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Fix PR5279 - don't sliently drop alignment information on stores of types that have alignment less than the natural alignment of the type when it comes from a typedef.

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llvm-svn: 146908
This commit is contained in:
Chris Lattner 2011-12-19 21:16:08 +00:00
parent 494f431097
commit 2415357a05
2 changed files with 35 additions and 1 deletions
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2
clang/lib/CodeGen/CGExpr.cpp
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@ -1443,7 +1443,7 @@ LValue CodeGenFunction::EmitUnaryOpLValue(const UnaryOperator *E) {
QualType T = E->getSubExpr()->getType()->getPointeeType();
assert(!T.isNull() && "CodeGenFunction::EmitUnaryOpLValue: Illegal type");
LValue LV = MakeAddrLValue(EmitScalarExpr(E->getSubExpr()), T);
LValue LV = MakeNaturalAlignAddrLValue(EmitScalarExpr(E->getSubExpr()), T);
LV.getQuals().setAddressSpace(ExprTy.getAddressSpace());
// We should not generate __weak write barrier on indirect reference

34
clang/test/CodeGen/alignment.c
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@ -5,3 +5,37 @@ union {int a[4]; __attribute((aligned(16))) float b[4];} b;
// CHECK: @a = {{.*}}zeroinitializer, align 16
// CHECK: @b = {{.*}}zeroinitializer, align 16
// PR5279 - Reduced alignment on typedef.
typedef int myint __attribute__((aligned(1)));
void test1(myint *p) {
*p = 0;
}
// CHECK: @test1(
// CHECK: store i32 0, i32* {{.*}}, align 1
// CHECK: ret void
// PR5279 - Reduced alignment on typedef.
typedef float __attribute__((vector_size(16), aligned(4))) packedfloat4;
void test2(packedfloat4 *p) {
*p = (packedfloat4) { 3.2f, 2.3f, 0.1f, 0.0f };
}
// CHECK: @test2(
// CHECK: store <4 x float> {{.*}}, align 4
// CHECK: ret void
// PR5279 - Reduced alignment on typedef.
typedef float __attribute__((ext_vector_type(3), aligned(4))) packedfloat3;
void test3(packedfloat3 *p) {
*p = (packedfloat3) { 3.2f, 2.3f, 0.1f };
}
// CHECK: @test3(
// CHECK: store <3 x float> {{.*}}, align 4
// CHECK: ret void