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Handle cases where a register and one of its super-register are both marked as

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defined on the same instruction. This fixes PR1767.

llvm-svn: 43699
This commit is contained in:
Evan Cheng 2007-11-05 03:11:55 +00:00
parent bc39e175c4
commit e5eac2c5ac
2 changed files with 20 additions and 2 deletions
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6
lib/CodeGen/LiveVariables.cpp
View File

@ -203,7 +203,7 @@ bool LiveVariables::addRegisterKilled(unsigned IncomingReg, MachineInstr *MI,
RegInfo->isSuperRegister(IncomingReg, Reg) &&
MO.isKill())
// A super-register kill already exists.
return true;
Found = true;
}
}
@ -357,7 +357,9 @@ void LiveVariables::HandlePhysRegDef(unsigned Reg, MachineInstr *MI) {
} else if (PhysRegPartUse[Reg])
// Add implicit use / kill to last partial use.
addRegisterKilled(Reg, PhysRegPartUse[Reg], true);
else
else if (LastRef != MI)
// Defined, but not used. However, watch out for cases where a super-reg
// is also defined on the same MI.
addRegisterDead(Reg, LastRef);
}

16
test/CodeGen/X86/2007-11-04-LiveVariablesBug.ll Normal file
View File

@ -0,0 +1,16 @@
; RUN: llvm-as < %s | llc -mtriple=x86_64-unknown-linux-gnu
; PR1767
define void @xor_sse_2(i64 %bytes, i64* %p1, i64* %p2) {
entry:
%p2_addr = alloca i64* ; <i64**> [#uses=2]
%lines = alloca i32 ; <i32*> [#uses=2]
store i64* %p2, i64** %p2_addr, align 8
%tmp1 = lshr i64 %bytes, 8 ; <i64> [#uses=1]
%tmp12 = trunc i64 %tmp1 to i32 ; <i32> [#uses=2]
store i32 %tmp12, i32* %lines, align 4
%tmp6 = call i64* asm sideeffect "foo",
"=r,=*r,=*r,r,0,1,2,~{dirflag},~{fpsr},~{flags},~{memory}"( i64** %p2_addr,
i32* %lines, i64 256, i64* %p1, i64* %p2, i32 %tmp12 ) ; <i64*> [#uses=0]
ret void
}