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[WebAssembly] Support combining GEP and FrameIndex offsets in memory operand offset field

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Previously we only supported putting the FI into memory operand offset
fields if there was nothing there already. Now combine them.

Differential Revision: http://reviews.llvm.org/D15941

llvm-svn: 257084
This commit is contained in:
Derek Schuff 2016-01-07 18:55:52 +00:00
parent cadd51d256
commit 03c784208d
2 changed files with 33 additions and 6 deletions
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18
lib/Target/WebAssembly/WebAssemblyRegisterInfo.cpp
View File

@ -61,17 +61,23 @@ void WebAssemblyRegisterInfo::eliminateFrameIndex(
MachineFunction &MF = *MBB.getParent();
int FrameIndex = MI.getOperand(FIOperandNum).getIndex();
const MachineFrameInfo& MFI = *MF.getFrameInfo();
int FrameOffset = MFI.getStackSize() + MFI.getObjectOffset(FrameIndex);
int64_t FrameOffset = MFI.getStackSize() + MFI.getObjectOffset(FrameIndex);
if (MI.mayLoadOrStore()) {
// If this is a load or store, make it relative to SP and fold the frame
// offset directly in
assert(MI.getOperand(1).getImm() == 0 &&
"Can't eliminate FI yet if offset is already set");
MI.getOperand(1).setImm(FrameOffset);
// offset directly in.
assert(FrameOffset >= 0 && MI.getOperand(1).getImm() >= 0);
int64_t Offset = MI.getOperand(1).getImm() + FrameOffset;
if (static_cast<uint64_t>(Offset) > std::numeric_limits<uint32_t>::max()) {
// If this happens the program is invalid, but better to error here than
// generate broken code.
report_fatal_error("Memory offset field overflow");
}
MI.getOperand(1).setImm(Offset);
MI.getOperand(2).ChangeToRegister(WebAssembly::SP32, /*IsDef=*/false);
} else {
// Otherwise create an i32.add SP, offset and make it the operand
// Otherwise create an i32.add SP, offset and make it the operand.
auto &MRI = MF.getRegInfo();
const auto *TII = MF.getSubtarget().getInstrInfo();

21
test/CodeGen/WebAssembly/userstack.ll
View File

@ -72,6 +72,27 @@ define void @allocarray() {
ret void
}
define void @allocarray_inbounds() {
; CHECK: i32.const [[L1:.+]]=, __stack_pointer
; CHECK-NEXT: i32.load [[L1]]=, 0([[L1]])
; CHECK-NEXT: i32.const [[L2:.+]]=, 32
; CHECK-NEXT: i32.sub [[SP:.+]]=, [[L1]], [[L2]]
%r = alloca [5 x i32]
; CHECK: i32.const $push[[L3:.+]]=, 1
; CHECK: i32.store {{.*}}=, 12([[SP]]), $pop[[L3]]
%p = getelementptr inbounds [5 x i32], [5 x i32]* %r, i32 0, i32 0
store i32 1, i32* %p
; This store should have both the GEP and the FI folded into it.
; CHECK-NEXT: i32.store {{.*}}=, 16([[SP]]), $pop
%p2 = getelementptr inbounds [5 x i32], [5 x i32]* %r, i32 0, i32 1
store i32 1, i32* %p2
; CHECK: i32.const [[L7:.+]]=, 32
; CHECK-NEXT: i32.add [[SP]]=, [[SP]], [[L7]]
; CHECK-NEXT: i32.const [[L8:.+]]=, __stack_pointer
; CHECK-NEXT: i32.store [[SP]]=, 0([[L7]]), [[SP]]
ret void
}
define void @dynamic_alloca(i32 %alloc) {
; TODO: Support frame pointers
;%r = alloca i32, i32 %alloc