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Handle i1/i8/i16 constant integer arguments to calls by prepromoting them.

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Before we would bail out on i1 arguments all together, now we just bail on
non-constant ones.  Also, we used to emit extraneous code.  e.g. test12 was:

	movb	$0, %al
	movzbl	%al, %edi
	callq	_test12

and test13 was:
	movb	$0, %al
	xorl	%edi, %edi
	movb	%al, 7(%rsp)
	callq	_test13f

Now we get:

	movl	$0, %edi
	callq	_test12
and:
	movl	$0, %edi
	callq	_test13f



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@129751 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2011-04-19 04:42:38 +00:00
parent c76d121807
commit e03b8d3162
2 changed files with 34 additions and 10 deletions
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31
lib/Target/X86/X86FastISel.cpp
View File

@ -1457,8 +1457,7 @@ bool X86FastISel::X86SelectCall(const Instruction *I) {
// Handle only C and fastcc calling conventions for now.
ImmutableCallSite CS(CI);
CallingConv::ID CC = CS.getCallingConv();
if (CC != CallingConv::C &&
CC != CallingConv::Fast &&
if (CC != CallingConv::C && CC != CallingConv::Fast &&
CC != CallingConv::X86_FastCall)
return false;
@ -1517,9 +1516,7 @@ bool X86FastISel::X86SelectCall(const Instruction *I) {
ArgFlags.reserve(CS.arg_size());
for (ImmutableCallSite::arg_iterator i = CS.arg_begin(), e = CS.arg_end();
i != e; ++i) {
unsigned Arg = getRegForValue(*i);
if (Arg == 0)
return false;
Value *ArgVal = *i;
ISD::ArgFlagsTy Flags;
unsigned AttrInd = i - CS.arg_begin() + 1;
if (CS.paramHasAttr(AttrInd, Attribute::SExt))
@ -1527,6 +1524,23 @@ bool X86FastISel::X86SelectCall(const Instruction *I) {
if (CS.paramHasAttr(AttrInd, Attribute::ZExt))
Flags.setZExt();
// If this is an i1/i8/i16 argument, promote to i32 to avoid an extra
// instruction. This is safe because it is common to all fastisel supported
// calling conventions on x86.
if (ConstantInt *CI = dyn_cast<ConstantInt>(ArgVal)) {
if (CI->getBitWidth() == 1 || CI->getBitWidth() == 8 ||
CI->getBitWidth() == 16) {
if (Flags.isSExt())
ArgVal = ConstantExpr::getSExt(CI,Type::getInt32Ty(CI->getContext()));
else
ArgVal = ConstantExpr::getZExt(CI,Type::getInt32Ty(CI->getContext()));
}
}
unsigned Arg = getRegForValue(ArgVal);
if (Arg == 0)
return false;
// FIXME: Only handle *easy* calls for now.
if (CS.paramHasAttr(AttrInd, Attribute::InReg) ||
CS.paramHasAttr(AttrInd, Attribute::StructRet) ||
@ -1534,7 +1548,7 @@ bool X86FastISel::X86SelectCall(const Instruction *I) {
CS.paramHasAttr(AttrInd, Attribute::ByVal))
return false;
const Type *ArgTy = (*i)->getType();
const Type *ArgTy = ArgVal->getType();
MVT ArgVT;
if (!isTypeLegal(ArgTy, ArgVT))
return false;
@ -1542,7 +1556,7 @@ bool X86FastISel::X86SelectCall(const Instruction *I) {
Flags.setOrigAlign(OriginalAlignment);
Args.push_back(Arg);
ArgVals.push_back(*i);
ArgVals.push_back(ArgVal);
ArgVTs.push_back(ArgVT);
ArgFlags.push_back(Flags);
}
@ -1552,9 +1566,8 @@ bool X86FastISel::X86SelectCall(const Instruction *I) {
CCState CCInfo(CC, false, TM, ArgLocs, I->getParent()->getContext());
// Allocate shadow area for Win64
if (Subtarget->isTargetWin64()) {
if (Subtarget->isTargetWin64())
CCInfo.AllocateStack(32, 8);
}
CCInfo.AnalyzeCallOperands(ArgVTs, ArgFlags, CC_X86);

13
test/CodeGen/X86/fast-isel-x86-64.ll
View File

@ -143,6 +143,17 @@ if.end: ; preds = %if.then, %entry
; CHECK: test12:
; CHECK: testb $1,
; CHECK-NEXT: je L
; CHECK-NEXT: movb $0, %al
; CHECK-NEXT: movl $0, %edi
; CHECK-NEXT: callq
}
declare void @test13f(i1 %X)
define void @test13() nounwind {
call void @test13f(i1 0)
ret void
; CHECK: test13:
; CHECK: movl $0, %edi
; CHECK-NEXT: callq
}