llvm-project/clang/test/CodeGen/regparm-struct.c
Nikita Popov 158d72d728
[Clang] Set writable and dead_on_unwind attributes on sret arguments (#77116)
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.
2024-01-11 09:46:54 +01:00

178 lines
4.1 KiB
C

// RUN: %clang_cc1 -triple i386-unknown-unknown %s -emit-llvm -o - | FileCheck %s
__attribute__((regparm(3))) void f1(int a, int b, int c, int d);
// CHECK: declare void @f1(i32 inreg noundef, i32 inreg noundef, i32 inreg noundef, i32 noundef)
void g1(void) {
f1(41, 42, 43, 44);
}
struct s1 {
int x1;
};
__attribute__((regparm(3))) void f2(int a, int b, struct s1 c, int d);
// CHECK: declare void @f2(i32 inreg noundef, i32 inreg noundef, i32 inreg, i32 noundef)
void g2(void) {
struct s1 x = {43};
f2(41, 42, x, 44);
}
struct s2 {
int x1;
int x2;
};
__attribute__((regparm(3))) void f3(int a, int b, struct s2 c, int d);
// CHECK: declare void @f3(i32 inreg noundef, i32 inreg noundef, i32, i32, i32 noundef)
void g3(void) {
struct s2 x = {43, 44};
f3(41, 42, x, 45);
}
__attribute__((regparm(3))) void f4(int a, struct s2 b, int c);
// CHECK: declare void @f4(i32 inreg noundef, i32 inreg, i32 inreg, i32 noundef)
void g4(void) {
struct s2 x = {42, 43};
f4(41, x, 44);
}
struct s3 {
int x1;
int x2;
int x3;
};
__attribute__((regparm(3))) void f5(int a, struct s3 b, int c);
// CHECK: declare void @f5(i32 inreg noundef, i32, i32, i32, i32 noundef)
void g5(void) {
struct s3 x = {42, 43, 44};
f5(41, x, 45);
}
__attribute__((regparm(3))) void f6(struct s3 a, int b);
// CHECK: declare void @f6(i32 inreg, i32 inreg, i32 inreg, i32 noundef)
void g6(void) {
struct s3 x = {41, 42, 43};
f6(x, 44);
}
struct s4 {
int x1;
int x2;
int x3;
int x4;
};
__attribute__((regparm(3))) void f7(struct s4 a, int b);
// CHECK: declare void @f7(i32, i32, i32, i32, i32 noundef)
void g7(void) {
struct s4 x = {41, 42, 43, 44};
f7(x, 45);
}
__attribute__((regparm(3))) void f8(float a, int b);
// CHECK: declare void @f8(float noundef, i32 inreg noundef)
void g8(void) {
f8(41, 42);
}
struct s5 {
float x1;
};
__attribute__((regparm(3))) void f9(struct s5 a, int b);
// CHECK: declare void @f9(float, i32 inreg noundef)
void g9(void) {
struct s5 x = {41};
f9(x, 42);
}
struct s6 {
float x1;
int x2;
};
__attribute__((regparm(3))) void f10(struct s6 a, int b);
// CHECK: declare void @f10(i32 inreg, i32 inreg, i32 inreg noundef)
void g10(void) {
struct s6 x = {41, 42};
f10(x, 43);
}
struct s7 {
float x1;
int x2;
float x3;
};
__attribute__((regparm(3))) void f11(struct s7 a, int b);
// CHECK: declare void @f11(i32 inreg, i32 inreg, i32 inreg, i32 noundef)
void g11(void) {
struct s7 x = {41, 42, 43};
f11(x, 44);
}
struct s8 {
float x1;
float x2;
};
__attribute__((regparm(3))) void f12(struct s8 a, int b);
// CHECK: declare void @f12(i32 inreg, i32 inreg, i32 inreg noundef)
void g12(void) {
struct s8 x = {41, 42};
f12(x, 43);
}
struct s9 {
float x1;
float x2;
float x3;
};
__attribute__((regparm(3))) void f13(struct s9 a, int b);
// CHECK: declare void @f13(i32 inreg, i32 inreg, i32 inreg, i32 noundef)
void g13(void) {
struct s9 x = {41, 42, 43};
f13(x, 44);
}
struct s10 {
double x1;
};
__attribute__((regparm(3))) void f14(struct s10 a, int b, int c);
// CHECK: declare void @f14(double, i32 inreg noundef, i32 inreg noundef)
void g14(void) {
struct s10 x = { 41 };
f14(x, 42, 43);
}
struct s11 {
double x1;
double x2;
};
__attribute__((regparm(3))) void f15(struct s11 a, int b);
// CHECK: declare void @f15(double, double, i32 noundef)
void g15(void) {
struct s11 x = { 41, 42 };
f15(x, 43);
}
struct s12 {
double x1;
float x2;
};
__attribute__((regparm(3))) void f16(struct s12 a, int b);
// CHECK: declare void @f16(i32 inreg, i32 inreg, i32 inreg, i32 noundef)
void g16(void) {
struct s12 x = { 41, 42 };
f16(x, 43);
}
__attribute__((regparm(3))) struct s12 f17(int a, int b, int c);
// CHECK: declare void @f17(ptr dead_on_unwind inreg writable sret(%struct.s12) align 4, i32 inreg noundef, i32 inreg noundef, i32 noundef)
void g17(void) {
f17(41, 42, 43);
}
struct s13 {
struct inner {
float x;
} y;
};
__attribute__((regparm(3))) void f18(struct s13 a, int b, int c, int d);
// CHECK: declare void @f18(ptr noundef byval(%struct.s13) align 4, i32 inreg noundef, i32 inreg noundef, i32 inreg noundef)
void g18(void) {
struct s13 x = {{41}};
f18(x, 42, 43, 44);
}