2ff012df81
If a class inherits from NSObject and has an implementation, then we can assume that ivar offsets won't need to be updated by the runtime. This allows us to index into the object using a constant value and avoid loading from the ivar offset variable. This patch was adapted from one written by Pete Cooper. rdar://problem/10132568 Differential revision: https://reviews.llvm.org/D56802 llvm-svn: 351461
65 lines
1.8 KiB
Objective-C
65 lines
1.8 KiB
Objective-C
// RUN: %clang_cc1 -triple x86_64-apple-darwin10 -O0 -emit-llvm %s -o - | FileCheck %s
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// rdar://16095748
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@interface MyNSObject
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@end
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@interface SampleClass : MyNSObject {
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@public
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int _value;
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}
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+ (SampleClass*) new;
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@end
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@interface AppDelegate : MyNSObject
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@end
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extern void foo(int);
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@implementation AppDelegate
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- (void)application
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{
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// Create set of objects in loop
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for(int i = 0; i < 2; i++) {
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SampleClass *sample = [SampleClass new];
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foo (sample->_value);
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}
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}
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@end
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// CHECK: [[IVAR:%.*]] = load i64, i64* @"OBJC_IVAR_$_SampleClass._value", align 8
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// CHECK: [[THREE:%.*]] = bitcast [[ONE:%.*]]* [[CALL:%.*]] to i8*
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// CHECK: [[ADDPTR:%.*]] = getelementptr inbounds i8, i8* [[THREE]], i64 [[IVAR]]
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// CHECK: [[FOUR:%.*]] = bitcast i8* [[ADDPTR]] to i32*
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// CHECK: [[FIVE:%.*]] = load i32, i32* [[FOUR]], align 4
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// CHECK: call void @foo(i32 [[FIVE]])
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@implementation SampleClass
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+ (SampleClass*) new { return 0; }
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- (void) SampleClassApplication
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{
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// Create set of objects in loop
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for(int i = 0; i < 2; i++) {
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SampleClass *sample = [SampleClass new];
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foo (sample->_value);
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}
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}
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@end
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// CHECK: [[ZERO:%.*]] = load i8*, i8** @OBJC_SELECTOR_REFERENCES_, align 8, !invariant.load
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// CHECK: [[IVAR:%.*]] = load i64, i64* @"OBJC_IVAR_$_SampleClass._value", align 8, !invariant.load
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@interface Sample : SampleClass @end
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@implementation Sample
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- (void) SampleApplication
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{
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// Create set of objects in loop
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for(int i = 0; i < 2; i++) {
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SampleClass *sample = [SampleClass new];
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foo (sample->_value);
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}
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}
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@end
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// CHECK: [[ZERO:%.*]] = load i8*, i8** @OBJC_SELECTOR_REFERENCES_, align 8, !invariant.load
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// CHECK: [[IVAR:%.*]] = load i64, i64* @"OBJC_IVAR_$_SampleClass._value", align 8, !invariant.load
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