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llvm-project/clang/test/CodeGenCXX/volatile-1.cpp

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// RUN: %clang_cc1 -Wno-unused-value -triple %itanium_abi_triple -emit-llvm %s -std=c++98 -o - | FileCheck %s
// RUN: %clang_cc1 -Wno-unused-value -triple %itanium_abi_triple -emit-llvm %s -std=c++11 -o - | FileCheck -check-prefix=CHECK -check-prefix=CHECK11 %s
// CHECK: @i = {{(dso_local )?}}global [[INT:i[0-9]+]] 0
volatile int i, j, k;
volatile int ar[5];
volatile char c;
// CHECK: @ci = {{(dso_local )?}}global [[CINT:.*]] zeroinitializer
volatile _Complex int ci;
volatile struct S {
#ifdef __cplusplus
void operator =(volatile struct S&o) volatile;
#endif
int i;
} a, b;
//void operator =(volatile struct S&o1, volatile struct S&o2) volatile;
int printf(const char *, ...);
// CHECK: define {{.*}}void @{{.*}}test
void test() {
asm("nop"); // CHECK: call void asm
// should not load in C++98
i;
// CHECK11-NEXT: load volatile [[INT]], [[INT]]* @i
(float)(ci);
// CHECK-NEXT: load volatile [[INT]], [[INT]]* getelementptr inbounds ([[CINT]], [[CINT]]* @ci, i32 0, i32 0)
// CHECK-NEXT: load volatile [[INT]], [[INT]]* getelementptr inbounds ([[CINT]], [[CINT]]* @ci, i32 0, i32 1)
// CHECK-NEXT: sitofp [[INT]]
// These are not uses in C++98:
// [expr.static.cast]p6:
// The lvalue-to-rvalue . . . conversions are not applied to the expression.
(void)ci;
// CHECK11-NEXT: load volatile [[INT]], [[INT]]* getelementptr inbounds ([[CINT]], [[CINT]]* @ci, i32 0, i32 0)
// CHECK11-NEXT: load volatile [[INT]], [[INT]]* getelementptr inbounds ([[CINT]], [[CINT]]* @ci, i32 0, i32 1)
(void)a;
(void)(ci=ci);
// CHECK-NEXT: [[R:%.*]] = load volatile [[INT]], [[INT]]* getelementptr inbounds ([[CINT]], [[CINT]]* @ci, i32 0, i32 0)
// CHECK-NEXT: [[I:%.*]] = load volatile [[INT]], [[INT]]* getelementptr inbounds ([[CINT]], [[CINT]]* @ci, i32 0, i32 1)
// CHECK-NEXT: store volatile [[INT]] [[R]], [[INT]]* getelementptr inbounds ([[CINT]], [[CINT]]* @ci, i32 0, i32 0)
// CHECK-NEXT: store volatile [[INT]] [[I]], [[INT]]* getelementptr inbounds ([[CINT]], [[CINT]]* @ci, i32 0, i32 1)
(void)(i=j);
// CHECK-NEXT: [[T:%.*]] = load volatile [[INT]], [[INT]]* @j
// CHECK-NEXT: store volatile [[INT]] [[T]], [[INT]]* @i
ci+=ci;
// CHECK-NEXT: [[R1:%.*]] = load volatile [[INT]], [[INT]]* getelementptr inbounds ([[CINT]], [[CINT]]* @ci, i32 0, i32 0)
// CHECK-NEXT: [[I1:%.*]] = load volatile [[INT]], [[INT]]* getelementptr inbounds ([[CINT]], [[CINT]]* @ci, i32 0, i32 1)
// CHECK-NEXT: [[R2:%.*]] = load volatile [[INT]], [[INT]]* getelementptr inbounds ([[CINT]], [[CINT]]* @ci, i32 0, i32 0)
// CHECK-NEXT: [[I2:%.*]] = load volatile [[INT]], [[INT]]* getelementptr inbounds ([[CINT]], [[CINT]]* @ci, i32 0, i32 1)
// Not sure why they're ordered this way.
// CHECK-NEXT: [[R:%.*]] = add [[INT]] [[R2]], [[R1]]
// CHECK-NEXT: [[I:%.*]] = add [[INT]] [[I2]], [[I1]]
// CHECK-NEXT: store volatile [[INT]] [[R]], [[INT]]* getelementptr inbounds ([[CINT]], [[CINT]]* @ci, i32 0, i32 0)
// CHECK-NEXT: store volatile [[INT]] [[I]], [[INT]]* getelementptr inbounds ([[CINT]], [[CINT]]* @ci, i32 0, i32 1)
// Note that C++ requires an extra load volatile over C from the LHS of the '+'.
(ci += ci) + ci;
// CHECK-NEXT: [[R1:%.*]] = load volatile [[INT]], [[INT]]* getelementptr inbounds ([[CINT]], [[CINT]]* @ci, i32 0, i32 0)
// CHECK-NEXT: [[I1:%.*]] = load volatile [[INT]], [[INT]]* getelementptr inbounds ([[CINT]], [[CINT]]* @ci, i32 0, i32 1)
// CHECK-NEXT: [[R2:%.*]] = load volatile [[INT]], [[INT]]* getelementptr inbounds ([[CINT]], [[CINT]]* @ci, i32 0, i32 0)
// CHECK-NEXT: [[I2:%.*]] = load volatile [[INT]], [[INT]]* getelementptr inbounds ([[CINT]], [[CINT]]* @ci, i32 0, i32 1)
// CHECK-NEXT: [[R:%.*]] = add [[INT]] [[R2]], [[R1]]
// CHECK-NEXT: [[I:%.*]] = add [[INT]] [[I2]], [[I1]]
// CHECK-NEXT: store volatile [[INT]] [[R]], [[INT]]* getelementptr inbounds ([[CINT]], [[CINT]]* @ci, i32 0, i32 0)
// CHECK-NEXT: store volatile [[INT]] [[I]], [[INT]]* getelementptr inbounds ([[CINT]], [[CINT]]* @ci, i32 0, i32 1)
// CHECK-NEXT: [[R1:%.*]] = load volatile [[INT]], [[INT]]* getelementptr inbounds ([[CINT]], [[CINT]]* @ci, i32 0, i32 0)
// CHECK-NEXT: [[I1:%.*]] = load volatile [[INT]], [[INT]]* getelementptr inbounds ([[CINT]], [[CINT]]* @ci, i32 0, i32 1)
// CHECK-NEXT: [[R2:%.*]] = load volatile [[INT]], [[INT]]* getelementptr inbounds ([[CINT]], [[CINT]]* @ci, i32 0, i32 0)
// CHECK-NEXT: [[I2:%.*]] = load volatile [[INT]], [[INT]]* getelementptr inbounds ([[CINT]], [[CINT]]* @ci, i32 0, i32 1)
// These additions can be elided.
// CHECK-NEXT: add [[INT]] [[R1]], [[R2]]
// CHECK-NEXT: add [[INT]] [[I1]], [[I2]]
asm("nop"); // CHECK-NEXT: call void asm
// Extra load volatile in C++.
(i += j) + k;
// CHECK-NEXT: load volatile
// CHECK-NEXT: load volatile
// CHECK-NEXT: add nsw [[INT]]
// CHECK-NEXT: store volatile
// CHECK-NEXT: load volatile
// CHECK-NEXT: load volatile
// CHECK-NEXT: add nsw [[INT]]
asm("nop"); // CHECK-NEXT: call void asm
// Extra load volatile in C++.
(i += j) + 1;
// CHECK-NEXT: load volatile
// CHECK-NEXT: load volatile
// CHECK-NEXT: add nsw [[INT]]
// CHECK-NEXT: store volatile
// CHECK-NEXT: load volatile
// CHECK-NEXT: add nsw [[INT]]
asm("nop"); // CHECK-NEXT: call void asm
ci+ci;
// CHECK-NEXT: load volatile
// CHECK-NEXT: load volatile
// CHECK-NEXT: load volatile
// CHECK-NEXT: load volatile
// CHECK-NEXT: add [[INT]]
// CHECK-NEXT: add [[INT]]
__real i;
+ci;
// CHECK-NEXT: load volatile
// CHECK-NEXT: load volatile
asm("nop"); // CHECK-NEXT: call void asm
(void)(i=i);
// CHECK-NEXT: load volatile
// CHECK-NEXT: store volatile
(float)(i=i);
// CHECK-NEXT: load volatile
// CHECK-NEXT: store volatile
// CHECK-NEXT: load volatile
// CHECK-NEXT: sitofp
(void)i; // This is now a load in C++11
// CHECK11-NEXT: load volatile
i=i;
// CHECK-NEXT: load volatile
// CHECK-NEXT: store volatile
// Extra load volatile in C++.
i=i=i;
// CHECK-NEXT: load volatile
// CHECK-NEXT: store volatile
// CHECK-NEXT: load volatile
// CHECK-NEXT: store volatile
(void)__builtin_choose_expr(0, i=i, j=j);
// CHECK-NEXT: load volatile
// CHECK-NEXT: store volatile
k ? (i=i) : (j=j);
// CHECK-NEXT: load volatile
// CHECK-NEXT: icmp
// CHECK-NEXT: br i1
// CHECK: load volatile
// CHECK-NEXT: store volatile
// CHECK-NEXT: br label
// CHECK: load volatile
// CHECK-NEXT: store volatile
// CHECK-NEXT: br label
// CHECK: phi
(void)(i,(i=i)); // first i is also a load in C++11
// CHECK11-NEXT: load volatile
// CHECK-NEXT: load volatile
// CHECK-NEXT: store volatile
i=i,k; // k is also a load in C++11
// CHECK-NEXT: load volatile [[INT]], [[INT]]* @i
// CHECK-NEXT: store volatile {{.*}}, [[INT]]* @i
// CHECK11-NEXT: load volatile [[INT]], [[INT]]* @k
(i=j,k=j);
// CHECK-NEXT: load volatile [[INT]], [[INT]]* @j
// CHECK-NEXT: store volatile {{.*}}, [[INT]]* @i
// CHECK-NEXT: load volatile [[INT]], [[INT]]* @j
// CHECK-NEXT: store volatile {{.*}}, [[INT]]* @k
(i=j,k); // k is also a load in C++11
// CHECK-NEXT: load volatile [[INT]], [[INT]]* @j
// CHECK-NEXT: store volatile {{.*}}, [[INT]]* @i
// CHECK11-NEXT: load volatile [[INT]], [[INT]]* @k
(i,j); // i and j both are loads in C++11
// CHECK11-NEXT: load volatile [[INT]], [[INT]]* @i
// CHECK11-NEXT: load volatile [[INT]], [[INT]]* @j
// Extra load in C++.
i=c=k;
// CHECK-NEXT: load volatile
// CHECK-NEXT: trunc
// CHECK-NEXT: store volatile
// CHECK-NEXT: load volatile
// CHECK-NEXT: sext
// CHECK-NEXT: store volatile
i+=k;
// CHECK-NEXT: load volatile
// CHECK-NEXT: load volatile
// CHECK-NEXT: add nsw [[INT]]
// CHECK-NEXT: store volatile
ci; // ci is a load in C++11
// CHECK11-NEXT: load volatile {{.*}} @ci, i32 0, i32 0
// CHECK11-NEXT: load volatile {{.*}} @ci, i32 0, i32 1
asm("nop"); // CHECK-NEXT: call void asm
(int)ci;
// CHECK-NEXT: load volatile {{.*}} @ci, i32 0, i32 0
// CHECK-NEXT: load volatile {{.*}} @ci, i32 0, i32 1
(bool)ci;
// CHECK-NEXT: load volatile {{.*}} @ci, i32 0, i32 0
// CHECK-NEXT: load volatile {{.*}} @ci, i32 0, i32 1
// CHECK-NEXT: icmp ne
// CHECK-NEXT: icmp ne
// CHECK-NEXT: or i1
ci=ci;
// CHECK-NEXT: load volatile
// CHECK-NEXT: load volatile
// CHECK-NEXT: store volatile
// CHECK-NEXT: store volatile
asm("nop"); // CHECK-NEXT: call void asm
// Extra load in C++.
ci=ci=ci;
// CHECK-NEXT: load volatile
// CHECK-NEXT: load volatile
// CHECK-NEXT: store volatile
// CHECK-NEXT: store volatile
// CHECK-NEXT: load volatile
// CHECK-NEXT: load volatile
// CHECK-NEXT: store volatile
// CHECK-NEXT: store volatile
__imag ci = __imag ci = __imag ci;
// CHECK-NEXT: [[T:%.*]] = load volatile [[INT]], [[INT]]* getelementptr inbounds ([[CINT]], [[CINT]]* @ci, i32 0, i32 1)
// CHECK-NEXT: store volatile [[INT]] [[T]], [[INT]]* getelementptr inbounds ([[CINT]], [[CINT]]* @ci, i32 0, i32 1)
// CHECK-NEXT: [[T:%.*]] = load volatile [[INT]], [[INT]]* getelementptr inbounds ([[CINT]], [[CINT]]* @ci, i32 0, i32 1)
// CHECK-NEXT: store volatile [[INT]] [[T]], [[INT]]* getelementptr inbounds ([[CINT]], [[CINT]]* @ci, i32 0, i32 1)
__real (i = j);
// CHECK-NEXT: load volatile
// CHECK-NEXT: store volatile
__imag i;
// ============================================================
// FIXME: Test cases we get wrong.
// A use. We load all of a into a copy of a, then load i. gcc forgets to do
// the assignment.
// (a = a).i;
// ============================================================
// Test cases where we intentionally differ from gcc, due to suspected bugs in
// gcc.
// Not a use. gcc forgets to do the assignment.
// CHECK-NEXT: call {{.*}}void
((a=a),a);
// Not a use. gcc gets this wrong, it doesn't emit the copy!
// CHECK-NEXT: call {{.*}}void
(void)(a=a);
// Not a use. gcc got this wrong in 4.2 and omitted the side effects
// entirely, but it is fixed in 4.4.0.
__imag (i = j);
// CHECK-NEXT: load volatile
// CHECK-NEXT: store volatile
// C++ does an extra load here. Note that we have to do full loads.
(float)(ci=ci);
// CHECK-NEXT: load volatile
// CHECK-NEXT: load volatile
// CHECK-NEXT: store volatile
// CHECK-NEXT: store volatile
// CHECK-NEXT: load volatile
// CHECK-NEXT: load volatile
// CHECK-NEXT: sitofp
// Not a use, bug? gcc treats this as not a use, that's probably a
// bug due to tree folding ignoring volatile.
(int)(ci=ci);
// CHECK-NEXT: load volatile
// CHECK-NEXT: load volatile
// CHECK-NEXT: store volatile
// CHECK-NEXT: store volatile
// CHECK-NEXT: load volatile
// CHECK-NEXT: load volatile
// A use.
(float)(i=i);
// CHECK-NEXT: load volatile
// CHECK-NEXT: store volatile
// CHECK-NEXT: load volatile
// CHECK-NEXT: sitofp
// A use. gcc treats this as not a use, that's probably a bug due to tree
// folding ignoring volatile.
(int)(i=i);
// CHECK-NEXT: load volatile
// CHECK-NEXT: store volatile
// CHECK-NEXT: load volatile
// A use.
-(i=j);
// CHECK-NEXT: load volatile
// CHECK-NEXT: store volatile
// CHECK-NEXT: load volatile
// CHECK-NEXT: sub
// A use. gcc treats this a not a use, that's probably a bug due to tree
// folding ignoring volatile.
+(i=k);
// CHECK-NEXT: load volatile
// CHECK-NEXT: store volatile
// CHECK-NEXT: load volatile
// A use. gcc treats this a not a use, that's probably a bug due to tree
// folding ignoring volatile.
__real (ci=ci);
// CHECK-NEXT: load volatile
// CHECK-NEXT: load volatile
// CHECK-NEXT: store volatile
// CHECK-NEXT: store volatile
// A use.
i + 0;
// CHECK-NEXT: load volatile
// CHECK-NEXT: add
// A use.
(i=j) + i;
// CHECK-NEXT: load volatile
// CHECK-NEXT: store volatile
// CHECK-NEXT: load volatile
// CHECK-NEXT: load volatile
// CHECK-NEXT: add
// A use. gcc treats this as not a use, that's probably a bug due to tree
// folding ignoring volatile.
(i=j) + 0;
// CHECK-NEXT: load volatile
// CHECK-NEXT: store volatile
// CHECK-NEXT: load volatile
// CHECK-NEXT: add
(i,j)=k; // i is also a load in C++11
// CHECK-NEXT: load volatile [[INT]], [[INT]]* @k
// CHECK11-NEXT: load volatile [[INT]], [[INT]]* @i
// CHECK-NEXT: store volatile {{.*}}, [[INT]]* @j
(j=k,i)=i;
// CHECK-NEXT: load volatile [[INT]], [[INT]]* @i
// CHECK-NEXT: load volatile [[INT]], [[INT]]* @k
// CHECK-NEXT: store volatile {{.*}}, [[INT]]* @j
// CHECK-NEXT: store volatile {{.*}}, [[INT]]* @i
// CHECK-NEXT: ret void
}
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