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Bug in x86-64 psABI or in gcc?
- From: "H.J. Lu" <hjl dot tools at gmail dot com>
- To: discuss at x86-64 dot org, GCC Development <gcc at gcc dot gnu dot org>, "Girkar, Milind" <milind dot girkar at intel dot com>, "Kreitzer, David L" <david dot l dot kreitzer at intel dot com>, "H. Peter Anvin" <hpa at zytor dot com>
- Date: Mon, 7 Dec 2009 10:33:38 -0800
- Subject: Bug in x86-64 psABI or in gcc?
Hi,
x86-64 psABI says _Bool has 1 byte and aligned at 1 byte. It also says:
---
When a value of type _Bool is passed in a register or on the stack,
the upper 63 bits of the eightbyte shall be zero.
---
However, gcc treats _Bool as char:
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42324
Given that gcc never zeros the upper 63 bits in register nor
on stack, should we update x86-64 psABI to reflect what gcc
really does?
Thanks.
--
H.J.