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[mips] Make sure that we don't adjust the stack pointer by zero amount.

Browse Source 
Reviewers: dsanders

Reviewed By: dsanders

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D8638

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@233904 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Vasileios Kalintiris 2015-04-02 10:14:54 +00:00
parent 2278d23c53
commit cb64898a22
3 changed files with 26 additions and 0 deletions
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3
lib/Target/Mips/Mips16InstrInfo.cpp
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@ -293,6 +293,9 @@ void Mips16InstrInfo::adjustStackPtrBigUnrestricted(
void Mips16InstrInfo::adjustStackPtr(unsigned SP, int64_t Amount,
MachineBasicBlock &MBB,
MachineBasicBlock::iterator I) const {
if (Amount == 0)
return;
if (isInt<16>(Amount)) // need to change to addiu sp, ....and isInt<16>
BuildAddiuSpImm(MBB, I, Amount);
else

3
lib/Target/Mips/MipsSEInstrInfo.cpp
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@ -364,6 +364,9 @@ void MipsSEInstrInfo::adjustStackPtr(unsigned SP, int64_t Amount,
unsigned ADDu = STI.isABI_N64() ? Mips::DADDu : Mips::ADDu;
unsigned ADDiu = STI.isABI_N64() ? Mips::DADDiu : Mips::ADDiu;
if (Amount == 0)
return;
if (isInt<16>(Amount))// addi sp, sp, amount
BuildMI(MBB, I, DL, get(ADDiu), SP).addReg(SP).addImm(Amount);
else { // Expand immediate that doesn't fit in 16-bit.

20
test/CodeGen/Mips/adjust-callstack-sp.ll Normal file
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@ -0,0 +1,20 @@
; RUN: llc < %s -march=mips -mcpu=mips16 | FileCheck %s -check-prefix=M16
; RUN: llc < %s -march=mips -mcpu=mips2 | FileCheck %s -check-prefix=GP32
; RUN: llc < %s -march=mips -mcpu=mips32 | FileCheck %s -check-prefix=GP32
; RUN: llc < %s -march=mips -mcpu=mips32r6 | FileCheck %s -check-prefix=GP32
; RUN: llc < %s -march=mips -mcpu=mips3 | FileCheck %s -check-prefix=GP64
; RUN: llc < %s -march=mips -mcpu=mips64 | FileCheck %s -check-prefix=GP64
; RUN: llc < %s -march=mips -mcpu=mips64r6 | FileCheck %s -check-prefix=GP64
declare void @bar(i32*)
define void @foo(i32 %sz) {
; ALL-LABEL: foo:
; M16-NOT: addiu $sp, 0 # 16 bit inst
; GP32-NOT: addiu $sp, $sp, 0
; GP64-NOT: daddiu $sp, $sp, 0
%a = alloca i32, i32 %sz
call void @bar(i32* %a)
ret void
}