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llvm-project/llvm/test/Transforms/FunctionAttrs/2009-01-02-LocalStores.ll

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Extend 'readonly' and 'readnone' to work on function arguments as well as functions. Make the function attributes pass add it to known library functions and when it can deduce it. llvm-svn: 185735
2013-07-06 08:29:58 +08:00
; RUN: opt < %s -functionattrs -S | FileCheck %s
When calculating 'nocapture' argument attributes, allow the argument to be stored to an alloca by tracking uses of the alloca. This occurs 4 times (out of 7121, 0.05%) in MultiSource/Applications, so may not be worth it. On the other hand, it is easy to do and fairly cheap. The functions it helps are: W_addcom and W_addlit in spiff; process_args (argv) in d (make_dparser); ercPixConcealIMB in JM/ldecod. llvm-svn: 61570
2009-01-02 19:54:37 +08:00
Extend 'readonly' and 'readnone' to work on function arguments as well as functions. Make the function attributes pass add it to known library functions and when it can deduce it. llvm-svn: 185735
2013-07-06 08:29:58 +08:00
; CHECK: define i32* @a(i32** nocapture readonly %p)
Remove alloca tracking from nocapture analysis. Not only was it not very helpful, it was also wrong! The problem is shown in the testcase: the alloca might be passed to a nocapture callee which dereferences it and returns the original pointer. But because it was a nocapture call we think we don't need to track its uses, but we do. llvm-svn: 61876
2009-01-08 03:39:06 +08:00
define i32* @a(i32** %p) {
[opaque pointer type] Add textual IR support for explicit type parameter to load instruction Essentially the same as the GEP change in r230786. A similar migration script can be used to update test cases, though a few more test case improvements/changes were required this time around: (r229269-r229278) import fileinput import sys import re pat = re.compile(r"((?:=|:|^)\s*load (?:atomic )?(?:volatile )?(.*?))(| addrspace\(\d+\) *)\*($| *(?:%|@|null|undef|blockaddress|getelementptr|addrspacecast|bitcast|inttoptr|\[\[[a-zA-Z]|\{\{).*$)") for line in sys.stdin: sys.stdout.write(re.sub(pat, r"\1, \2\3*\4", line)) Reviewers: rafael, dexonsmith, grosser Differential Revision: http://reviews.llvm.org/D7649 llvm-svn: 230794
2015-02-28 05:17:42 +08:00
%tmp = load i32*, i32** %p
Remove alloca tracking from nocapture analysis. Not only was it not very helpful, it was also wrong! The problem is shown in the testcase: the alloca might be passed to a nocapture callee which dereferences it and returns the original pointer. But because it was a nocapture call we think we don't need to track its uses, but we do. llvm-svn: 61876
2009-01-08 03:39:06 +08:00
ret i32* %tmp
}
When calculating 'nocapture' argument attributes, allow the argument to be stored to an alloca by tracking uses of the alloca. This occurs 4 times (out of 7121, 0.05%) in MultiSource/Applications, so may not be worth it. On the other hand, it is easy to do and fairly cheap. The functions it helps are: W_addcom and W_addlit in spiff; process_args (argv) in d (make_dparser); ercPixConcealIMB in JM/ldecod. llvm-svn: 61570
2009-01-02 19:54:37 +08:00
Extend 'readonly' and 'readnone' to work on function arguments as well as functions. Make the function attributes pass add it to known library functions and when it can deduce it. llvm-svn: 185735
2013-07-06 08:29:58 +08:00
; CHECK: define i32* @b(i32* %q)
Remove alloca tracking from nocapture analysis. Not only was it not very helpful, it was also wrong! The problem is shown in the testcase: the alloca might be passed to a nocapture callee which dereferences it and returns the original pointer. But because it was a nocapture call we think we don't need to track its uses, but we do. llvm-svn: 61876
2009-01-08 03:39:06 +08:00
define i32* @b(i32 *%q) {
%mem = alloca i32*
store i32* %q, i32** %mem
%tmp = call i32* @a(i32** %mem)
ret i32* %tmp
When calculating 'nocapture' argument attributes, allow the argument to be stored to an alloca by tracking uses of the alloca. This occurs 4 times (out of 7121, 0.05%) in MultiSource/Applications, so may not be worth it. On the other hand, it is easy to do and fairly cheap. The functions it helps are: W_addcom and W_addlit in spiff; process_args (argv) in d (make_dparser); ercPixConcealIMB in JM/ldecod. llvm-svn: 61570
2009-01-02 19:54:37 +08:00
}
Extend 'readonly' and 'readnone' to work on function arguments as well as functions. Make the function attributes pass add it to known library functions and when it can deduce it. llvm-svn: 185735
2013-07-06 08:29:58 +08:00
; CHECK: define i32* @c(i32* readnone %r)
@g = global i32 0
define i32* @c(i32 *%r) {
%a = icmp eq i32* %r, null
store i32 1, i32* @g
ret i32* %r
}