07bb19667a
assignment to volatiles in C. This in effect reverts some of mjs's work in and around r72572. Basically, the C++ standard is quite clear, except that it lies about volatile behavior approximating C's, whereas the C standard is almost actively misleading. llvm-svn: 119344
304 lines
9.9 KiB
C
304 lines
9.9 KiB
C
// RUN: %clang_cc1 -Wno-unused-value -emit-llvm %s -o - | FileCheck %s
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// CHECK: @i = common global [[INT:i[0-9]+]] 0
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volatile int i, j, k;
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volatile int ar[5];
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volatile char c;
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// CHECK: @ci = common global [[CINT:%.*]] zeroinitializer
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volatile _Complex int ci;
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volatile struct S {
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#ifdef __cplusplus
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void operator =(volatile struct S&o) volatile;
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#endif
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int i;
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} a, b;
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//void operator =(volatile struct S&o1, volatile struct S&o2) volatile;
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int printf(const char *, ...);
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// Note that these test results are very much specific to C!
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// Assignments in C++ yield l-values, not r-values, and the situations
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// that do implicit lvalue-to-rvalue conversion are substantially
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// reduced.
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// CHECK: define void @test()
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void test() {
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// CHECK: volatile load [[INT]]* @i
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i;
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// CHECK-NEXT: volatile load [[INT]]* getelementptr inbounds ([[CINT]]* @ci, i32 0, i32 0)
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// CHECK-NEXT: volatile load [[INT]]* getelementptr inbounds ([[CINT]]* @ci, i32 0, i32 1)
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// CHECK-NEXT: sitofp [[INT]]
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(float)(ci);
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// CHECK-NEXT: volatile load [[INT]]* getelementptr inbounds ([[CINT]]* @ci, i32 0, i32 0)
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// CHECK-NEXT: volatile load [[INT]]* getelementptr inbounds ([[CINT]]* @ci, i32 0, i32 1)
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(void)ci;
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// CHECK-NEXT: bitcast
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// CHECK-NEXT: memcpy
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(void)a;
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// CHECK-NEXT: [[R:%.*]] = volatile load [[INT]]* getelementptr inbounds ([[CINT]]* @ci, i32 0, i32 0)
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// CHECK-NEXT: [[I:%.*]] = volatile load [[INT]]* getelementptr inbounds ([[CINT]]* @ci, i32 0, i32 1)
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// CHECK-NEXT: volatile store [[INT]] [[R]], [[INT]]* getelementptr inbounds ([[CINT]]* @ci, i32 0, i32 0)
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// CHECK-NEXT: volatile store [[INT]] [[I]], [[INT]]* getelementptr inbounds ([[CINT]]* @ci, i32 0, i32 1)
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(void)(ci=ci);
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// CHECK-NEXT: [[T:%.*]] = volatile load [[INT]]* @j
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// CHECK-NEXT: volatile store [[INT]] [[T]], [[INT]]* @i
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(void)(i=j);
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// CHECK-NEXT: [[R1:%.*]] = volatile load [[INT]]* getelementptr inbounds ([[CINT]]* @ci, i32 0, i32 0)
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// CHECK-NEXT: [[I1:%.*]] = volatile load [[INT]]* getelementptr inbounds ([[CINT]]* @ci, i32 0, i32 1)
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// CHECK-NEXT: [[R2:%.*]] = volatile load [[INT]]* getelementptr inbounds ([[CINT]]* @ci, i32 0, i32 0)
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// CHECK-NEXT: [[I2:%.*]] = volatile load [[INT]]* getelementptr inbounds ([[CINT]]* @ci, i32 0, i32 1)
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// Not sure why they're ordered this way.
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// CHECK-NEXT: [[R:%.*]] = add [[INT]] [[R2]], [[R1]]
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// CHECK-NEXT: [[I:%.*]] = add [[INT]] [[I2]], [[I1]]
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// CHECK-NEXT: volatile store [[INT]] [[R]], [[INT]]* getelementptr inbounds ([[CINT]]* @ci, i32 0, i32 0)
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// CHECK-NEXT: volatile store [[INT]] [[I]], [[INT]]* getelementptr inbounds ([[CINT]]* @ci, i32 0, i32 1)
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ci+=ci;
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// CHECK-NEXT: [[R1:%.*]] = volatile load [[INT]]* getelementptr inbounds ([[CINT]]* @ci, i32 0, i32 0)
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// CHECK-NEXT: [[I1:%.*]] = volatile load [[INT]]* getelementptr inbounds ([[CINT]]* @ci, i32 0, i32 1)
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// CHECK-NEXT: [[R2:%.*]] = volatile load [[INT]]* getelementptr inbounds ([[CINT]]* @ci, i32 0, i32 0)
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// CHECK-NEXT: [[I2:%.*]] = volatile load [[INT]]* getelementptr inbounds ([[CINT]]* @ci, i32 0, i32 1)
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// CHECK-NEXT: [[R:%.*]] = add [[INT]] [[R2]], [[R1]]
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// CHECK-NEXT: [[I:%.*]] = add [[INT]] [[I2]], [[I1]]
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// CHECK-NEXT: volatile store [[INT]] [[R]], [[INT]]* getelementptr inbounds ([[CINT]]* @ci, i32 0, i32 0)
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// CHECK-NEXT: volatile store [[INT]] [[I]], [[INT]]* getelementptr inbounds ([[CINT]]* @ci, i32 0, i32 1)
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// CHECK-NEXT: [[R2:%.*]] = volatile load [[INT]]* getelementptr inbounds ([[CINT]]* @ci, i32 0, i32 0)
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// CHECK-NEXT: [[I2:%.*]] = volatile load [[INT]]* getelementptr inbounds ([[CINT]]* @ci, i32 0, i32 1)
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// These additions can be elided
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// CHECK-NEXT: add [[INT]] [[R]], [[R2]]
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// CHECK-NEXT: add [[INT]] [[I]], [[I2]]
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(ci += ci) + ci;
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// CHECK-NEXT: call void asm
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asm("nop");
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// CHECK-NEXT: volatile load
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// CHECK-NEXT: volatile load
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// CHECK-NEXT: add nsw [[INT]]
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// CHECK-NEXT: volatile store
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// CHECK-NEXT: volatile load
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// CHECK-NEXT: add nsw [[INT]]
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(i += j) + k;
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// CHECK-NEXT: call void asm
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asm("nop");
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// CHECK-NEXT: volatile load
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// CHECK-NEXT: volatile load
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// CHECK-NEXT: add nsw [[INT]]
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// CHECK-NEXT: volatile store
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// CHECK-NEXT: add nsw [[INT]]
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(i += j) + 1;
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// CHECK-NEXT: call void asm
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asm("nop");
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// CHECK-NEXT: volatile load
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// CHECK-NEXT: volatile load
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// CHECK-NEXT: volatile load
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// CHECK-NEXT: volatile load
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// CHECK-NEXT: add [[INT]]
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// CHECK-NEXT: add [[INT]]
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ci+ci;
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// CHECK-NEXT: volatile load
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__real i;
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// CHECK-NEXT: volatile load
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// CHECK-NEXT: volatile load
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+ci;
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// CHECK-NEXT: call void asm
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asm("nop");
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// CHECK-NEXT: volatile load
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// CHECK-NEXT: volatile store
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(void)(i=i);
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// CHECK-NEXT: volatile load
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// CHECK-NEXT: volatile store
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// CHECK-NEXT: sitofp
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(float)(i=i);
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// CHECK-NEXT: volatile load
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(void)i;
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// CHECK-NEXT: volatile load
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// CHECK-NEXT: volatile store
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i=i;
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// CHECK-NEXT: volatile load
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// CHECK-NEXT: volatile store
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// CHECK-NEXT: volatile store
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i=i=i;
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#ifndef __cplusplus
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// CHECK-NEXT: volatile load
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// CHECK-NEXT: volatile store
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(void)__builtin_choose_expr(0, i=i, j=j);
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#endif
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// CHECK-NEXT: volatile load
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// CHECK-NEXT: icmp
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// CHECK-NEXT: br i1
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// CHECK: volatile load
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// CHECK-NEXT: volatile store
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// CHECK-NEXT: br label
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// CHECK: volatile load
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// CHECK-NEXT: volatile store
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// CHECK-NEXT: br label
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k ? (i=i) : (j=j);
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// CHECK: phi
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// CHECK-NEXT: volatile load
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// CHECK-NEXT: volatile load
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// CHECK-NEXT: volatile store
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(void)(i,(i=i));
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// CHECK-NEXT: volatile load
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// CHECK-NEXT: volatile store
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// CHECK-NEXT: volatile load
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i=i,i;
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// CHECK-NEXT: volatile load
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// CHECK-NEXT: volatile store
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// CHECK-NEXT: volatile load
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// CHECK-NEXT: volatile store
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(i=j,k=j);
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// CHECK-NEXT: volatile load
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// CHECK-NEXT: volatile store
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// CHECK-NEXT: volatile load
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(i=j,k);
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// CHECK-NEXT: volatile load
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// CHECK-NEXT: volatile load
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(i,j);
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// CHECK-NEXT: volatile load
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// CHECK-NEXT: trunc
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// CHECK-NEXT: volatile store
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// CHECK-NEXT: sext
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// CHECK-NEXT: volatile store
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i=c=k;
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// CHECK-NEXT: volatile load
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// CHECK-NEXT: volatile load
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// CHECK-NEXT: add nsw [[INT]]
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// CHECK-NEXT: volatile store
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i+=k;
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// CHECK-NEXT: volatile load
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// CHECK-NEXT: volatile load
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ci;
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#ifndef __cplusplus
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// CHECK-NEXT: volatile load
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// CHECK-NEXT: volatile load
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(int)ci;
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// CHECK-NEXT: volatile load
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// CHECK-NEXT: volatile load
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// CHECK-NEXT: icmp ne
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// CHECK-NEXT: icmp ne
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// CHECK-NEXT: or i1
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(_Bool)ci;
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#endif
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// CHECK-NEXT: volatile load
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// CHECK-NEXT: volatile load
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// CHECK-NEXT: volatile store
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// CHECK-NEXT: volatile store
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ci=ci;
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// CHECK-NEXT: volatile load
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// CHECK-NEXT: volatile load
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// CHECK-NEXT: volatile store
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// CHECK-NEXT: volatile store
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// CHECK-NEXT: volatile store
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// CHECK-NEXT: volatile store
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ci=ci=ci;
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// CHECK-NEXT: [[T:%.*]] = volatile load [[INT]]* getelementptr inbounds ([[CINT]]* @ci, i32 0, i32 1)
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// CHECK-NEXT: volatile store [[INT]] [[T]], [[INT]]* getelementptr inbounds ([[CINT]]* @ci, i32 0, i32 1)
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// CHECK-NEXT: volatile store [[INT]] [[T]], [[INT]]* getelementptr inbounds ([[CINT]]* @ci, i32 0, i32 1)
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__imag ci = __imag ci = __imag ci;
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// CHECK-NEXT: volatile load
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// CHECK-NEXT: volatile store
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__real (i = j);
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// CHECK-NEXT: volatile load
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__imag i;
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// ============================================================
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// FIXME: Test cases we get wrong.
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// A use. We load all of a into a copy of a, then load i. gcc forgets to do
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// the assignment.
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// (a = a).i;
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// ============================================================
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// Test cases where we intentionally differ from gcc, due to suspected bugs in
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// gcc.
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// Not a use. gcc forgets to do the assignment.
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// CHECK-NEXT: call void @llvm.memcpy{{.*}}, i1 true
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// CHECK-NEXT: bitcast
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// CHECK-NEXT: call void @llvm.memcpy{{.*}}, i1 true
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((a=a),a);
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// Not a use. gcc gets this wrong, it doesn't emit the copy!
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// (void)(a=a);
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// Not a use. gcc got this wrong in 4.2 and omitted the side effects
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// entirely, but it is fixed in 4.4.0.
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// CHECK-NEXT: volatile load
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// CHECK-NEXT: volatile store
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__imag (i = j);
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#ifndef __cplusplus
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// A use of the real part
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// CHECK-NEXT: volatile load
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// CHECK-NEXT: volatile load
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// CHECK-NEXT: volatile store
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// CHECK-NEXT: volatile store
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// CHECK-NEXT: sitofp
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(float)(ci=ci);
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// Not a use, bug? gcc treats this as not a use, that's probably a bug due to
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// tree folding ignoring volatile.
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// CHECK-NEXT: volatile load
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// CHECK-NEXT: volatile load
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// CHECK-NEXT: volatile store
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// CHECK-NEXT: volatile store
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(int)(ci=ci);
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#endif
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// A use.
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// CHECK-NEXT: volatile load
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// CHECK-NEXT: volatile store
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// CHECK-NEXT: sitofp
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(float)(i=i);
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// A use. gcc treats this as not a use, that's probably a bug due to tree
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// folding ignoring volatile.
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// CHECK-NEXT: volatile load
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// CHECK-NEXT: volatile store
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(int)(i=i);
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// A use.
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// CHECK-NEXT: volatile load
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// CHECK-NEXT: volatile store
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// CHECK-NEXT: sub
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-(i=j);
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// A use. gcc treats this a not a use, that's probably a bug due to tree
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// folding ignoring volatile.
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// CHECK-NEXT: volatile load
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// CHECK-NEXT: volatile store
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+(i=k);
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// A use. gcc treats this a not a use, that's probably a bug due to tree
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// folding ignoring volatile.
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// CHECK-NEXT: volatile load
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// CHECK-NEXT: volatile load
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// CHECK-NEXT: volatile store
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// CHECK-NEXT: volatile store
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__real (ci=ci);
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// A use.
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// CHECK-NEXT: volatile load
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// CHECK-NEXT: add
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i + 0;
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// A use.
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// CHECK-NEXT: volatile load
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// CHECK-NEXT: volatile store
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// CHECK-NEXT: volatile load
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// CHECK-NEXT: add
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(i=j) + i;
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// A use. gcc treats this as not a use, that's probably a bug due to tree
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// folding ignoring volatile.
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// CHECK-NEXT: volatile load
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// CHECK-NEXT: volatile store
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// CHECK-NEXT: add
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(i=j) + 0;
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#ifdef __cplusplus
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(i,j)=k;
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(j=k,i)=i;
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struct { int x; } s, s1;
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printf("s is at %p\n", &s);
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printf("s is at %p\n", &(s = s1));
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printf("s.x is at %p\n", &((s = s1).x));
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#endif
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}
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