[WebAssembly] Put __stack_pointer in the offset field of loads and stores.
Instead of this: i32.const $push10=, __stack_pointer i32.load $push11=, 0($pop10) Emit this: i32.const $push10=, 0 i32.load $push11=, __stack_pointer($pop10) It's not currently clear which is better, though there's a chance the second form may be better at overall compression. We can revisit this when we have more data; for now it makes sense to make PEI consistent with isel. Differential Revision: http://reviews.llvm.org/D20411 llvm-svn: 270635
This commit is contained in:
Dan Gohman
parent
a9f38983e8
commit
d530f68d45
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@ -87,18 +87,18 @@ static void writeSPToMemory(unsigned SrcReg, MachineFunction &MF,
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MachineRegisterInfo &MRI = MF.getRegInfo();
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const TargetRegisterClass *PtrRC =
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MRI.getTargetRegisterInfo()->getPointerRegClass(MF);
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unsigned SPAddr = MRI.createVirtualRegister(PtrRC);
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unsigned Zero = MRI.createVirtualRegister(PtrRC);
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unsigned Drop = MRI.createVirtualRegister(PtrRC);
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const auto *TII = MF.getSubtarget<WebAssemblySubtarget>().getInstrInfo();
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BuildMI(MBB, InsertAddr, DL, TII->get(WebAssembly::CONST_I32), SPAddr)
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.addExternalSymbol(SPSymbol);
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BuildMI(MBB, InsertAddr, DL, TII->get(WebAssembly::CONST_I32), Zero)
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.addImm(0);
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auto *MMO = new MachineMemOperand(MachinePointerInfo(MF.getPSVManager()
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.getExternalSymbolCallEntry(ES)),
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MachineMemOperand::MOStore, 4, 4);
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BuildMI(MBB, InsertStore, DL, TII->get(WebAssembly::STORE_I32), Drop)
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.addImm(0)
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.addReg(SPAddr)
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.addExternalSymbol(SPSymbol)
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.addReg(Zero)
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.addImm(2) // p2align
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.addReg(SrcReg)
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.addMemOperand(MMO);
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@ -137,20 +137,20 @@ void WebAssemblyFrameLowering::emitPrologue(MachineFunction &MF,
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const TargetRegisterClass *PtrRC =
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MRI.getTargetRegisterInfo()->getPointerRegClass(MF);
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unsigned SPAddr = MRI.createVirtualRegister(PtrRC);
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unsigned Zero = MRI.createVirtualRegister(PtrRC);
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unsigned SPReg = MRI.createVirtualRegister(PtrRC);
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const char *ES = "__stack_pointer";
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auto *SPSymbol = MF.createExternalSymbolName(ES);
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BuildMI(MBB, InsertPt, DL, TII->get(WebAssembly::CONST_I32), SPAddr)
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.addExternalSymbol(SPSymbol);
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BuildMI(MBB, InsertPt, DL, TII->get(WebAssembly::CONST_I32), Zero)
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.addImm(0);
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auto *LoadMMO = new MachineMemOperand(MachinePointerInfo(MF.getPSVManager()
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.getExternalSymbolCallEntry(ES)),
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MachineMemOperand::MOLoad, 4, 4);
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// Load the SP value.
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BuildMI(MBB, InsertPt, DL, TII->get(WebAssembly::LOAD_I32),
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StackSize ? SPReg : (unsigned)WebAssembly::SP32)
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.addImm(0) // offset
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.addReg(SPAddr) // addr
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.addExternalSymbol(SPSymbol)
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.addReg(Zero) // addr
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.addImm(2) // p2align
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.addMemOperand(LoadMMO);
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@ -23,14 +23,14 @@ declare void @ext_byval_func_empty(%EmptyStruct* byval)
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; CHECK-LABEL: byval_arg
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define void @byval_arg(%SmallStruct* %ptr) {
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; CHECK: .param i32
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; CHECK: i32.const $push[[L4:.+]]=, __stack_pointer
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; CHECK: i32.const $push[[L4:.+]]=, 0
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; Subtract 16 from SP (SP is 16-byte aligned)
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; CHECK: i32.const $push[[L1:.+]]=, __stack_pointer
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; CHECK-NEXT: i32.load $push[[L2:.+]]=, 0($pop[[L1]])
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; CHECK: i32.const $push[[L1:.+]]=, 0
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; CHECK-NEXT: i32.load $push[[L2:.+]]=, __stack_pointer($pop[[L1]])
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; CHECK-NEXT: i32.const $push[[L3:.+]]=, 16
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; CHECK-NEXT: i32.sub $push[[L10:.+]]=, $pop[[L2]], $pop[[L3]]
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; Ensure SP is stored back before the call
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; CHECK-NEXT: i32.store $push[[L12:.+]]=, 0($pop[[L4]]), $pop[[L10]]{{$}}
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; CHECK-NEXT: i32.store $push[[L12:.+]]=, __stack_pointer($pop[[L4]]), $pop[[L10]]{{$}}
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; CHECK-NEXT: tee_local $push[[L11:.+]]=, $[[SP:.+]]=, $pop[[L12]]{{$}}
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; Copy the SmallStruct argument to the stack (SP+12, original SP-4)
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; CHECK-NEXT: i32.load $push[[L0:.+]]=, 0($0)
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@ -41,10 +41,10 @@ define void @byval_arg(%SmallStruct* %ptr) {
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; CHECK-NEXT: call ext_byval_func@FUNCTION, $pop[[ARG]]{{$}}
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call void @ext_byval_func(%SmallStruct* byval %ptr)
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; Restore the stack
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; CHECK-NEXT: i32.const $push[[L7:.+]]=, __stack_pointer
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; CHECK-NEXT: i32.const $push[[L7:.+]]=, 0
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; CHECK-NEXT: i32.const $push[[L6:.+]]=, 16
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; CHECK-NEXT: i32.add $push[[L8:.+]]=, $[[SP]], $pop[[L6]]
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; CHECK-NEXT: i32.store {{.*}}=, 0($pop[[L7]]), $pop[[L8]]
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; CHECK-NEXT: i32.store {{.*}}=, __stack_pointer($pop[[L7]]), $pop[[L8]]
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; CHECK-NEXT: return
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ret void
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}
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@ -55,7 +55,7 @@ define void @byval_arg_align8(%SmallStruct* %ptr) {
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; Don't check the entire SP sequence, just enough to get the alignment.
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; CHECK: i32.const $push[[L1:.+]]=, 16
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; CHECK-NEXT: i32.sub $push[[L10:.+]]=, {{.+}}, $pop[[L1]]
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; CHECK-NEXT: i32.store $push[[L12:.+]]=, 0($pop{{.+}}), $pop[[L10]]{{$}}
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; CHECK-NEXT: i32.store $push[[L12:.+]]=, __stack_pointer($pop{{.+}}), $pop[[L10]]{{$}}
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; CHECK-NEXT: tee_local $push[[L11:.+]]=, $[[SP:.+]]=, $pop[[L12]]{{$}}
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; Copy the SmallStruct argument to the stack (SP+8, original SP-8)
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; CHECK-NEXT: i32.load $push[[L0:.+]]=, 0($0){{$}}
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@ -113,12 +113,12 @@ define void @byval_empty_callee(%EmptyStruct* byval %ptr) {
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; Call memcpy for "big" byvals.
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; CHECK-LABEL: big_byval:
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; CHECK: i32.const $push[[L4:.+]]=, __stack_pointer
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; CHECK: i32.const $push[[L1:.+]]=, __stack_pointer
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; CHECK-NEXT: i32.load $push[[L2:.+]]=, 0($pop[[L1]])
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; CHECK: i32.const $push[[L4:.+]]=, 0
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; CHECK: i32.const $push[[L1:.+]]=, 0
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; CHECK-NEXT: i32.load $push[[L2:.+]]=, __stack_pointer($pop[[L1]])
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; CHECK-NEXT: i32.const $push[[L3:.+]]=, 131072
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; CHECK-NEXT: i32.sub $push[[L8:.+]]=, $pop[[L2]], $pop[[L3]]
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; CHECK-NEXT: i32.store $push[[L12:.+]]=, 0($pop[[L4]]), $pop[[L8]]{{$}}
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; CHECK-NEXT: i32.store $push[[L12:.+]]=, __stack_pointer($pop[[L4]]), $pop[[L8]]{{$}}
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; CHECK-NEXT: i32.const $push[[L0:.+]]=, 131072
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; CHECK-NEXT: i32.call $push[[L11:.+]]=, memcpy@FUNCTION, $pop{{.+}}, ${{.+}}, $pop{{.+}}
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; CHECK-NEXT: tee_local $push[[L9:.+]]=, $[[SP:.+]]=, $pop[[L11]]{{$}}
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@ -449,8 +449,8 @@ bb10: ; preds = %bb9, %bb
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; CHECK-LABEL: stackpointer_dependency:
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; CHECK: call {{.+}}, stackpointer_callee@FUNCTION,
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; CHECK: i32.const $push[[L0:.+]]=, __stack_pointer
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; CHECK-NEXT: i32.store $drop=, 0($pop[[L0]]),
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; CHECK: i32.const $push[[L0:.+]]=, 0
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; CHECK-NEXT: i32.store $drop=, __stack_pointer($pop[[L0]]),
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declare i32 @stackpointer_callee(i8* readnone, i8* readnone)
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declare i8* @llvm.frameaddress(i32)
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define i32 @stackpointer_dependency(i8* readnone) {
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@ -10,29 +10,29 @@ declare void @ext_func_i32(i32* %ptr)
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; Check that there is an extra local for the stack pointer.
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; CHECK: .local i32{{$}}
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define void @alloca32() noredzone {
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; CHECK: i32.const $push[[L4:.+]]=, __stack_pointer{{$}}
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; CHECK: i32.const $push[[L1:.+]]=, __stack_pointer{{$}}
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; CHECK-NEXT: i32.load $push[[L2:.+]]=, 0($pop[[L1]])
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; CHECK: i32.const $push[[L4:.+]]=, 0{{$}}
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; CHECK: i32.const $push[[L1:.+]]=, 0{{$}}
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; CHECK-NEXT: i32.load $push[[L2:.+]]=, __stack_pointer($pop[[L1]])
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; CHECK-NEXT: i32.const $push[[L3:.+]]=, 16
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; CHECK-NEXT: i32.sub $push[[L8:.+]]=, $pop[[L2]], $pop[[L3]]
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; CHECK-NEXT: i32.store $push[[L10:.+]]=, 0($pop[[L4]]), $pop[[L8]]{{$}}
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; CHECK-NEXT: i32.store $push[[L10:.+]]=, __stack_pointer($pop[[L4]]), $pop[[L8]]{{$}}
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; CHECK-NEXT: tee_local $push[[L9:.+]]=, $[[SP:.+]]=, $pop[[L10]]{{$}}
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%retval = alloca i32
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; CHECK: i32.const $push[[L0:.+]]=, 0
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; CHECK: i32.store {{.*}}=, 12($pop[[L9]]), $pop[[L0]]
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store i32 0, i32* %retval
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; CHECK: i32.const $push[[L6:.+]]=, __stack_pointer
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; CHECK: i32.const $push[[L6:.+]]=, 0
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; CHECK-NEXT: i32.const $push[[L5:.+]]=, 16
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; CHECK-NEXT: i32.add $push[[L7:.+]]=, $[[SP]], $pop[[L5]]
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; CHECK-NEXT: i32.store $drop=, 0($pop[[L6]]), $pop[[L7]]
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; CHECK-NEXT: i32.store $drop=, __stack_pointer($pop[[L6]]), $pop[[L7]]
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ret void
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}
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; CHECK-LABEL: alloca3264:
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; CHECK: .local i32{{$}}
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define void @alloca3264() {
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; CHECK: i32.const $push[[L2:.+]]=, __stack_pointer
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; CHECK-NEXT: i32.load $push[[L3:.+]]=, 0($pop[[L2]])
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; CHECK: i32.const $push[[L2:.+]]=, 0{{$}}
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; CHECK-NEXT: i32.load $push[[L3:.+]]=, __stack_pointer($pop[[L2]])
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; CHECK-NEXT: i32.const $push[[L4:.+]]=, 16
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; CHECK-NEXT: i32.sub $push[[L6:.+]]=, $pop[[L3]], $pop[[L4]]
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; CHECK-NEXT: tee_local $push[[L5:.+]]=, $[[SP:.+]]=, $pop[[L6]]
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@ -51,12 +51,12 @@ define void @alloca3264() {
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; CHECK-LABEL: allocarray:
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; CHECK: .local i32{{$}}
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define void @allocarray() {
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; CHECK: i32.const $push[[L7:.+]]=, __stack_pointer
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; CHECK: i32.const $push[[L4:.+]]=, __stack_pointer
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; CHECK-NEXT: i32.load $push[[L5:.+]]=, 0($pop[[L4]])
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; CHECK: i32.const $push[[L7:.+]]=, 0{{$}}
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; CHECK: i32.const $push[[L4:.+]]=, 0{{$}}
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; CHECK-NEXT: i32.load $push[[L5:.+]]=, __stack_pointer($pop[[L4]])
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; CHECK-NEXT: i32.const $push[[L6:.+]]=, 144{{$}}
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; CHECK-NEXT: i32.sub $push[[L11:.+]]=, $pop[[L5]], $pop[[L6]]
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; CHECK-NEXT: i32.store ${{.+}}=, 0($pop[[L7]]), $pop[[L11]]
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; CHECK-NEXT: i32.store ${{.+}}=, __stack_pointer($pop[[L7]]), $pop[[L11]]
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%r = alloca [33 x i32]
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; CHECK: i32.const $push{{.+}}=, 24
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@ -69,10 +69,10 @@ define void @allocarray() {
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%p2 = getelementptr [33 x i32], [33 x i32]* %r, i32 0, i32 3
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store i32 1, i32* %p2
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; CHECK: i32.const $push[[L10:.+]]=, __stack_pointer
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; CHECK: i32.const $push[[L10:.+]]=, 0{{$}}
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; CHECK-NEXT: i32.const $push[[L8:.+]]=, 144
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; CHECK-NEXT: i32.add $push[[L19:.+]]=, $[[SP]], $pop[[L8]]
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; CHECK-NEXT: i32.store $drop=, 0($pop[[L10]]), $pop[[L9]]
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; CHECK-NEXT: i32.store $drop=, __stack_pointer($pop[[L10]]), $pop[[L9]]
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ret void
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}
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@ -106,12 +106,12 @@ define void @non_mem_use(i8** %addr) {
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; CHECK-LABEL: allocarray_inbounds:
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; CHECK: .local i32{{$}}
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define void @allocarray_inbounds() {
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; CHECK: i32.const $push[[L6:.+]]=, __stack_pointer
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; CHECK: i32.const $push[[L3:.+]]=, __stack_pointer
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; CHECK-NEXT: i32.load $push[[L4:.+]]=, 0($pop[[L3]])
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; CHECK: i32.const $push[[L6:.+]]=, 0{{$}}
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; CHECK: i32.const $push[[L3:.+]]=, 0{{$}}
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; CHECK-NEXT: i32.load $push[[L4:.+]]=, __stack_pointer($pop[[L3]])
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; CHECK-NEXT: i32.const $push[[L5:.+]]=, 32{{$}}
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; CHECK-NEXT: i32.sub $push[[L10:.+]]=, $pop[[L4]], $pop[[L5]]
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; CHECK-NEXT: i32.store ${{.+}}=, 0($pop[[L6]]), $pop[[L10]]{{$}}
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; CHECK-NEXT: i32.store ${{.+}}=, __stack_pointer($pop[[L6]]), $pop[[L10]]{{$}}
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%r = alloca [5 x i32]
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; CHECK: i32.const $push[[L3:.+]]=, 1
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; CHECK-DAG: i32.store $push{{.*}}=, 24(${{.+}}), $pop[[L3]]
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@ -122,36 +122,37 @@ define void @allocarray_inbounds() {
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%p2 = getelementptr inbounds [5 x i32], [5 x i32]* %r, i32 0, i32 3
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store i32 1, i32* %p2
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call void @ext_func(i64* null);
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; CHECK: i32.const $push[[L6:.+]]=, __stack_pointer
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; CHECK-NEXT: i32.const $push[[L5:.+]]=, 32
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; CHECK: call ext_func
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; CHECK: i32.const $push[[L6:.+]]=, 0{{$}}
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; CHECK-NEXT: i32.const $push[[L5:.+]]=, 32{{$}}
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; CHECK-NEXT: i32.add $push[[L7:.+]]=, ${{.+}}, $pop[[L5]]
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; CHECK-NEXT: i32.store $drop=, 0($pop[[L6]]), $pop[[L7]]
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; CHECK-NEXT: i32.store $drop=, __stack_pointer($pop[[L6]]), $pop[[L7]]
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ret void
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}
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; CHECK-LABEL: dynamic_alloca:
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define void @dynamic_alloca(i32 %alloc) {
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; CHECK: i32.const $push[[L7:.+]]=, __stack_pointer
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; CHECK: i32.const $push[[L1:.+]]=, __stack_pointer
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; CHECK-NEXT: i32.load $push[[L13:.+]]=, 0($pop[[L1]])
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; CHECK: i32.const $push[[L7:.+]]=, 0{{$}}
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; CHECK: i32.const $push[[L1:.+]]=, 0{{$}}
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; CHECK-NEXT: i32.load $push[[L13:.+]]=, __stack_pointer($pop[[L1]])
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; CHECK-NEXT: tee_local $push[[L12:.+]]=, [[SP:.+]], $pop[[L13]]{{$}}
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; Target independent codegen bumps the stack pointer.
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; CHECK: i32.sub
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; Check that SP is written back to memory after decrement
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; CHECK: i32.store $drop=, 0($pop{{.+}}),
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; CHECK: i32.store $drop=, __stack_pointer($pop{{.+}}),
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%r = alloca i32, i32 %alloc
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; Target-independent codegen also calculates the store addr
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; CHECK: call ext_func_i32@FUNCTION
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call void @ext_func_i32(i32* %r)
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; CHECK: i32.const $push[[L3:.+]]=, __stack_pointer
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; CHECK: i32.store $drop=, 0($pop[[L3]]), $pop{{.+}}
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; CHECK: i32.const $push[[L3:.+]]=, 0{{$}}
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; CHECK: i32.store $drop=, __stack_pointer($pop[[L3]]), $pop{{.+}}
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ret void
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}
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; CHECK-LABEL: dynamic_alloca_redzone:
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define void @dynamic_alloca_redzone(i32 %alloc) {
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; CHECK: i32.const $push[[L8:.+]]=, __stack_pointer
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; CHECK-NEXT: i32.load $push[[L13:.+]]=, 0($pop[[L1]])
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; CHECK: i32.const $push[[L8:.+]]=, 0{{$}}
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; CHECK-NEXT: i32.load $push[[L13:.+]]=, __stack_pointer($pop[[L1]])
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; CHECK-NEXT: tee_local $push[[L12:.+]]=, [[SP:.+]], $pop[[L13]]{{$}}
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; CHECK-NEXT: copy_local [[FP:.+]]=, $pop[[L12]]{{$}}
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; Target independent codegen bumps the stack pointer
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@ -169,18 +170,18 @@ define void @dynamic_alloca_redzone(i32 %alloc) {
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; CHECK-LABEL: dynamic_static_alloca:
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define void @dynamic_static_alloca(i32 %alloc) noredzone {
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; Decrement SP in the prolog by the static amount and writeback to memory.
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; CHECK: i32.const $push[[L7:.+]]=, __stack_pointer
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; CHECK: i32.const $push[[L8:.+]]=, __stack_pointer
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; CHECK: i32.const $push[[L9:.+]]=, __stack_pointer
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; CHECK-NEXT: i32.load $push[[L10:.+]]=, 0($pop[[L9]])
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; CHECK: i32.const $push[[L7:.+]]=, 0{{$}}
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; CHECK: i32.const $push[[L8:.+]]=, 0{{$}}
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; CHECK: i32.const $push[[L9:.+]]=, 0{{$}}
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; CHECK-NEXT: i32.load $push[[L10:.+]]=, __stack_pointer($pop[[L9]])
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; CHECK-NEXT: i32.const $push[[L11:.+]]=, 16
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; CHECK-NEXT: i32.sub $push[[L20:.+]]=, $pop[[L10]], $pop[[L11]]
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; CHECK-NEXT: tee_local $push[[L19:.+]]=, $[[FP:.+]]=, $pop[[L20]]
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; CHECK: i32.store $push[[L0:.+]]=, 0($pop{{.+}}), $pop{{.+}}
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; CHECK: i32.store $push[[L0:.+]]=, __stack_pointer($pop{{.+}}), $pop{{.+}}
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; Decrement SP in the body by the dynamic amount.
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; CHECK: i32.sub
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; Writeback to memory.
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; CHECK: i32.store $drop=, 0($pop{{.+}}), $pop{{.+}}
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; CHECK: i32.store $drop=, __stack_pointer($pop{{.+}}), $pop{{.+}}
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%r1 = alloca i32
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%r = alloca i32, i32 %alloc
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store i32 0, i32* %r
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@ -214,13 +215,13 @@ declare i8* @llvm.frameaddress(i32)
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; Test __builtin_frame_address(0).
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; CHECK-LABEL: frameaddress_0:
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; CHECK: i32.const $push[[L0:.+]]=, __stack_pointer
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; CHECK-NEXT: i32.load $push[[L3:.+]]=, 0($pop[[L0]])
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; CHECK: i32.const $push[[L0:.+]]=, 0{{$}}
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; CHECK-NEXT: i32.load $push[[L3:.+]]=, __stack_pointer($pop[[L0]])
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; CHECK-NEXT: copy_local $push[[L4:.+]]=, $pop[[L3]]{{$}}
|
||||
; CHECK-NEXT: tee_local $push[[L2:.+]]=, $[[FP:.+]]=, $pop[[L4]]{{$}}
|
||||
; CHECK-NEXT: call use_i8_star@FUNCTION, $pop[[L2]]
|
||||
; CHECK-NEXT: i32.const $push[[L1:.+]]=, __stack_pointer
|
||||
; CHECK-NEXT: i32.store $drop=, 0($pop[[L1]]), $[[FP]]
|
||||
; CHECK-NEXT: i32.const $push[[L1:.+]]=, 0{{$}}
|
||||
; CHECK-NEXT: i32.store $drop=, __stack_pointer($pop[[L1]]), $[[FP]]
|
||||
define void @frameaddress_0() {
|
||||
%t = call i8* @llvm.frameaddress(i32 0)
|
||||
call void @use_i8_star(i8* %t)
|
||||
|
|
|
|||
Loading…
Reference in New Issue