derek.holloway
7502bf64a4
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50 lines
2.2 KiB
C
50 lines
2.2 KiB
C
/* RUN: %clang_cc1 -std=c89 -triple x86_64-pc-win32 -emit-llvm -o - %s | FileCheck %s
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RUN: %clang_cc1 -std=c89 -triple i686-pc-linux -emit-llvm -o - %s | FileCheck %s
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RUN: %clang_cc1 -std=c99 -triple x86_64-pc-win32 -emit-llvm -o - %s | FileCheck %s
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RUN: %clang_cc1 -std=c99 -triple i686-pc-linux -emit-llvm -o - %s | FileCheck %s
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RUN: %clang_cc1 -std=c11 -triple x86_64-pc-win32 -emit-llvm -o - %s | FileCheck %s
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RUN: %clang_cc1 -std=c11 -triple i686-pc-linux -emit-llvm -o - %s | FileCheck %s
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RUN: %clang_cc1 -std=c17 -triple x86_64-pc-win32 -emit-llvm -o - %s | FileCheck %s
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RUN: %clang_cc1 -std=c17 -triple i686-pc-linux -emit-llvm -o - %s | FileCheck %s
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RUN: %clang_cc1 -std=c2x -triple x86_64-pc-win32 -emit-llvm -o - %s | FileCheck %s
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RUN: %clang_cc1 -std=c2x -triple i686-pc-linux -emit-llvm -o - %s | FileCheck %s
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*/
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/* WG14 DR335: yes
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* _Bool bit-fields
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*
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* This validates the runtime behavior from the DR, see dr3xx.c for the compile
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* time enforcement portion.
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*/
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void dr335(void) {
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struct bits_ {
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_Bool bbf1 : 1;
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} bits = { 1 };
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bits.bbf1 = ~bits.bbf1;
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// First, load the value from bits.bbf1 and truncate it down to one-bit.
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// CHECK: %[[LOAD1:.+]] = load i8, ptr {{.+}}, align 1
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// CHECK-NEXT: %[[CLEAR1:.+]] = and i8 %[[LOAD1]], 1
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// CHECK-NEXT: %[[CAST:.+]] = trunc i8 %[[CLEAR1]] to i1
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// CHECK-NEXT: %[[CONV:.+]] = zext i1 %[[CAST]] to i32
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// Second, perform the unary complement.
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// CHECK-NEXT: %[[NOT:.+]] = xor i32 %[[CONV]], -1
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// Finally, test the new value against 0. If it's nonzero, then assign one
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// into the bit-field, otherwise assign zero into the bit-field. Note, this
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// does not perform the operation on the promoted value, so this matches the
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// requirements in C99 6.3.1.2, so a bit-field of type _Bool behaves like a
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// _Bool and not like an [unsigned] int.
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// CHECK-NEXT: %[[TOBOOL:.+]] = icmp ne i32 %[[NOT]], 0
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// CHECK-NEXT: %[[ZERO:.+]] = zext i1 %[[TOBOOL]] to i8
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// CHECK-NEXT: %[[LOAD2:.+]] = load i8, ptr {{.+}}, align 1
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// CHECK-NEXT: %[[CLEAR2:.+]] = and i8 %[[LOAD2]], -2
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// CHECK-NEXT: %[[SET:.+]] = or i8 %[[CLEAR2]], %[[ZERO]]
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// CHECK-NEXT: store i8 %[[SET]], ptr {{.+}}, align 1
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}
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