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Re: ARM : code less efficient with gcc-trunk ?
- From: Daniel Jacobowitz <drow at false dot org>
- To: "Vincent R." <forumer at smartmobili dot com>
- Cc: gcc at gcc dot gnu dot org
- Date: Mon, 16 Feb 2009 10:17:36 -0500
- Subject: Re: ARM : code less efficient with gcc-trunk ?
- References: <9cab4102864768199e724598fff5bc08@mail.smartmobili.com>
On Mon, Feb 16, 2009 at 12:19:52PM +0100, Vincent R. wrote:
> 00011000 <WinMainCRTStartup>:
> 11000: e92d40f0 push {r4, r5, r6, r7, lr}
> 11004: e1a04000 mov r4, r0
> 11008: e1a05001 mov r5, r1
> 1100c: e1a06002 mov r6, r2
> 11010: e1a07003 mov r7, r3
> 00011000 <WinMainCRTStartup>:
> 11000: e92d4010 push {r4, lr}
> 11004: e1a04000 mov r4, r0
> 11008: e24dd00c sub sp, sp, #12 ; 0xc
> 1100c: e58d1008 str r1, [sp, #8]
> 11010: e58d2004 str r2, [sp, #4]
> 11014: e58d3000 str r3, [sp]
Notice how many more registers used to be pushed? I expect the new
code is faster.
> Maybe my remark is not relevant because I didn't try to do some benchmark
If you find any code that *runs* slower, please report it as a bug in
Bugzilla.
--
Daniel Jacobowitz
CodeSourcery