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Add the C99 hex-float assembly syntax to our extension document.

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As Ben pointed out, GAS doesn't support this syntax so we should give at least
some warning that it might not be portable.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@188377 91177308-0d34-0410-b5e6-96231b3b80d8
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Tim Northover 2013-08-14 15:27:20 +00:00
parent 47e7c040f4
commit 003f93f134
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docs/Extensions.rst
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@ -14,6 +14,19 @@ Introduction
This document describes extensions to tools and formats LLVM seeks compatibility
with.
General Assembly Syntax
===========================
C99-style Hexadecimal Floating-point Constants
----------------------------------------------
LLVM's assemblers allow floating-point constants to be written in C99's
hexadecimal format instead of decimal if desired.
.. code-block:: gas
.section .data
.float 0x1c2.2ap3
Machine-specific Assembly Syntax
================================