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llvm-project/clang/test/CodeGen/arm-bitfield-alignment.c

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ARM & AArch64: convert asm tests to LLVM IR and restrict optimizations. This is mostly a one-time autoconversion of tests that checked assembly after "-Owhatever" compiles to only run "opt -mem2reg" and check the assembly. This should make them much more stable to changes in LLVM so they won't break on unrelated changes. "opt -mem2reg" is a compromise designed to increase the readability of tests that check dataflow, while minimizing dependency on LLVM. Hopefully mem2reg is stable enough that no surpises will come along. Should address http://llvm.org/PR26815. llvm-svn: 263048
2016-03-10 02:54:42 +08:00
// RUN: %clang_cc1 -triple arm-none-eabi -ffreestanding -emit-llvm -o - %s | FileCheck %s
// RUN: %clang_cc1 -triple aarch64 -ffreestanding -emit-llvm -o - %s | FileCheck %s
[ARM/AArch64] Enforce alignment for bitfielded structs When creating a global variable with a type of a struct with bitfields, we must forcibly set the alignment of the global from the RecordDecl. We must do this so that the proper bitfield alignment makes its way down to LLVM, since clang will mangle the bitfields into one large type. llvm-svn: 235976
2015-04-28 19:24:54 +08:00
extern struct T {
int b0 : 8;
int b1 : 24;
int b2 : 1;
} g;
int func() {
return g.b1;
}
// CHECK: @g = external global %struct.T, align 4
// CHECK: %{{.*}} = load i64, i64* bitcast (%struct.T* @g to i64*), align 4