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Re: PING: PATCH [4/n]: Prepare x32: Permute the conversion and addition if one operand is a constant
- From: Paolo Bonzini <bonzini at gnu dot org>
- To: pinskia at gmail dot com, "H.J. Lu" <hjl dot tools at gmail dot com>
- Cc: GCC Patches <gcc-patches at gcc dot gnu dot org>
- Date: Fri, 30 May 2014 09:18:31 +0200
- Subject: Re: PING: PATCH [4/n]: Prepare x32: Permute the conversion and addition if one operand is a constant
- Authentication-results: sourceware.org; auth=none
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Il 29/05/2014 19:20, pinskia@gmail.com ha scritto:
What is your Pmode?
Pmode is dimode while ptr_mode is simode. Pointers are zero extended when converting between si and di modes.
As you noted, the fundamental difference between x32 and aarch64 is that
aarch64 will still use 64-bit accesses instead of 32-bit. Did you
define the VALID_POINTER_MODE hook to rule out Pmode as a valid pointer
mode? Perhaps you can use it to make this transformation conditional on
VALID_POINTER_MODE(Pmode).
Paolo