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[mips][FastISel] Implement FastMaterializeAlloca in Mips fast-isel. 

Summary: Implement the method FastMaterializeAlloca in Mips fast-isel

Based on a patch by Reed Kotler.

Test Plan:
Passes test-suite at O0/O2 for mips32 r1/r2
fastalloca.ll

Reviewers: dsanders, rkotler

Subscribers: rfuhler, llvm-commits

Differential Revision: http://reviews.llvm.org/D6742

llvm-svn: 235213
This commit is contained in:
Vasileios Kalintiris 2015-04-17 17:29:58 +00:00
parent 2be05eef31
commit 816ea84e7a
2 changed files with 52 additions and 0 deletions
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20
llvm/lib/Target/Mips/MipsFastISel.cpp
View File

@ -187,6 +187,7 @@ public:
UnsupportedFPMode = Subtarget->isFP64bit();
}
unsigned fastMaterializeAlloca(const AllocaInst *AI) override;
unsigned fastMaterializeConstant(const Constant *C) override;
bool fastSelectInstruction(const Instruction *I) override;
@ -253,6 +254,25 @@ unsigned MipsFastISel::emitLogicalOp(unsigned ISDOpc, MVT RetVT,
return ResultReg;
}
unsigned MipsFastISel::fastMaterializeAlloca(const AllocaInst *AI) {
assert(TLI.getValueType(AI->getType(), true) == MVT::i32 &&
"Alloca should always return a pointer.");
DenseMap<const AllocaInst *, int>::iterator SI =
FuncInfo.StaticAllocaMap.find(AI);
if (SI != FuncInfo.StaticAllocaMap.end()) {
unsigned ResultReg = createResultReg(&Mips::GPR32RegClass);
BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(Mips::LEA_ADDiu),
ResultReg)
.addFrameIndex(SI->second)
.addImm(0);
return ResultReg;
}
return 0;
}
unsigned MipsFastISel::materializeInt(const Constant *C, MVT VT) {
if (VT != MVT::i32 && VT != MVT::i16 && VT != MVT::i8 && VT != MVT::i1)
return 0;

32
llvm/test/CodeGen/Mips/Fast-ISel/fastalloca.ll Normal file
View File

@ -0,0 +1,32 @@
; RUN: llc -march=mipsel -relocation-model=pic -O0 -mips-fast-isel -fast-isel-abort=1 -mcpu=mips32r2 \
; RUN: < %s | FileCheck %s
%struct.x = type { i32 }
@i = common global i32 0, align 4
define i32 @foobar(i32 signext %x) {
entry:
; CHECK-LABEL: foobar:
%retval = alloca i32, align 4
%x.addr = alloca i32, align 4
%a = alloca %struct.x, align 4
%c = alloca %struct.x*, align 4
store i32 %x, i32* %x.addr, align 4
%x1 = getelementptr inbounds %struct.x, %struct.x* %a, i32 0, i32 0
%0 = load i32, i32* %x.addr, align 4
store i32 %0, i32* %x1, align 4
store %struct.x* %a, %struct.x** %c, align 4
%1 = load %struct.x*, %struct.x** %c, align 4
%x2 = getelementptr inbounds %struct.x, %struct.x* %1, i32 0, i32 0
%2 = load i32, i32* %x2, align 4
store i32 %2, i32* @i, align 4
%3 = load i32, i32* %retval
; CHECK-DAG: lw $[[I_ADDR:[0-9]+]], %got(i)($[[REG_GP:[0-9]+]])
; CHECK-DAG: addiu $[[A_ADDR:[0-9]+]], $sp, 8
; CHECK-DAG: sw $[[A_ADDR]], [[A_ADDR_FI:[0-9]+]]($sp)
; CHECK-DAG: lw $[[A_ADDR2:[0-9]+]], [[A_ADDR_FI]]($sp)
; CHECK-DAG: lw $[[A_X:[0-9]+]], 0($[[A_ADDR2]])
; CHECK-DAG: sw $[[A_X]], 0($[[I_ADDR]])
ret i32 %3
}