t1 = tcg_temp_new_i32();
+ TCGv_i32 t0 = tcg_temp_new_i32();
- tcg_gen_shri_i32(t0, arg, 8);
- tcg_gen_andi_i32(t1, arg, 0x000000ff);
- tcg_gen_shli_i32(t1, t1, 8);
- tcg_gen_or_i32(ret, t0, t1);
+ tcg_gen_ext8u_i32(t0, arg);
+ tcg_gen_shli_i32(t0, t0, 8);
+ tcg_gen_shri_i32(ret, arg, 8);
+ tcg_gen_or_i32(ret, ret, t0);
tcg_temp_free_i32(t0);
- tcg_temp_free_i32(t1);
#endif
}
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