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fix rdar://9297006 - fast isel bails out on trunc to i1 -> bools cry,

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a common cause of fast isel rejects on c++ code.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@129748 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2011-04-19 04:22:17 +00:00
parent 75b41f1540
commit 90cb88a9b4
2 changed files with 46 additions and 6 deletions
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35
lib/Target/X86/X86FastISel.cpp
View File

@ -865,12 +865,9 @@ bool X86FastISel::X86SelectCmp(const Instruction *I) {
unsigned NEReg = createResultReg(&X86::GR8RegClass);
unsigned PReg = createResultReg(&X86::GR8RegClass);
BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
TII.get(X86::SETNEr), NEReg);
BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
TII.get(X86::SETPr), PReg);
BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
TII.get(X86::OR8rr), ResultReg)
BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, TII.get(X86::SETNEr), NEReg);
BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, TII.get(X86::SETPr), PReg);
BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, TII.get(X86::OR8rr),ResultReg)
.addReg(PReg).addReg(NEReg);
UpdateValueMap(I, ResultReg);
return true;
@ -1068,6 +1065,32 @@ bool X86FastISel::X86SelectBranch(const Instruction *I) {
}
}
}
} else if (TruncInst *TI = dyn_cast<TruncInst>(BI->getCondition())) {
// Handle things like "%cond = trunc i32 %X to i1 / br i1 %cond", which
// typically happen for _Bool and C++ bools.
MVT SourceVT;
if (TI->hasOneUse() && TI->getParent() == I->getParent() &&
isTypeLegal(TI->getOperand(0)->getType(), SourceVT)) {
unsigned TestOpc = 0;
switch (SourceVT.SimpleTy) {
default: break;
case MVT::i8: TestOpc = X86::TEST8ri; break;
case MVT::i16: TestOpc = X86::TEST16ri; break;
case MVT::i32: TestOpc = X86::TEST32ri; break;
case MVT::i64: TestOpc = X86::TEST64ri32; break;
}
if (TestOpc) {
unsigned OpReg = getRegForValue(TI->getOperand(0));
if (OpReg == 0) return false;
BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, TII.get(TestOpc))
.addReg(OpReg).addImm(1);
BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, TII.get(X86::JNE_4))
.addMBB(TrueMBB);
FastEmitBranch(FalseMBB, DL);
FuncInfo.MBB->addSuccessor(TrueMBB);
return true;
}
}
}
// Otherwise do a clumsy setcc and re-test it.

17
test/CodeGen/X86/fast-isel-x86-64.ll
View File

@ -127,3 +127,20 @@ define i32 @test11(i32 %X) nounwind {
; CHECK: sarl $3,
}
; rdar://9297006 - Trunc to bool.
define void @test12(i8 %tmp) nounwind ssp noredzone {
entry:
%tobool = trunc i8 %tmp to i1
br i1 %tobool, label %if.then, label %if.end
if.then: ; preds = %entry
call void @test12(i8 0) noredzone
br label %if.end
if.end: ; preds = %if.then, %entry
ret void
; CHECK: test12:
; CHECK: testb $1,
}