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Struct byval: use the correct alignment for loads generated to load

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from struct byval to registers.

We used to pass 0 which means the alignment of PtrVT. Even when the alignment
of the struct is smaller than 4, the LOADs would have alignment of 4, and
further optimizations could combine the LOADs into a ldm, which would
cause crash.

The fix is to pass the alignment of the struct byval.

rdar://problem/15144402


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@192126 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Manman Ren 2013-10-07 19:47:53 +00:00
parent 116189a997
commit fb92f46459
2 changed files with 29 additions and 1 deletions
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3
lib/Target/ARM/ARMISelLowering.cpp
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@ -1570,7 +1570,8 @@ ARMTargetLowering::LowerCall(TargetLowering::CallLoweringInfo &CLI,
SDValue AddArg = DAG.getNode(ISD::ADD, dl, PtrVT, Arg, Const);
SDValue Load = DAG.getLoad(PtrVT, dl, Chain, AddArg,
MachinePointerInfo(),
false, false, false, 0);
false, false, false,
DAG.InferPtrAlignment(AddArg));
MemOpChains.push_back(Load.getValue(1));
RegsToPass.push_back(std::make_pair(j, Load));
}

27
test/CodeGen/ARM/byval_load_align.ll Normal file
View File

@ -0,0 +1,27 @@
; RUN: llc < %s -mtriple thumbv7-apple-ios -O1 | FileCheck %s
; rdar://15144402
; Make sure we don't assume 4-byte alignment when loading from a byval argument
; with alignment of 2.
; CHECK: ldr r1, [r[[REG:[0-9]+]]]
; CHECK: ldr r2, [r[[REG]], #4]
; CHECK: ldr r3, [r[[REG]], #8]
; CHECK-NOT: ldm
; CHECK: .align 1 @ @sID
%struct.ModuleID = type { [32 x i8], [32 x i8], i16 }
@sID = internal constant %struct.ModuleID { [32 x i8] c"TEST\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00", [32 x i8] c"1.0\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00", i16 23 }, align 2
; Function Attrs: nounwind ssp
define void @Client() #0 {
entry:
tail call void @Logger(i8 signext 97, %struct.ModuleID* byval @sID) #2
ret void
}
declare void @Logger(i8 signext, %struct.ModuleID* byval) #1
attributes #0 = { nounwind ssp "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
attributes #1 = { "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
attributes #2 = { nounwind }