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RE: [PATCH GCC/pr56124] Don't prefer memory if the source of load operation has side effect



> -----Original Message-----
> From: gcc-patches-owner@gcc.gnu.org [mailto:gcc-patches-owner@gcc.gnu.org]
On
> Behalf Of Bin Cheng
> Sent: Monday, March 25, 2013 3:15 PM
> To: gcc-patches@gcc.gnu.org
> Subject: FW: [PATCH GCC/pr56124] Don't prefer memory if the source of load
> operation has side effect
> 
> Sorry for the wrong list.
> 
> -----Original Message-----
> From: Bin Cheng [mailto:bin.cheng@arm.com]
> Sent: Monday, March 25, 2013 3:00 PM
> To: gcc@gcc.gnu.org
> Subject: [PATCH GCC/pr56124] Don't prefer memory if the source of load
> operation has side effect
> 
> Hi,
> As reported in PR56124, IRA causes redundant reload by preferring to put
> pseudo which is target of loading in memory. Generally this is good but
the
> case in which the src of loading has side effect.
> This patch fixes this issue by checking whether source of loading has side
> effect.
> 
> I tested the patch on x86/thumb2. Is it OK? Thanks.
> 
> 2013-03-25  Bin Cheng  <bin.cheng@arm.com>
> 
> 	PR target/56124
> 	* ira-costs.c (scan_one_insn): Check whether the source rtx of
> 	loading has side effect.

Ping.





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