dnrops
/
clang
mirror of https://github.com/microsoft/clang.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

ARMEB: Fix function result return for composite types 

Reviewed at http://reviews.llvm.org/D4364



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@212261 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Christian Pirker 2014-07-03 09:28:12 +00:00
parent c1f371f3a2
commit 90c138be43
2 changed files with 41 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
lib/CodeGen/TargetInfo.cpp
View File

@ -4379,6 +4379,10 @@ ABIArgInfo ARMABIInfo::classifyReturnType(QualType RetTy,
// are returned indirectly. // are returned indirectly.
uint64_t Size = getContext().getTypeSize(RetTy); uint64_t Size = getContext().getTypeSize(RetTy);
if (Size <= 32) { if (Size <= 32) {
if (getDataLayout().isBigEndian())
// Return in 32 bit integer integer type (as if loaded by LDR, AAPCS 5.4)
return ABIArgInfo::getDirect(llvm::Type::getInt32Ty(getVMContext()));
// Return in the smallest viable integer type. // Return in the smallest viable integer type.
if (Size <= 8) if (Size <= 8)
return ABIArgInfo::getDirect(llvm::Type::getInt8Ty(getVMContext())); return ABIArgInfo::getDirect(llvm::Type::getInt8Ty(getVMContext()));

37
test/CodeGen/arm-be-result-return.c Normal file
View File

@ -0,0 +1,37 @@
// RUN: %clang_cc1 -triple armebv7-arm-none-eabi -emit-llvm -w -o - %s | FileCheck %s
// this tests for AAPCS section 5.4:
// A Composite Type not larger than 4 bytes is returned in r0.
// The format is as if the result had been stored in memory at a
// word-aligned address and then loaded into r0 with an LDR instruction
extern union Us { short s; } us;
union Us callee_us() { return us; }
// CHECK-LABEL: callee_us()
// CHECK: zext i16
// CHECK: shl
// CHECK: ret i32
void caller_us() {
us = callee_us();
// CHECK-LABEL: caller_us()
// CHECK: call i32
// CHECK: lshr i32
// CHECK: trunc i32
}
extern struct Ss { short s; } ss;
struct Ss callee_ss() { return ss; }
// CHECK-LABEL: callee_ss()
// CHECK: zext i16
// CHECK: shl
// CHECK: ret i32
void caller_ss() {
ss = callee_ss();
// CHECK-LABEL: caller_ss()
// CHECK: call i32
// CHECK: lshr i32
// CHECK: trunc i32
}