inalloca-overaligned.cpp
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// RUN: %clang_cc1 -fms-extensions -w -triple i386-pc-win32 -emit-llvm -o - %s | FileCheck %s
// PR44395
// MSVC passes overaligned types indirectly since MSVC 2015. Make sure that
// works with inalloca.
struct NonTrivial {
NonTrivial();
NonTrivial(const NonTrivial &o);
int x;
};
struct __declspec(align(64)) OverAligned {
OverAligned();
int buf[16];
};
struct __declspec(align(8)) Both {
Both();
Both(const Both &o);
int x, y;
};
extern int gvi32;
int receive_inalloca_overaligned(NonTrivial nt, OverAligned o) {
return nt.x + o.buf[0];
}
// CHECK-LABEL: define dso_local i32 @"?receive_inalloca_overaligned@@Y{{.*}}"
// CHECK-SAME: (<{ %struct.NonTrivial, %struct.OverAligned* }>* inalloca %0)
int pass_inalloca_overaligned() {
gvi32 = receive_inalloca_overaligned(NonTrivial(), OverAligned());
return gvi32;
}
// CHECK-LABEL: define dso_local i32 @"?pass_inalloca_overaligned@@Y{{.*}}"
// CHECK: [[TMP:%[^ ]*]] = alloca %struct.OverAligned, align 64
// CHECK: call i8* @llvm.stacksave()
// CHECK: alloca inalloca <{ %struct.NonTrivial, %struct.OverAligned* }>
// Construct OverAligned into TMP.
// CHECK: call x86_thiscallcc %struct.OverAligned* @"??0OverAligned@@QAE@XZ"(%struct.OverAligned* [[TMP]])
// Construct NonTrivial into the GEP.
// CHECK: [[GEP:%[^ ]*]] = getelementptr inbounds <{ %struct.NonTrivial, %struct.OverAligned* }>, <{ %struct.NonTrivial, %struct.OverAligned* }>* %{{.*}}, i32 0, i32 0
// CHECK: call x86_thiscallcc %struct.NonTrivial* @"??0NonTrivial@@QAE@XZ"(%struct.NonTrivial* [[GEP]])
// Store the address of an OverAligned temporary into the struct.
// CHECK: getelementptr inbounds <{ %struct.NonTrivial, %struct.OverAligned* }>, <{ %struct.NonTrivial, %struct.OverAligned* }>* %{{.*}}, i32 0, i32 1
// CHECK: store %struct.OverAligned* [[TMP]], %struct.OverAligned** %{{.*}}, align 4
// CHECK: call i32 @"?receive_inalloca_overaligned@@Y{{.*}}"(<{ %struct.NonTrivial, %struct.OverAligned* }>* inalloca %argmem)
int receive_both(Both o) {
return o.x + o.y;
}
// CHECK-LABEL: define dso_local i32 @"?receive_both@@Y{{.*}}"
// CHECK-SAME: (%struct.Both* %o)
int pass_both() {
gvi32 = receive_both(Both());
return gvi32;
}
// CHECK-LABEL: define dso_local i32 @"?pass_both@@Y{{.*}}"
// CHECK: [[TMP:%[^ ]*]] = alloca %struct.Both, align 8
// CHECK: call x86_thiscallcc %struct.Both* @"??0Both@@QAE@XZ"(%struct.Both* [[TMP]])
// CHECK: call i32 @"?receive_both@@Y{{.*}}"(%struct.Both* [[TMP]])
int receive_inalloca_both(NonTrivial nt, Both o) {
return nt.x + o.x + o.y;
}
// CHECK-LABEL: define dso_local i32 @"?receive_inalloca_both@@Y{{.*}}"
// CHECK-SAME: (<{ %struct.NonTrivial, %struct.Both* }>* inalloca %0)
int pass_inalloca_both() {
gvi32 = receive_inalloca_both(NonTrivial(), Both());
return gvi32;
}
// CHECK-LABEL: define dso_local i32 @"?pass_inalloca_both@@Y{{.*}}"
// CHECK: [[TMP:%[^ ]*]] = alloca %struct.Both, align 8
// CHECK: call x86_thiscallcc %struct.Both* @"??0Both@@QAE@XZ"(%struct.Both* [[TMP]])
// CHECK: call i32 @"?receive_inalloca_both@@Y{{.*}}"(<{ %struct.NonTrivial, %struct.Both* }>* inalloca %argmem)
// Here we have a type that is:
// - overaligned
// - not trivially copyable
// - can be "passed in registers" due to [[trivial_abi]]
// Clang should pass it directly.
struct [[trivial_abi]] alignas(8) MyPtr {
MyPtr();
MyPtr(const MyPtr &o);
~MyPtr();
int *ptr;
};
int receiveMyPtr(MyPtr o) { return *o.ptr; }
// CHECK-LABEL: define dso_local i32 @"?receiveMyPtr@@Y{{.*}}"
// CHECK-SAME: (%struct.MyPtr* %o)
int passMyPtr() { return receiveMyPtr(MyPtr()); }
// CHECK-LABEL: define dso_local i32 @"?passMyPtr@@Y{{.*}}"
// CHECK: [[TMP:%[^ ]*]] = alloca %struct.MyPtr, align 8
// CHECK: call x86_thiscallcc %struct.MyPtr* @"??0MyPtr@@QAE@XZ"(%struct.MyPtr* [[TMP]])
// CHECK: call i32 @"?receiveMyPtr@@Y{{.*}}"(%struct.MyPtr* [[TMP]])