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Clarify the unwind attribute. Add assumption
about sret made by the optimizers. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@48452 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -829,6 +829,7 @@ declare i32 @atoi(i8*) nounwind readonly
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<dt><tt>sret</tt></dt>
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<dd>This indicates that the pointer parameter specifies the address of a
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structure that is the return value of the function in the source program.
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Loads and stores to the structure are assumed not to trap.
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May only be applied to the first parameter.</dd>
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<dt><tt>noalias</tt></dt>
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@ -842,10 +843,11 @@ declare i32 @atoi(i8*) nounwind readonly
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an <tt>unreachable</tt> instruction immediately followed the call.</dd>
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<dt><tt>nounwind</tt></dt>
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<dd>This function attribute indicates that the function type does not use
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the unwind instruction and does not allow stack unwinding to propagate
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through it.</dd>
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<dd>This function attribute indicates that no exceptions unwind out of the
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function. Usually this is because the function makes no use of exceptions,
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but it may also be that the function catches any exceptions thrown when
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executing it.</dd>
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<dt><tt>nest</tt></dt>
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<dd>This indicates that the parameter can be excised using the
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<a href="#int_trampoline">trampoline intrinsics</a>.</dd>
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