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Compute the correct jump table entries on 32 bit windows.

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On 32 bit windows we use label differences and .set does not suppress
rolocations, a combination that was not used before r220256.

This fixes PR21497.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@221456 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Rafael Espindola 2014-11-06 14:39:49 +00:00
parent f0f66a254d
commit eed959015b
2 changed files with 39 additions and 2 deletions
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5
lib/CodeGen/AsmPrinter/AsmPrinter.cpp
View File

@ -1247,8 +1247,9 @@ void AsmPrinter::EmitJumpTableEntry(const MachineJumpTableInfo *MJTI,
break;
}
Value = MCSymbolRefExpr::Create(MBB->getSymbol(), OutContext);
const MCExpr *JTI = MCSymbolRefExpr::Create(GetJTISymbol(UID), OutContext);
Value = MCBinaryExpr::CreateSub(Value, JTI, OutContext);
const TargetLowering *TLI = TM.getSubtargetImpl()->getTargetLowering();
const MCExpr *Base = TLI->getPICJumpTableRelocBaseExpr(MF, UID, OutContext);
Value = MCBinaryExpr::CreateSub(Value, Base, OutContext);
break;
}
}

36
test/CodeGen/X86/win32-pic-jumptable.ll Normal file
View File

@ -0,0 +1,36 @@
; RUN: llc < %s -relocation-model=pic | FileCheck %s
; CHECK: calll L0$pb
; CHECK-NEXT: L0$pb:
; CHECK-NEXT: popl %eax
; CHECK-NEXT: addl LJTI0_0(,%ecx,4), %eax
; CHECK-NEXT: jmpl *%eax
; CHECK: LJTI0_0:
; CHECK-NEXT: .long LBB0_4-L0$pb
; CHECK-NEXT: .long LBB0_5-L0$pb
; CHECK-NEXT: .long LBB0_6-L0$pb
; CHECK-NEXT: .long LBB0_7-L0$pb
target triple = "i686--windows-itanium"
define i32 @f(i64 %x) {
bb0:
switch i64 %x, label %bb5 [
i64 1, label %bb1
i64 2, label %bb2
i64 3, label %bb3
i64 4, label %bb4
]
bb1:
br label %bb5
bb2:
br label %bb5
bb3:
br label %bb5
bb4:
br label %bb5
bb5:
%y = phi i32 [ 0, %bb0 ], [ 1, %bb1 ], [ 2, %bb2 ], [ 3, %bb3 ], [ 4, %bb4 ]
ret i32 %y
}