mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2024-10-19 02:52:53 +02:00
4e2d8dca99
`allocsize` is a function attribute that allows users to request that LLVM treat arbitrary functions as allocation functions. This patch makes LLVM accept the `allocsize` attribute, and makes `@llvm.objectsize` recognize said attribute. The review for this was split into two patches for ease of reviewing: D18974 and D14933. As promised on the revisions, I'm landing both patches as a single commit. Differential Revision: http://reviews.llvm.org/D14933 llvm-svn: 266032
30 lines
932 B
LLVM
30 lines
932 B
LLVM
; RUN: opt < %s -instcombine -S | FileCheck %s
|
|
;
|
|
; The idea is that we want to have sane semantics (e.g. not assertion failures)
|
|
; when given an allocsize function that takes a 64-bit argument in the face of
|
|
; 32-bit pointers.
|
|
|
|
target datalayout="e-p:32:32:32"
|
|
|
|
declare i8* @my_malloc(i8*, i64) allocsize(1)
|
|
|
|
define void @test_malloc(i8** %p, i32* %r) {
|
|
%1 = call i8* @my_malloc(i8* null, i64 100)
|
|
store i8* %1, i8** %p, align 8 ; To ensure objectsize isn't killed
|
|
|
|
%2 = call i32 @llvm.objectsize.i32.p0i8(i8* %1, i1 false)
|
|
; CHECK: store i32 100
|
|
store i32 %2, i32* %r, align 8
|
|
|
|
; Big number is 5 billion.
|
|
%3 = call i8* @my_malloc(i8* null, i64 5000000000)
|
|
store i8* %3, i8** %p, align 8 ; To ensure objectsize isn't killed
|
|
|
|
; CHECK: call i32 @llvm.objectsize
|
|
%4 = call i32 @llvm.objectsize.i32.p0i8(i8* %3, i1 false)
|
|
store i32 %4, i32* %r, align 8
|
|
ret void
|
|
}
|
|
|
|
declare i32 @llvm.objectsize.i32.p0i8(i8*, i1)
|