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Added support in FunctionAttrs for adding relevant function/argument attributes for the posix call gettimeofday.

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This implies annotating it as nounwind and its arguments as nocapture. To be
conservative, we do not annotate the arguments with noalias since some platforms
do not have restrict on the declaration for gettimeofday.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@185502 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Michael Gottesman 2013-07-03 04:00:54 +00:00
parent f0f85eab04
commit 7cb0321ad8
2 changed files with 13 additions and 0 deletions
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10
lib/Transforms/IPO/FunctionAttrs.cpp
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@ -1310,6 +1310,16 @@ bool FunctionAttrs::inferPrototypeAttributes(Function &F) {
// May throw; "open" is a valid pthread cancellation point.
setDoesNotCapture(F, 1);
break;
case LibFunc::gettimeofday:
if (FTy->getNumParams() != 2 || !FTy->getParamType(0)->isPointerTy() ||
!FTy->getParamType(1)->isPointerTy())
return false;
// Currently some platforms have the restrict keyword on the arguments to
// gettimeofday. To be conservative, do not add noalias to gettimeofday's
// arguments.
setDoesNotThrow(F);
setDoesNotCapture(F, 1);
setDoesNotCapture(F, 2);
default:
// Didn't mark any attributes.
return false;

3
test/Transforms/FunctionAttrs/annotate-1.ll
View File

@ -14,5 +14,8 @@ declare i32* @realloc(i32*, i32)
declare i32 @strcpy(...)
; CHECK: declare i32 @strcpy(...)
declare i32 @gettimeofday(i8*, i8*)
; CHECK: declare i32 @gettimeofday(i8* nocapture, i8* nocapture) [[G0]]
; CHECK: attributes [[G0]] = { nounwind }
; CHECK: attributes [[G1]] = { nounwind readonly }