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Re: GCSE considers read only memory clobbered by function calls.

From: Paolo Bonzini <bonzini at gnu dot org>
To: gcc at gcc dot gnu dot org
Date: Mon, 09 May 2005 17:09:10 +0200
Subject: Re: GCSE considers read only memory clobbered by function calls.
References: <OFBAA786E9.115D4B94-ON43256FFC.0047BCC1-43256FFC.00510FD2@il.ibm.com>

It appears that GCSE considers "read only memory" as call clobbered, which
is not the case in CSE. I have took the test for read-only memory from CSE
and add it to GCSE where we compute the transparency.

My wild guess is that this was not possible when MEM_READONLY_P was RTX_UNCHANGING_P, and now it is.

Paolo

Follow-Ups:
- Re: GCSE considers read only memory clobbered by function calls.
  - From: Mostafa Hagog

References:
- GCSE considers read only memory clobbered by function calls.
  - From: Mostafa Hagog

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