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Peter Collingbourne 1285efe0c1 ArgumentPromotion: Drop sret attribute on functions that are only called directly.

If the first argument to a function is a 'this' argument and the second
has the sret attribute, the ArgumentPromotion pass may promote the 'this'
argument to more than one argument, violating the IR constraint that 'sret'
may only be applied to the first or second argument.

Although this IR constraint is arguably unnecessary, it highlighted the fact
that ArgPromotion does not need to preserve this attribute. Dropping the
attribute reduces register pressure in the backend by avoiding the register
copy required by sret. Because sret implies noalias, we also replace the
former with the latter.

Differential Revision: http://reviews.llvm.org/D10353

llvm-svn: 239488

2015-06-10 21:14:34 +00:00

Hello

…

InstCombine

[InstCombine, InstSimplify] Move xforms from Combine to Simplify

2015-06-06 22:40:21 +00:00

Instrumentation

[asan] Prevent __attribute__((annotate)) triggering errors on Darwin

2015-06-09 00:58:08 +00:00

IPO

ArgumentPromotion: Drop sret attribute on functions that are only called directly.

2015-06-10 21:14:34 +00:00