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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.
28 lines
1015 B
Objective-C
28 lines
1015 B
Objective-C
// RUN: %clang_cc1 -DSTRET -triple x86_64-pc-linux-gnu -fobjc-runtime=objfw -emit-llvm -o - %s | FileCheck -check-prefix=HASSTRET %s
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// RUN: %clang_cc1 -triple x86_64-pc-linux-gnu -fobjc-runtime=gcc -emit-llvm -o - %s | FileCheck -check-prefix=NOSTRET %s
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// Test stret lookup
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struct test {
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char test[1024];
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};
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@interface Test0
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+ (struct test)test;
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@end
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void test0(void) {
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struct test t;
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#if (defined(STRET) && defined(__OBJFW_RUNTIME_ABI__)) || \
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(!defined(STRET) && !defined(__OBJFW_RUNTIME_ABI__))
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t = [Test0 test];
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#endif
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(void)t;
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}
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// HASSTRET-LABEL: define{{.*}} void @test0()
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// HASSTRET: [[T0:%.*]] = call ptr @objc_msg_lookup_stret(ptr @_OBJC_CLASS_Test0,
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// HASSTRET-NEXT: call void [[T0]](ptr dead_on_unwind writable sret(%struct.test) {{.*}}, ptr noundef @_OBJC_CLASS_Test0,
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// NOSTRET-LABEL: define{{.*}} void @test0()
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// NOSTRET: [[T0:%.*]] = call ptr @objc_msg_lookup(ptr
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// NOSTRET-NEXT: call void [[T0]](ptr dead_on_unwind writable sret(%struct.test) {{.*}}, ptr {{.*}}, ptr noundef
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