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.
113 lines
4.3 KiB
C
113 lines
4.3 KiB
C
// RUN: %clang_cc1 -triple i386-unknown-unknown %s -emit-llvm -Wno-strict-prototypes -o - -fblocks | FileCheck %s
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// CHECK: @{{.*}} = internal constant { i32, i32, ptr, ptr, ptr, ptr } { i32 0, i32 24, ptr @__copy_helper_block_4_20r, ptr @__destroy_helper_block_4_20r, ptr @{{.*}}, ptr null }, align 4
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// CHECK: @[[BLOCK_DESCRIPTOR_TMP21:.*]] = internal constant { i32, i32, ptr, ptr, ptr, ptr } { i32 0, i32 24, ptr @__copy_helper_block_4_20r, ptr @__destroy_helper_block_4_20r, ptr @{{.*}}, ptr null }, align 4
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void (^f)(void) = ^{};
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int f0(int (^a0)()) {
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return a0(1, 2, 3);
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}
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// Verify that attributes on blocks are set correctly.
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typedef struct s0 T;
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struct s0 {
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int a[64];
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};
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// CHECK: define internal void @__f2_block_invoke(ptr dead_on_unwind noalias writable sret(%struct.s0) align 4 {{%.*}}, ptr noundef {{%.*}}, ptr noundef byval(%struct.s0) align 4 {{.*}})
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struct s0 f2(struct s0 a0) {
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return ^(struct s0 a1){ return a1; }(a0);
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}
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// This should not crash.
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void *P = ^{
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void *Q = __func__;
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};
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void (^test1)(void) = ^(void) {
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__block int i;
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^ { i = 1; }();
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};
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// CHECK-LABEL: define linkonce_odr hidden void @__copy_helper_block_4_20r(ptr noundef %0, ptr noundef %1) unnamed_addr
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// CHECK: %[[_ADDR:.*]] = alloca ptr, align 4
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// CHECK-NEXT: %[[_ADDR1:.*]] = alloca ptr, align 4
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// CHECK-NEXT: store ptr %0, ptr %[[_ADDR]], align 4
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// CHECK-NEXT: store ptr %1, ptr %[[_ADDR1]], align 4
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// CHECK-NEXT: %[[V2:.*]] = load ptr, ptr %[[_ADDR1]], align 4
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// CHECK-NEXT: %[[V3:.*]] = load ptr, ptr %[[_ADDR]], align 4
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// CHECK-NEXT: %[[V4:.*]] = getelementptr inbounds <{ ptr, i32, i32, ptr, ptr, ptr }>, ptr %[[V2]], i32 0, i32 5
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// CHECK-NEXT: %[[V5:.*]] = getelementptr inbounds <{ ptr, i32, i32, ptr, ptr, ptr }>, ptr %[[V3]], i32 0, i32 5
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// CHECK-NEXT: %[[BLOCKCOPY_SRC:.*]] = load ptr, ptr %[[V4]], align 4
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// CHECK-NEXT: call void @_Block_object_assign(ptr %[[V5]], ptr %[[BLOCKCOPY_SRC]], i32 8)
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// CHECK-NEXT: ret void
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// CHECK-LABEL: define linkonce_odr hidden void @__destroy_helper_block_4_20r(ptr noundef %0) unnamed_addr
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// CHECK: %[[_ADDR:.*]] = alloca ptr, align 4
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// CHECK-NEXT: store ptr %0, ptr %[[_ADDR]], align 4
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// CHECK-NEXT: %[[V1:.*]] = load ptr, ptr %[[_ADDR]], align 4
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// CHECK-NEXT: %[[V2:.*]] = getelementptr inbounds <{ ptr, i32, i32, ptr, ptr, ptr }>, ptr %[[V1]], i32 0, i32 5
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// CHECK-NEXT: %[[V3:.*]] = load ptr, ptr %[[V2]], align 4
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// CHECK-NEXT: call void @_Block_object_dispose(ptr %[[V3]], i32 8)
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// CHECK-NEXT: ret void
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typedef double ftype(double);
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// It's not clear that we *should* support this syntax, but until that decision
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// is made, we should support it properly and not crash.
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ftype ^test2 = ^ftype {
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return 0;
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};
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void f3_helper(void (^)(void));
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void f3(void) {
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_Bool b = 0;
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f3_helper(^{ if (b) {} });
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}
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// The bool can fill in between the header and the long long.
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// Add the appropriate amount of padding between them.
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void f4_helper(long long (^)(void));
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// CHECK-LABEL: define{{.*}} void @f4()
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void f4(void) {
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_Bool b = 0;
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long long ll = 0;
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// CHECK: alloca <{ ptr, i32, i32, ptr, ptr, i8, [3 x i8], i64 }>, align 8
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f4_helper(^{ if (b) return ll; return 0LL; });
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}
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// The alignment after rounding up to the align of F5 is actually
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// greater than the required alignment. Don't assert.
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struct F5 {
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char buffer[32] __attribute((aligned));
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};
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void f5_helper(void (^)(struct F5 *));
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// CHECK-LABEL: define{{.*}} void @f5()
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void f5(void) {
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struct F5 value;
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// CHECK: alloca <{ ptr, i32, i32, ptr, ptr, [12 x i8], [[F5:%.*]] }>, align 16
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f5_helper(^(struct F5 *slot) { *slot = value; });
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}
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void (^b)() = ^{};
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int main(void) {
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(b?: ^{})();
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}
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// CHECK: [[ZERO:%.*]] = load ptr, ptr @b
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// CHECK-NEXT: [[TB:%.*]] = icmp ne ptr [[ZERO]], null
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// CHECK-NEXT: br i1 [[TB]], label [[CT:%.*]], label [[CF:%.*]]
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// CHECK: br label [[CE:%.*]]
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// Ensure that we don't emit helper code in copy/dispose routines for variables
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// that are const-captured.
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void testConstCaptureInCopyAndDestroyHelpers(void) {
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const int x = 0;
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__block int i;
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(^ { i = x; })();
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}
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// CHECK-LABEL: define{{.*}} void @testConstCaptureInCopyAndDestroyHelpers(
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// CHECK: %[[BLOCK_DESCRIPTOR:.*]] = getelementptr inbounds <{ ptr, i32, i32, ptr, ptr, ptr }>, ptr %{{.*}}, i32 0, i32 4
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// CHECK: store ptr @[[BLOCK_DESCRIPTOR_TMP21]], ptr %[[BLOCK_DESCRIPTOR]], align 4
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// CHECK-LABEL: define internal void @__testConstCaptureInCopyAndDestroyHelpers_block_invoke
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