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Re: optimization/10592: [arm] caller-save incorrectly handles a reloaded SET_DEST operand

From: Richard Earnshaw <rearnsha at arm dot com>
To: gcc-bugs at gcc dot gnu dot org, gcc-gnats at gcc dot gnu dot org, nobody at gcc dot gnu dot org, ryan dot pipkin at inet dot com, law at redhat dot com
Cc: Richard dot Earnshaw at arm dot com
Date: Fri, 02 May 2003 15:02:10 +0100
Subject: Re: optimization/10592: [arm] caller-save incorrectly handles a reloaded SET_DEST operand
Organization: ARM Ltd.
Reply-to: Richard dot Earnshaw at arm dot com

This patch implements the idea I just suggested, it does indeed seem to 
solve the problem:

With the patch, the relevant bit of the code is now:

        str     ip, [fp, #-44]
        bl      strncpy
        ldr     ip, [fp, #-44]
        add     r2, r9, #156
        add     lr, r9, #16
        str     r2, [ip, #540]


I'll do a full testsuite run to check for regressions.

<date>  Richard Earnshaw  <rearnsha@arm.com>

	* caller-save.c (mark_referenced_regs): Don't short-circuit a reg
	or subreg in SET_DEST if it isn't a hard register.

R.

Attachment: caller-save.patch
Description: caller-save.patch

References:
- Re: optimization/10592: [arm] caller-save incorrectly handles a reloaded SET_DEST operand
  - From: Richard Earnshaw

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