[PATCH] D28820: Warn when calling a non interrupt function from an interrupt on ARM
Jonathan Roelofs via Phabricator via cfe-commits
cfe-commits at lists.llvm.org
Wed Jan 18 11:51:28 PST 2017
jroelofs added a comment.
In https://reviews.llvm.org/D28820#649726, @efriedma wrote:
> Why can't the compiler handle this case itself transparently? According to your description, the interrupt calling convention is different from the normal hard-float AAPCS calling convention: the VFP registers are all callee-save. The compiler knows this; it should be able to insert the appropriate spills itself.
There would be a big performance penalty for ISRs with callees that don't use VFP regs.
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