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Improve pass documentation and comments.

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Patch by Matthijs Kooijman!

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@50861 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Gordon Henriksen
2008-05-08 17:46:35 +00:00
parent 2539e33893
commit a8a118b68f
6 changed files with 136 additions and 102 deletions
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13
lib/Transforms/IPO/StructRetPromotion.cpp
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@ -1,4 +1,4 @@
//===-- StructRetPromotion.cpp - Promote sret arguments -000000------------===//
//===-- StructRetPromotion.cpp - Promote sret arguments ------------------===//
//
// The LLVM Compiler Infrastructure
//
@ -7,7 +7,16 @@
//
//===----------------------------------------------------------------------===//
//
// TODO : Describe this pass.
// This pass finds functions that return a struct (using a pointer to the struct
// as the first argument of the function, marked with the 'sret' attribute) and
// replaces them with a new function that simply returns each of the elements of
// that struct (using multiple return values).
//
// This pass works under a number of conditions:
// 1. The returned struct must not contain other structs
// 2. The returned struct must only be used to load values from
// 3. The placeholder struct passed in is the result of an alloca
//
//===----------------------------------------------------------------------===//
#define DEBUG_TYPE "sretpromotion"