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Also inflate register classes around inline asm.

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Now that MI->getRegClassConstraint() can also handle inline assembly,
don't bail when recomputing the register class of a virtual register
used by inline asm.

This fixes PR11078.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@141836 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen 2011-10-12 23:37:40 +00:00
parent f5916976e9
commit dee83c90bb
2 changed files with 28 additions and 4 deletions
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5
lib/CodeGen/MachineRegisterInfo.cpp
View File

@ -79,11 +79,8 @@ MachineRegisterInfo::recomputeRegClass(unsigned Reg, const TargetMachine &TM) {
// TRI doesn't have accurate enough information to model this yet.
if (I.getOperand().getSubReg())
return false;
// Inline asm instuctions don't remember their constraints.
if (I->isInlineAsm())
return false;
const TargetRegisterClass *OpRC =
TII->getRegClass(I->getDesc(), I.getOperandNo(), TRI);
I->getRegClassConstraint(I.getOperandNo(), TII, TRI);
if (OpRC)
NewRC = TRI->getCommonSubClass(NewRC, OpRC);
if (!NewRC || NewRC == OldRC)

27
test/CodeGen/X86/crash.ll
View File

@ -364,3 +364,30 @@ entry:
"5":
ret void
}
; PR11078
;
; A virtual register used by the "foo" inline asm memory operand gets
; constrained to GR32_ABCD during coalescing. This makes the inline asm
; impossible to allocate without splitting the live range and reinflating the
; register class around the inline asm.
;
; The constraint originally comes from the TEST8ri optimization of (icmp (and %t0, 1), 0).
@__force_order = external hidden global i32, align 4
define void @pr11078(i32* %pgd) nounwind {
entry:
%t0 = load i32* %pgd, align 4
%and2 = and i32 %t0, 1
%tobool = icmp eq i32 %and2, 0
br i1 %tobool, label %if.then, label %if.end
if.then:
%t1 = tail call i32 asm sideeffect "bar", "=r,=*m,~{dirflag},~{fpsr},~{flags}"(i32* @__force_order) nounwind
br label %if.end
if.end:
%t6 = inttoptr i32 %t0 to i64*
%t11 = tail call i64 asm sideeffect "foo", "=*m,=A,{bx},{cx},1,~{memory},~{dirflag},~{fpsr},~{flags}"(i64* %t6, i32 0, i32 0, i64 0) nounwind
ret void
}