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Revert "[AArch64][SVE] Allow accesses to SVE stack objects to use frame pointer"
This patch introduced codegen faults. An attempt to fix this was done in https://reviews.llvm.org/D97193, but ultimately it was decided to approach this differently. This reverts commit 42635856ed3c9a05957640f9deb50cf865c03825. Differential Revision: https://reviews.llvm.org/D98350
This commit is contained in:
Bradley Smith
parent
fbfc30d1ae
commit
142ffc8786
@ -352,7 +352,6 @@ bool AArch64FrameLowering::canUseRedZone(const MachineFunction &MF) const {
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/// pointer register.
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bool AArch64FrameLowering::hasFP(const MachineFunction &MF) const {
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const MachineFrameInfo &MFI = MF.getFrameInfo();
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const AArch64FunctionInfo *AFI = MF.getInfo<AArch64FunctionInfo>();
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const TargetRegisterInfo *RegInfo = MF.getSubtarget().getRegisterInfo();
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// Win64 EH requires a frame pointer if funclets are present, as the locals
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// are accessed off the frame pointer in both the parent function and the
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@ -377,14 +376,6 @@ bool AArch64FrameLowering::hasFP(const MachineFunction &MF) const {
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if (!MFI.isMaxCallFrameSizeComputed() ||
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MFI.getMaxCallFrameSize() > DefaultSafeSPDisplacement)
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return true;
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// If there are both SVE and non-SVE objects on the stack, make the frame
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// pointer available since it may be more performant to use it.
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uint64_t CalleeStackSize = AFI->isCalleeSavedStackSizeComputed()
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? AFI->getCalleeSavedStackSize()
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: 0;
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uint64_t NonSVEStackSize = MFI.getStackSize() - CalleeStackSize;
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if (AFI->getStackSizeSVE() && NonSVEStackSize)
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return true;
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return false;
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}
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@ -1980,6 +1971,10 @@ StackOffset AArch64FrameLowering::resolveFrameOffsetReference(
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// right thing for the emergency spill slot.
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bool UseFP = false;
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if (AFI->hasStackFrame() && !isSVE) {
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// We shouldn't prefer using the FP when there is an SVE area
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// in between the FP and the non-SVE locals/spills.
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PreferFP &= !SVEStackSize;
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// Note: Keeping the following as multiple 'if' statements rather than
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// merging to a single expression for readability.
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//
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@ -2000,10 +1995,6 @@ StackOffset AArch64FrameLowering::resolveFrameOffsetReference(
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bool FPOffsetFits = !ForSimm || FPOffset >= -256;
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PreferFP |= Offset > -FPOffset;
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// The FP offset will not fit if there is an SVE area in the way.
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if (SVEStackSize && FPOffset < 0)
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FPOffsetFits = false;
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if (MFI.hasVarSizedObjects()) {
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// If we have variable sized objects, we can use either FP or BP, as the
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// SP offset is unknown. We can use the base pointer if we have one and
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@ -248,10 +248,6 @@ public:
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return getCalleeSavedStackSize();
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}
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bool isCalleeSavedStackSizeComputed() const {
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return HasCalleeSavedStackSize;
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}
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unsigned getCalleeSavedStackSize() const {
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assert(HasCalleeSavedStackSize &&
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"CalleeSavedStackSize has not been calculated");
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@ -12,16 +12,16 @@
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# CHECK1: : DW_OP_breg31 WSP+16)
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# CHECK1: DW_AT_type {{.*}}ty32
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#
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# CHECK2: : DW_OP_breg29 W29+0, DW_OP_lit8, DW_OP_bregx VG+0, DW_OP_mul, DW_OP_minus)
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# CHECK2: : DW_OP_breg31 WSP+16, DW_OP_lit16, DW_OP_bregx VG+0, DW_OP_mul, DW_OP_plus)
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# CHECK2: DW_AT_type {{.*}}svint32_t
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#
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# CHECK3: : DW_OP_breg29 W29+0, DW_OP_lit16, DW_OP_bregx VG+0, DW_OP_mul, DW_OP_minus)
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# CHECK3: : DW_OP_breg31 WSP+16, DW_OP_lit8, DW_OP_bregx VG+0, DW_OP_mul, DW_OP_plus)
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# CHECK3: DW_AT_type {{.*}}svint32_t
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#
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# CHECK4: : DW_OP_breg29 W29+0, DW_OP_lit17, DW_OP_bregx VG+0, DW_OP_mul, DW_OP_minus)
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# CHECK4: : DW_OP_breg31 WSP+16, DW_OP_lit7, DW_OP_bregx VG+0, DW_OP_mul, DW_OP_plus)
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# CHECK4: DW_AT_type {{.*}}svbool_t
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#
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# CHECK5: : DW_OP_breg29 W29+0, DW_OP_lit18, DW_OP_bregx VG+0, DW_OP_mul, DW_OP_minus)
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# CHECK5: : DW_OP_breg31 WSP+16, DW_OP_lit6, DW_OP_bregx VG+0, DW_OP_mul, DW_OP_plus)
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# CHECK5: DW_AT_type {{.*}}svbool_t
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--- |
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@ -57,7 +57,6 @@
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# CHECK: bb.0.entry:
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# CHECK-NEXT: $sp = frame-setup STRXpre killed $[[SCRATCH:[a-z0-9]+]], $sp, -16
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# CHECK-NEXT: $fp = frame-setup ADDXri $sp, 0, 0
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# CHECK-NEXT: $sp = frame-setup ADDVL_XXI $sp, -2
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# CHECK-NEXT: $sp = frame-setup SUBXri $sp, 16, 0
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# CHECK-COUNT-2: frame-setup CFI_INSTRUCTION
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@ -68,9 +67,11 @@
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# CHECK-NEXT: RET_ReallyLR
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# ASM-LABEL: test_allocate_sve:
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# ASM: .cfi_offset w29, -16
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# ASM: .cfi_escape 0x0f, 0x0c, 0x8f, 0x00, 0x11, 0x20, 0x22, 0x11, 0x10, 0x92, 0x2e, 0x00, 0x1e, 0x22 // sp + 32 + 16 * VG
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# ASM-NEXT: .cfi_offset w29, -16
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#
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# UNWINDINFO: DW_CFA_offset: reg29 -16
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# UNWINDINFO: DW_CFA_def_cfa_expression: DW_OP_breg31 +0, DW_OP_consts +32, DW_OP_plus, DW_OP_consts +16, DW_OP_bregx 0x2e +0, DW_OP_mul, DW_OP_plus
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# UNWINDINFO-NEXT: DW_CFA_offset: reg29 -16
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name: test_allocate_sve
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stack:
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- { id: 0, stack-id: scalable-vector, size: 18, alignment: 2 }
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@ -95,7 +96,6 @@ body: |
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# CHECK: bb.0.entry:
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# CHECK-NEXT: $sp = frame-setup STRXpre killed $[[SCRATCH:[a-z0-9]+]], $sp, -32
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# CHECK-NEXT: frame-setup STPXi killed $x21, killed $x20, $sp, 2
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# CHECK-NEXT: $fp = frame-setup ADDXri $sp, 0, 0
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# CHECK-NEXT: $sp = frame-setup ADDVL_XXI $sp, -2
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# CHECK-NEXT: $sp = frame-setup SUBXri $sp, 16, 0
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# CHECK-COUNT-4: frame-setup CFI_INSTRUCTION
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@ -109,11 +109,13 @@ body: |
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# CHECK-NEXT: RET_ReallyLR
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#
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# ASM-LABEL: test_allocate_sve_gpr_callee_saves:
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# ASM: .cfi_offset w20, -8
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# ASM: .cfi_escape 0x0f, 0x0c, 0x8f, 0x00, 0x11, 0x30, 0x22, 0x11, 0x10, 0x92, 0x2e, 0x00, 0x1e, 0x22 // sp + 48 + 16 * VG
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# ASM-NEXT: .cfi_offset w20, -8
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# ASM-NEXT: .cfi_offset w21, -16
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# ASM-NEXT: .cfi_offset w29, -32
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#
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# UNWINDINFO: DW_CFA_offset: reg20 -8
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# UNWINDINFO: DW_CFA_def_cfa_expression: DW_OP_breg31 +0, DW_OP_consts +48, DW_OP_plus, DW_OP_consts +16, DW_OP_bregx 0x2e +0, DW_OP_mul, DW_OP_plus
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# UNWINDINFO-NEXT: DW_CFA_offset: reg20 -8
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# UNWINDINFO-NEXT: DW_CFA_offset: reg21 -16
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# UNWINDINFO-NEXT: DW_CFA_offset: reg29 -32
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name: test_allocate_sve_gpr_callee_saves
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@ -182,14 +184,16 @@ body: |
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# CHECK: bb.0.entry:
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# CHECK-NEXT: $sp = frame-setup STRXpre killed $[[SCRATCH:[a-z0-9]+]], $sp, -16
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# CHECK-NEXT: $fp = frame-setup ADDXri $sp, 0, 0
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# CHECK-NEXT: $sp = frame-setup ADDVL_XXI $sp, -3
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# CHECK-NEXT: $sp = frame-setup SUBXri $sp, 16, 0
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# CHECK-COUNT-2: frame-setup CFI_INSTRUCTION
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# CHECK-NEXT: STR_ZXI $z0, $fp, -1
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# CHECK-NEXT: STR_ZXI $z1, $fp, -2
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# CHECK-NEXT: STR_PXI $p0, $fp, -17
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# CHECK-NEXT: $[[TMP:x[0-9]+]] = ADDXri $sp, 16
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# CHECK-NEXT: STR_ZXI $z0, killed $[[TMP]], 2
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# CHECK-NEXT: $[[TMP:x[0-9]+]] = ADDXri $sp, 16
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# CHECK-NEXT: STR_ZXI $z1, killed $[[TMP]], 1
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# CHECK-NEXT: $[[TMP:x[0-9]+]] = ADDXri $sp, 16
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# CHECK-NEXT: STR_PXI $p0, killed $[[TMP]], 7
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# CHECK-NEXT: $sp = frame-destroy ADDVL_XXI $sp, 3
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# CHECK-NEXT: $sp = frame-destroy ADDXri $sp, 16, 0
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@ -197,9 +201,11 @@ body: |
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# CHECK-NEXT: RET_ReallyLR
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#
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# ASM-LABEL: test_address_sve:
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# ASM: .cfi_offset w29, -16
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# ASM: .cfi_escape 0x0f, 0x0c, 0x8f, 0x00, 0x11, 0x20, 0x22, 0x11, 0x18, 0x92, 0x2e, 0x00, 0x1e, 0x22 // sp + 32 + 24 * VG
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# ASM-NEXT: .cfi_offset w29, -16
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#
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# UNWINDINFO: DW_CFA_offset: reg29 -16
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# UNWINDINFO: DW_CFA_def_cfa_expression: DW_OP_breg31 +0, DW_OP_consts +32, DW_OP_plus, DW_OP_consts +24, DW_OP_bregx 0x2e +0, DW_OP_mul, DW_OP_plus
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# UNWINDINFO-NEXT: DW_CFA_offset: reg29 -16
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name: test_address_sve
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frameInfo:
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@ -292,12 +298,12 @@ body: |
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# CHECK: bb.0.entry:
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# CHECK-NEXT: $sp = frame-setup STRXpre killed $[[SCRATCH:[a-z0-9]+]], $sp, -16
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# CHECK-NEXT: $fp = frame-setup ADDXri $sp, 0, 0
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# CHECK-NEXT: $sp = frame-setup ADDVL_XXI $sp, -1
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# CHECK-NEXT: $sp = frame-setup SUBXri $sp, 16, 0
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# CHECK-COUNT-2: frame-setup CFI_INSTRUCTION
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# CHECK-NEXT: $x0 = LDRXui $fp, 2
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# CHECK: $[[TMP:x[0-9]+]] = ADDVL_XXI $sp, 1
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# CHECK-NEXT: $x0 = LDRXui killed $[[TMP]], 4
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# CHECK-NEXT: $sp = frame-destroy ADDVL_XXI $sp, 1
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# CHECK-NEXT: $sp = frame-destroy ADDXri $sp, 16, 0
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@ -305,9 +311,11 @@ body: |
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# CHECK-NEXT: RET_ReallyLR
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#
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# ASM-LABEL: test_stack_arg_sve:
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# ASM: .cfi_offset w29, -16
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# ASM: .cfi_escape 0x0f, 0x0c, 0x8f, 0x00, 0x11, 0x20, 0x22, 0x11, 0x08, 0x92, 0x2e, 0x00, 0x1e, 0x22 // sp + 32 + 8 * VG
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# ASM-NEXT: .cfi_offset w29, -16
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#
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# UNWINDINFO: DW_CFA_offset: reg29 -16
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# UNWINDINFO: DW_CFA_def_cfa_expression: DW_OP_breg31 +0, DW_OP_consts +32, DW_OP_plus, DW_OP_consts +8, DW_OP_bregx 0x2e +0, DW_OP_mul, DW_OP_plus
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# UNWINDINFO-NEXT: DW_CFA_offset: reg29 -16
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name: test_stack_arg_sve
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fixedStack:
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@ -452,9 +460,11 @@ body: |
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# CHECK: RET_ReallyLR
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#
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# ASM-LABEL: save_restore_pregs_sve:
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# ASM: .cfi_offset w29, -16
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# ASM: .cfi_escape 0x0f, 0x0c, 0x8f, 0x00, 0x11, 0x30, 0x22, 0x11, 0x08, 0x92, 0x2e, 0x00, 0x1e, 0x22 // sp + 48 + 8 * VG
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# ASM-NEXT: .cfi_offset w29, -16
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#
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# UNWINDINFO: DW_CFA_offset: reg29 -16
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# UNWINDINFO: DW_CFA_def_cfa_expression: DW_OP_breg31 +0, DW_OP_consts +48, DW_OP_plus, DW_OP_consts +8, DW_OP_bregx 0x2e +0, DW_OP_mul, DW_OP_plus
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# UNWINDINFO-NEXT: DW_CFA_offset: reg29 -16
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name: save_restore_pregs_sve
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stack:
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- { id: 0, stack-id: default, size: 32, alignment: 16 }
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@ -470,7 +480,6 @@ body: |
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...
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# CHECK-LABEL: name: save_restore_zregs_sve
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# CHECK: $sp = frame-setup STRXpre killed $fp, $sp, -16
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# CHECK-NEXT: $fp = frame-setup ADDXri $sp, 0, 0
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# CHECK-NEXT: $sp = frame-setup ADDVL_XXI $sp, -3
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# CHECK-NEXT: frame-setup STR_ZXI killed $z10, $sp, 0
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# CHECK-NEXT: frame-setup STR_ZXI killed $z9, $sp, 1
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@ -487,11 +496,13 @@ body: |
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# CHECK-NEXT: RET_ReallyLR
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#
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# ASM-LABEL: save_restore_zregs_sve:
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# ASM: .cfi_escape 0x10, 0x48, 0x0a, 0x11, 0x70, 0x22, 0x11, 0x78, 0x92, 0x2e, 0x00, 0x1e, 0x22 // $d8 @ cfa - 16 - 8 * VG
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# ASM: .cfi_escape 0x0f, 0x0c, 0x8f, 0x00, 0x11, 0x30, 0x22, 0x11, 0x18, 0x92, 0x2e, 0x00, 0x1e, 0x22 // sp + 48 + 24 * VG
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# ASM-NEXT: .cfi_escape 0x10, 0x48, 0x0a, 0x11, 0x70, 0x22, 0x11, 0x78, 0x92, 0x2e, 0x00, 0x1e, 0x22 // $d8 @ cfa - 16 - 8 * VG
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# ASM-NEXT: .cfi_escape 0x10, 0x49, 0x0a, 0x11, 0x70, 0x22, 0x11, 0x70, 0x92, 0x2e, 0x00, 0x1e, 0x22 // $d9 @ cfa - 16 - 16 * VG
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# ASM-NEXT: .cfi_escape 0x10, 0x4a, 0x0a, 0x11, 0x70, 0x22, 0x11, 0x68, 0x92, 0x2e, 0x00, 0x1e, 0x22 // $d10 @ cfa - 16 - 24 * VG
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# UNWINDINFO: DW_CFA_expression: reg72 DW_OP_consts -16, DW_OP_plus, DW_OP_consts -8, DW_OP_bregx 0x2e +0, DW_OP_mul, DW_OP_plus
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# UNWINDINFO: DW_CFA_def_cfa_expression: DW_OP_breg31 +0, DW_OP_consts +48, DW_OP_plus, DW_OP_consts +24, DW_OP_bregx 0x2e +0, DW_OP_mul, DW_OP_plus
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# UNWINDINFO-NEXT: DW_CFA_expression: reg72 DW_OP_consts -16, DW_OP_plus, DW_OP_consts -8, DW_OP_bregx 0x2e +0, DW_OP_mul, DW_OP_plus
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# UNWINDINFO-NEXT: DW_CFA_expression: reg73 DW_OP_consts -16, DW_OP_plus, DW_OP_consts -16, DW_OP_bregx 0x2e +0, DW_OP_mul, DW_OP_plus
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# UNWINDINFO-NEXT: DW_CFA_expression: reg74 DW_OP_consts -16, DW_OP_plus, DW_OP_consts -24, DW_OP_bregx 0x2e +0, DW_OP_mul, DW_OP_plus
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# UNWINDINFO-NEXT: DW_CFA_offset: reg29 -16
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@ -547,7 +558,8 @@ body: |
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# CHECK: RET_ReallyLR
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#
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# ASM-LABEL: save_restore_sve:
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# ASM: .cfi_escape 0x10, 0x48, 0x0a, 0x11, 0x60, 0x22, 0x11, 0x78, 0x92, 0x2e, 0x00, 0x1e, 0x22 // $d8 @ cfa - 32 - 8 * VG
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# ASM: .cfi_escape 0x0f, 0x0e, 0x8f, 0x00, 0x11, 0xc0, 0x00, 0x22, 0x11, 0x98, 0x01, 0x92, 0x2e, 0x00, 0x1e, 0x22 // sp + 64 + 152 * VG
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# ASM-NEXT: .cfi_escape 0x10, 0x48, 0x0a, 0x11, 0x60, 0x22, 0x11, 0x78, 0x92, 0x2e, 0x00, 0x1e, 0x22 // $d8 @ cfa - 32 - 8 * VG
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# ASM-NEXT: .cfi_escape 0x10, 0x49, 0x0a, 0x11, 0x60, 0x22, 0x11, 0x70, 0x92, 0x2e, 0x00, 0x1e, 0x22 // $d9 @ cfa - 32 - 16 * VG
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# ASM-NEXT: .cfi_escape 0x10, 0x4a, 0x0a, 0x11, 0x60, 0x22, 0x11, 0x68, 0x92, 0x2e, 0x00, 0x1e, 0x22 // $d10 @ cfa - 32 - 24 * VG
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# ASM-NEXT: .cfi_escape 0x10, 0x4b, 0x0a, 0x11, 0x60, 0x22, 0x11, 0x60, 0x92, 0x2e, 0x00, 0x1e, 0x22 // $d11 @ cfa - 32 - 32 * VG
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@ -560,7 +572,8 @@ body: |
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# ASM-NEXT: .cfi_offset w21, -24
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# ASM-NEXT: .cfi_offset w29, -32
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#
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# UNWINDINFO: DW_CFA_expression: reg72 DW_OP_consts -32, DW_OP_plus, DW_OP_consts -8, DW_OP_bregx 0x2e +0, DW_OP_mul, DW_OP_plus
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# UNWINDINFO: DW_CFA_def_cfa_expression: DW_OP_breg31 +0, DW_OP_consts +64, DW_OP_plus, DW_OP_consts +152, DW_OP_bregx 0x2e +0, DW_OP_mul, DW_OP_plus
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# UNWINDINFO-NEXT: DW_CFA_expression: reg72 DW_OP_consts -32, DW_OP_plus, DW_OP_consts -8, DW_OP_bregx 0x2e +0, DW_OP_mul, DW_OP_plus
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# UNWINDINFO-NEXT: DW_CFA_expression: reg73 DW_OP_consts -32, DW_OP_plus, DW_OP_consts -16, DW_OP_bregx 0x2e +0, DW_OP_mul, DW_OP_plus
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# UNWINDINFO-NEXT: DW_CFA_expression: reg74 DW_OP_consts -32, DW_OP_plus, DW_OP_consts -24, DW_OP_bregx 0x2e +0, DW_OP_mul, DW_OP_plus
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# UNWINDINFO-NEXT: DW_CFA_expression: reg75 DW_OP_consts -32, DW_OP_plus, DW_OP_consts -32, DW_OP_bregx 0x2e +0, DW_OP_mul, DW_OP_plus
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@ -41,18 +41,15 @@ define float @foo2(double* %x0, double* %x1) nounwind {
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; CHECK-LABEL: foo2:
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; CHECK: // %bb.0: // %entry
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; CHECK-NEXT: stp x29, x30, [sp, #-16]! // 16-byte Folded Spill
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; CHECK-NEXT: mov x29, sp
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; CHECK-NEXT: addvl sp, sp, #-4
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; CHECK-NEXT: sub sp, sp, #16 // =16
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; CHECK-NEXT: ptrue p0.b
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; CHECK-NEXT: ld4d { z1.d, z2.d, z3.d, z4.d }, p0/z, [x0]
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; CHECK-NEXT: ld4d { z16.d, z17.d, z18.d, z19.d }, p0/z, [x1]
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; CHECK-NEXT: ptrue p0.d
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; CHECK-NEXT: addvl x8, x29, #-4
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; CHECK-NEXT: add x8, sp, #16 // =16
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; CHECK-NEXT: add x9, sp, #16 // =16
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; CHECK-NEXT: fmov s0, #1.00000000
|
||||
; CHECK-NEXT: st1d { z16.d }, p0, [x29, #-4, mul vl]
|
||||
; CHECK-NEXT: st1d { z17.d }, p0, [x8, #1, mul vl]
|
||||
; CHECK-NEXT: st1d { z18.d }, p0, [x8, #2, mul vl]
|
||||
; CHECK-NEXT: st1d { z19.d }, p0, [x8, #3, mul vl]
|
||||
; CHECK-NEXT: mov w1, #1
|
||||
; CHECK-NEXT: mov w2, #2
|
||||
; CHECK-NEXT: mov w3, #3
|
||||
@ -60,8 +57,12 @@ define float @foo2(double* %x0, double* %x1) nounwind {
|
||||
; CHECK-NEXT: mov w5, #5
|
||||
; CHECK-NEXT: mov w6, #6
|
||||
; CHECK-NEXT: mov w7, #7
|
||||
; CHECK-NEXT: str x8, [sp, #-16]!
|
||||
; CHECK-NEXT: mov w0, wzr
|
||||
; CHECK-NEXT: st1d { z16.d }, p0, [x9]
|
||||
; CHECK-NEXT: st1d { z17.d }, p0, [x8, #1, mul vl]
|
||||
; CHECK-NEXT: st1d { z18.d }, p0, [x8, #2, mul vl]
|
||||
; CHECK-NEXT: st1d { z19.d }, p0, [x8, #3, mul vl]
|
||||
; CHECK-NEXT: str x8, [sp]
|
||||
; CHECK-NEXT: bl callee2
|
||||
; CHECK-NEXT: addvl sp, sp, #4
|
||||
; CHECK-NEXT: add sp, sp, #16 // =16
|
||||
|
||||
Loading…
Reference in New Issue
Block a user