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4cc791bc98
The data size is required for implementing the `memmove` optimization for `std::copy`, `std::move` etc. correctly as well as replacing `__compressed_pair` with `[[no_unique_address]]` in libc++. Since the compiler already knows the data size, we can avoid some complexity by exposing that information.
20 lines
806 B
C++
20 lines
806 B
C++
// RUN: %clang_cc1 -triple x86_64-unknown-gnu-linux -emit-llvm %s -o - | FileCheck %s
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// CHECK-LABEL: define dso_local noundef i32 @_Z4testi(
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// CHECK-SAME: i32 noundef [[I:%.*]]) #[[ATTR0:[0-9]+]] {
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// CHECK-NEXT: entry:
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// CHECK-NEXT: [[I_ADDR:%.*]] = alloca i32, align 4
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// CHECK-NEXT: store i32 [[I]], ptr [[I_ADDR]], align 4
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// CHECK-NEXT: [[TMP0:%.*]] = load i32, ptr [[I_ADDR]], align 4
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// CHECK-NEXT: [[INC:%.*]] = add nsw i32 [[TMP0]], 1
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// CHECK-NEXT: store i32 [[INC]], ptr [[I_ADDR]], align 4
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// CHECK-NEXT: [[TMP1:%.*]] = zext i32 [[TMP0]] to i64
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// CHECK-NEXT: [[TMP2:%.*]] = mul nuw i64 4, [[TMP1]]
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// CHECK-NEXT: [[TMP3:%.*]] = load i32, ptr [[I_ADDR]], align 4
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// CHECK-NEXT: ret i32 [[TMP3]]
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//
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int test(int i) {
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(void)__datasizeof(int[i++]);
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return i;
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}
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