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Make PrologEpilogInserter save/restore all callee saved registers

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in functions which call __builtin_unwind_init()

__builtin_unwind_init() is an undocumented gcc intrinsic which has this effect,
and is used in libgcc_eh.

Goes part of the way toward fixing PR8541.

Merged from r183984
Author: Derek Schuff <dschuff@google.com>
Date:   Fri Jun 14 16:15:29 2013 +0000

git-svn-id: https://llvm.org/svn/llvm-project/llvm/branches/release_33@190578 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Tom Stellard 2013-09-12 03:18:08 +00:00
parent f667db3652
commit 07c8da8d24
4 changed files with 60 additions and 1 deletions
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3
include/llvm/IR/Intrinsics.td
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@ -347,6 +347,9 @@ def int_eh_typeid_for : Intrinsic<[llvm_i32_ty], [llvm_ptr_ty], [IntrNoMem]>;
def int_eh_return_i32 : Intrinsic<[], [llvm_i32_ty, llvm_ptr_ty]>;
def int_eh_return_i64 : Intrinsic<[], [llvm_i64_ty, llvm_ptr_ty]>;
// __builtin_unwind_init is an undocumented GCC intrinsic that causes all
// callee-saved registers to be saved and restored (regardless of whether they
// are used) in the calling function. It is used by libgcc_eh.
def int_eh_unwind_init: Intrinsic<[]>,
GCCBuiltin<"__builtin_unwind_init">;

4
lib/CodeGen/PrologEpilogInserter.cpp
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@ -29,6 +29,7 @@
#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/CodeGen/MachineInstr.h"
#include "llvm/CodeGen/MachineLoopInfo.h"
#include "llvm/CodeGen/MachineModuleInfo.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
#include "llvm/CodeGen/RegisterScavenging.h"
#include "llvm/IR/InlineAsm.h"
@ -214,7 +215,8 @@ void PEI::calculateCalleeSavedRegisters(MachineFunction &F) {
std::vector<CalleeSavedInfo> CSI;
for (unsigned i = 0; CSRegs[i]; ++i) {
unsigned Reg = CSRegs[i];
if (F.getRegInfo().isPhysRegUsed(Reg)) {
// Functions which call __builtin_unwind_init get all their registers saved.
if (F.getRegInfo().isPhysRegUsed(Reg) || F.getMMI().callsUnwindInit()) {
// If the reg is modified, save it!
CSI.push_back(CalleeSavedInfo(Reg));
}

18
test/CodeGen/ARM/unwind-init.ll Normal file
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@ -0,0 +1,18 @@
; RUN: llc -mtriple=armv7-unknown-linux-gnueabi < %s | FileCheck %s
; Check that all callee-saved registers are saved and restored in functions
; that call __builtin_unwind_init(). This is its undocumented behavior in gcc,
; and it is used in compiling libgcc_eh.
; See also PR8541
declare void @llvm.eh.unwind.init()
define void @calls_unwind_init() {
call void @llvm.eh.unwind.init()
ret void
}
; CHECK: calls_unwind_init:
; CHECK: push {r4, r5, r6, r7, r8, r9, r10, r11, lr}
; CHECK: vpush {d8, d9, d10, d11, d12, d13, d14, d15}
; CHECK: vpop {d8, d9, d10, d11, d12, d13, d14, d15}
; CHECK: pop {r4, r5, r6, r7, r8, r9, r10, r11, pc}

36
test/CodeGen/X86/unwind-init.ll Normal file
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@ -0,0 +1,36 @@
; RUN: llc -mtriple=x86_64-unknown-linux < %s | FileCheck -check-prefix X8664 %s
; RUN: llc -mtriple=i686-unknown-linux < %s | FileCheck -check-prefix X8632 %s
; Check that all callee-saved registers are saved and restored in functions
; that call __builtin_unwind_init(). This is its undocumented behavior in gcc,
; and it is used in compiling libgcc_eh.
; See also PR8541
declare void @llvm.eh.unwind.init()
define void @calls_unwind_init() {
call void @llvm.eh.unwind.init()
ret void
}
; X8664: calls_unwind_init:
; X8664: pushq %rbp
; X8664: pushq %r15
; X8664: pushq %r14
; X8664: pushq %r13
; X8664: pushq %r12
; X8664: pushq %rbx
; X8664: popq %rbx
; X8664: popq %r12
; X8664: popq %r13
; X8664: popq %r14
; X8664: popq %r15
; X8632: calls_unwind_init:
; X8632: pushl %ebp
; X8632: pushl %ebx
; X8632: pushl %edi
; X8632: pushl %esi
; X8632: popl %esi
; X8632: popl %edi
; X8632: popl %ebx
; X8632: popl %ebp