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[ARM] Back up R4 and LR if calling the stack probe function

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Differential Revision: https://reviews.llvm.org/D46777

llvm-svn: 332298
This commit is contained in:
Martin Storsjo 2018-05-14 21:32:52 +00:00
parent 0b36643562
commit 0ceabcff5d
2 changed files with 12 additions and 1 deletions
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11
lib/Target/ARM/ARMFrameLowering.cpp
View File

@ -1620,6 +1620,17 @@ void ARMFrameLowering::determineCalleeSaves(MachineFunction &MF,
(MFI.hasVarSizedObjects() || RegInfo->needsStackRealignment(MF))) (MFI.hasVarSizedObjects() || RegInfo->needsStackRealignment(MF)))
SavedRegs.set(ARM::R4); SavedRegs.set(ARM::R4);
// If a stack probe will be emitted, spill R4 and LR, since they are
// clobbered by the stack probe call.
// This estimate should be a safe, conservative estimate. The actual
// stack probe is enabled based on the size of the local objects;
// this estimate also includes the varargs store size.
if (STI.isTargetWindows() &&
WindowsRequiresStackProbe(MF, MFI.estimateStackSize(MF))) {
SavedRegs.set(ARM::R4);
SavedRegs.set(ARM::LR);
}
if (AFI->isThumb1OnlyFunction()) { if (AFI->isThumb1OnlyFunction()) {
// Spill LR if Thumb1 function uses variable length argument lists. // Spill LR if Thumb1 function uses variable length argument lists.
if (AFI->getArgRegsSaveSize() > 0) if (AFI->getArgRegsSaveSize() > 0)

2
test/CodeGen/ARM/Windows/chkstk-movw-movt-isel.ll
View File

@ -18,7 +18,7 @@ entry:
} }
; CHECK-LABEL: isel ; CHECK-LABEL: isel
; CHECK: push {r4, r5} ; CHECK: push {r4, r5, r6, lr}
; CHECK: movw r12, #0 ; CHECK: movw r12, #0
; CHECK: movt r12, #0 ; CHECK: movt r12, #0
; CHECK: movw r4, #{{\d*}} ; CHECK: movw r4, #{{\d*}}