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[Bug 1001607] Cortex-M4F architectural Floating Point Support
- From: bugzilla-daemon at bugs dot ecos dot sourceware dot org
- To: ecos-patches at ecos dot sourceware dot org
- Date: Wed, 29 Aug 2012 20:34:39 +0100
- Subject: [Bug 1001607] Cortex-M4F architectural Floating Point Support
- Auto-submitted: auto-generated
- References: <bug-1001607-104@http.bugs.ecos.sourceware.org/>
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Ilija Kocho <ilijak@siva.com.mk> changed:
What |Removed |Added
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Attachment #1816|0 |1
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Attachment #1893|0 |1
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--- Comment #27 from Ilija Kocho <ilijak@siva.com.mk> 2012-08-29 20:34:27 BST ---
Created an attachment (id=1915)
--> (http://bugs.ecos.sourceware.org/attachment.cgi?id=1915)
Cortex-M4F Floating Point Support 120829
Hi Jifl and others.
Here is the integral patch for Cortex-M4F architectural floating point support.
I have passed through the code several times, cleaned up, fixed formatting and
typos...
There's however one essential addition: option for softfp ABI. Being able to
link softfp code with -mfloat-abi=soft, the -mfloat-abi=softfp flag (when
selected) is applied only to context.S and vectors.S. All other code compiles
with -mfloat-abi=soft thus avoiding potential GCC's "optimizations" - see Note
below.
Note (RFC): according to
http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.dai0298a/DAFIFGGE.html
if hardware floating point option is selected, GCC may choose to use FPU
registers even if there isn't floating point source. Please comment.
Having this said I have set following defaults:
- Hardware floating point is disabled by default.
- When hardware floating point is enabled the default ABI is:
- softfp for LAZY and NONE
- hard for ALL.
Ilija
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