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158d72d728
Set the writable and dead_on_unwind attributes for sret arguments. These indicate that the argument points to writable memory (and it's legal to introduce spurious writes to it on entry to the function) and that the argument memory will not be used if the call unwinds. This enables additional MemCpyOpt/DSE/LICM optimizations.
31 lines
1.0 KiB
Objective-C
31 lines
1.0 KiB
Objective-C
// RUN: %clang_cc1 -fblocks -triple arm64-apple-darwin %s -emit-llvm -o - | FileCheck %s
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struct stret { int x[100]; };
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struct stret one = {{1}};
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@interface Test @end
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@implementation Test
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+(struct stret) method { return one; }
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@end
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int main(int argc, const char **argv)
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{
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struct stret s;
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s = [(id)(argc&~255) method];
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// CHECK: call void @objc_msgSend(ptr dead_on_unwind writable sret(%struct.stret) align 4 [[T0:%[^,]+]]
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// CHECK: call void @llvm.memset.p0.i64(ptr align 4 [[T0]], i8 0, i64 400, i1 false)
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s = [Test method];
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// CHECK: call void @objc_msgSend(ptr dead_on_unwind writable sret(%struct.stret) align 4 [[T1:%[^,]+]]
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// CHECK-NOT: call void @llvm.memset.p0.i64(
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[(id)(argc&~255) method];
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// CHECK: call void @objc_msgSend(ptr dead_on_unwind writable sret(%struct.stret) align 4 [[T1:%[^,]+]]
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// CHECK-NOT: call void @llvm.memset.p0.i64(
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[Test method];
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// CHECK: call void @objc_msgSend(ptr dead_on_unwind writable sret(%struct.stret) align 4 [[T1:%[^,]+]]
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// CHECK-NOT: call void @llvm.memset.p0.i64(
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}
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