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Re: [PATCH] - Use of powerpc 64bit instructions in 32bit ABI

From: Fariborz Jahanian <fjahanian at apple dot com>
To: Richard Henderson <rth at redhat dot com>
Cc: Fariborz Jahanian <fjahanian at apple dot com>, gcc-patches at gcc dot gnu dot org
Date: Tue, 14 Oct 2003 15:50:12 -0700
Subject: Re: [PATCH] - Use of powerpc 64bit instructions in 32bit ABI

On Tuesday, October 14, 2003, at 03:16 PM, Richard Henderson wrote:

On Tue, Oct 14, 2003 at 02:36:25PM -0700, Fariborz Jahanian wrote:

        (load_register_parameters): use of UNITS_PER_REGISTER_ARGUMENT
macro.

This is definitely wrong.

In 64-bit mode UNITS_PER_WORD is 64.  In 32-bit mode it's 32.
That you are trying to replace this value with something else
means there's a very fundamental misunderstanding somewhere.

r~

This patch is about a new mixed compilation mode where register sizes are 64bit and are used in 64bit instructions. In this mode, UNITS_PER_WORD is 64. However, when it comes to the abi-specific areas such as, passing arguments, returning function values, etc. Only 32bit half of the register is used. For abi-specific areas of compiler, use of UNITS_PER_WORD is replaced with UNITS_PER_REGISTER_ARGUMENT which is usually identical to UNITS_PER_WORD, except in this mixed mode (it is 32).

- fj

Follow-Ups:
- Re: [PATCH] - Use of powerpc 64bit instructions in 32bit ABI
  - From: David S. Miller
- Re: [PATCH] - Use of powerpc 64bit instructions in 32bit ABI
  - From: Richard Henderson

References:
- Re: [PATCH] - Use of powerpc 64bit instructions in 32bit ABI
  - From: Richard Henderson

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