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[ARM64-BE] Correctly deal with single element HFAs in varargs. 

Just because the first "if" didn't fire, doesn't mean we can not have
an HFA in the "else" clause.

llvm-svn: 208216
This commit is contained in:
James Molloy 2014-05-07 14:45:55 +00:00
parent 6d58e0726d
commit 467be60748
2 changed files with 17 additions and 2 deletions
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6
clang/lib/CodeGen/TargetInfo.cpp
View File

@ -3550,7 +3550,8 @@ static llvm::Value *EmitAArch64VAArg(llvm::Value *VAListAddr, QualType Ty,
const Type *Base = 0;
uint64_t NumMembers;
if (isHomogeneousAggregate(Ty, Base, Ctx, &NumMembers) && NumMembers > 1) {
bool IsHFA = isHomogeneousAggregate(Ty, Base, Ctx, &NumMembers);
if (IsHFA && NumMembers > 1) {
// Homogeneous aggregates passed in registers will have their elements split
// and stored 16-bytes apart regardless of size (they're notionally in qN,
// qN+1, ...). We reload and store into a temporary local variable
@ -3579,7 +3580,8 @@ static llvm::Value *EmitAArch64VAArg(llvm::Value *VAListAddr, QualType Ty,
} else {
// Otherwise the object is contiguous in memory
unsigned BeAlign = reg_top_index == 2 ? 16 : 8;
if (CGF.CGM.getDataLayout().isBigEndian() && !isAggregateTypeForABI(Ty) &&
if (CGF.CGM.getDataLayout().isBigEndian() &&
(IsHFA || !isAggregateTypeForABI(Ty)) &&
Ctx.getTypeSize(Ty) < (BeAlign * 8)) {
int Offset = BeAlign - Ctx.getTypeSize(Ty) / 8;
BaseAddr = CGF.Builder.CreatePtrToInt(BaseAddr, CGF.Int64Ty);

13
clang/test/CodeGen/arm64-be-hfa-vararg.c Normal file
View File

@ -0,0 +1,13 @@
// RUN: %clang_cc1 -triple arm64_be-linux-gnu -ffreestanding -emit-llvm -O0 -o - %s | FileCheck %s
#include <stdarg.h>
// A single member HFA must be aligned just like a non-HFA register argument.
double callee(int a, ...) {
// CHECK: %align_be = add i64 %{{.*}}, 8
va_list vl;
va_start(vl, a);
double result = va_arg(vl, struct { double a; }).a;
va_end(vl);
return result;
}