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clang-p2996/llvm/test/CodeGen/AArch64/wineh2.mir
Martin Storsjö cabefea2ec [MC] [Win64EH] Try writing an ARM64 "packed epilog" even if the epilog doesn't share opcodes with the prolog 
The "packed epilog" form only implies that the epilog is located
exactly at the end of the function (so the location of the epilog
is implicit from the epilog opcodes), but it doesn't have to share
opcodes with the prolog - as long as the total number of opcode
bytes and the offset to the epilog fit within the bitfields.

This avoids writing a 4 byte epilog scope in many cases. (I haven't
measured how much this shrinks actual xdata sections in practice
though.)

Differential Revision: https://reviews.llvm.org/D125536
2022-05-17 00:41:39 +03:00

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# RUN: llc -o - %s -mtriple=aarch64-windows -start-after=prologepilog \
# RUN: -filetype=obj | llvm-readobj --unwind - | FileCheck %s
# Test that the pre/post increment save of a flating point register is correct.
# CHECK: ExceptionData {
# CHECK-NEXT: FunctionLength: 144
# CHECK-NEXT: Version: 0
# CHECK-NEXT: ExceptionData: No
# CHECK-NEXT: EpiloguePacked: Yes
# CHECK-NEXT: EpilogueOffset: 19
# CHECK-NEXT: ByteCodeLength: 40
# CHECK-NEXT: Prologue [
# CHECK-NEXT: 0xc80e ; stp x19, x20, [sp, #112]
# CHECK-NEXT: 0xc88c ; stp x21, x22, [sp, #96]
# CHECK-NEXT: 0xc90a ; stp x23, x24, [sp, #80]
# CHECK-NEXT: 0xc988 ; stp x25, x26, [sp, #64]
# CHECK-NEXT: 0xca06 ; stp x27, x28, [sp, #48]
# CHECK-NEXT: 0xdc45 ; str d9, [sp, #40]
# CHECK-NEXT: 0xdc04 ; str d8, [sp, #32]
# CHECK-NEXT: 0xd882 ; stp d10, d11, [sp, #16]
# CHECK-NEXT: 0xde8f ; str d12, [sp, #-128]!
# CHECK-NEXT: 0xe4 ; end
# CHECK-NEXT: ]
# CHECK-NEXT: Epilogue [
# CHECK-NEXT: 0xc80e ; ldp x19, x20, [sp, #112]
# CHECK-NEXT: 0xc88c ; ldp x21, x22, [sp, #96]
# CHECK-NEXT: 0xc90a ; ldp x23, x24, [sp, #80]
# CHECK-NEXT: 0xc988 ; ldp x25, x26, [sp, #64]
# CHECK-NEXT: 0xca06 ; ldp x27, x28, [sp, #48]
# CHECK-NEXT: 0xdc04 ; ldr d8, [sp, #32]
# CHECK-NEXT: 0xdc45 ; ldr d9, [sp, #40]
# CHECK-NEXT: 0xd882 ; ldp d10, d11, [sp, #16]
# CHECK-NEXT: 0xde8f ; ldr d12, [sp], #128
# CHECK-NEXT: 0xe4 ; end
# CHECK-NEXT: ]
# CHECK-NEXT: }
...
---
name: test
alignment: 4
exposesReturnsTwice: false
legalized: false
regBankSelected: false
selected: false
failedISel: false
tracksRegLiveness: true
hasWinCFI: true
registers:
liveins:
- { reg: '$w0', virtual-reg: '' }
frameInfo:
isFrameAddressTaken: false
isReturnAddressTaken: false
hasStackMap: false
hasPatchPoint: false
stackSize: 128
offsetAdjustment: 0
maxAlignment: 16
adjustsStack: false
hasCalls: false
stackProtector: ''
maxCallFrameSize: 0
hasOpaqueSPAdjustment: true
hasVAStart: false
hasMustTailInVarArgFunc: false
localFrameSize: 0
savePoint: ''
restorePoint: ''
fixedStack:
stack:
- { id: 0, name: '', type: spill-slot, offset: -8, size: 8, alignment: 8,
stack-id: default, callee-saved-register: '$x19', callee-saved-restored: true,
debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
- { id: 1, name: '', type: spill-slot, offset: -16, size: 8, alignment: 8,
stack-id: default, callee-saved-register: '$x20', callee-saved-restored: true,
debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
- { id: 2, name: '', type: spill-slot, offset: -24, size: 8, alignment: 8,
stack-id: default, callee-saved-register: '$x21', callee-saved-restored: true,
debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
- { id: 3, name: '', type: spill-slot, offset: -32, size: 8, alignment: 8,
stack-id: default, callee-saved-register: '$x22', callee-saved-restored: true,
debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
- { id: 4, name: '', type: spill-slot, offset: -40, size: 8, alignment: 8,
stack-id: default, callee-saved-register: '$x23', callee-saved-restored: true,
debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
- { id: 5, name: '', type: spill-slot, offset: -48, size: 8, alignment: 8,
stack-id: default, callee-saved-register: '$x24', callee-saved-restored: true,
debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
- { id: 6, name: '', type: spill-slot, offset: -56, size: 8, alignment: 8,
stack-id: default, callee-saved-register: '$x25', callee-saved-restored: true,
debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
- { id: 7, name: '', type: spill-slot, offset: -64, size: 8, alignment: 8,
stack-id: default, callee-saved-register: '$x26', callee-saved-restored: true,
debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
- { id: 8, name: '', type: spill-slot, offset: -72, size: 8, alignment: 8,
stack-id: default, callee-saved-register: '$x27', callee-saved-restored: true,
debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
- { id: 9, name: '', type: spill-slot, offset: -80, size: 8, alignment: 8,
stack-id: default, callee-saved-register: '$x28', callee-saved-restored: true,
debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
- { id: 10, name: '', type: spill-slot, offset: -88, size: 8, alignment: 8,
stack-id: default, callee-saved-register: '$d8', callee-saved-restored: true,
debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
- { id: 11, name: '', type: spill-slot, offset: -96, size: 8, alignment: 8,
stack-id: default, callee-saved-register: '$d9', callee-saved-restored: true,
debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
- { id: 12, name: '', type: spill-slot, offset: -104, size: 8, alignment: 8,
stack-id: default, callee-saved-register: '$d10', callee-saved-restored: true,
debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
- { id: 13, name: '', type: spill-slot, offset: -112, size: 8, alignment: 8,
stack-id: default, callee-saved-register: '$d11', callee-saved-restored: true,
debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
- { id: 14, name: '', type: spill-slot, offset: -128, size: 8, alignment: 16,
stack-id: default, callee-saved-register: '$d12', callee-saved-restored: true,
debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
constants:
body: |
bb.0.entry:
liveins: $x0, $x1, $d0, $d1, $d8, $d9, $d10, $d11, $d12, $x19, $x20, $x21, $x22, $x23, $x24, $x25, $x26, $x27, $x28
early-clobber $sp = frame-setup STRDpre killed $d12, $sp, -128 :: (store (s64) into %stack.14)
frame-setup SEH_SaveFReg_X 12, -128
frame-setup STPDi killed $d10, killed $d11, $sp, 2 :: (store (s64) into %stack.12), (store (s64) into %stack.13)
frame-setup SEH_SaveFRegP 10, 11, 16
frame-setup STRDui killed $d8, $sp, 4 :: (store (s64) into %stack.10)
frame-setup SEH_SaveFReg 8, 32
frame-setup STRDui killed $d9, $sp, 5 :: (store (s64) into %stack.11)
frame-setup SEH_SaveFReg 9, 40
frame-setup STPXi killed $x27, killed $x28, $sp, 6 :: (store (s64) into %stack.8), (store (s64) into %stack.9)
frame-setup SEH_SaveRegP 27, 28, 48
frame-setup STPXi killed $x25, killed $x26, $sp, 8 :: (store (s64) into %stack.6), (store (s64) into %stack.7)
frame-setup SEH_SaveRegP 25, 26, 64
frame-setup STPXi killed $x23, killed $x24, $sp, 10 :: (store (s64) into %stack.4), (store (s64) into %stack.5)
frame-setup SEH_SaveRegP 23, 24, 80
frame-setup STPXi killed $x21, killed $x22, $sp, 12 :: (store (s64) into %stack.2), (store (s64) into %stack.3)
frame-setup SEH_SaveRegP 21, 22, 96
frame-setup STPXi killed $x19, killed $x20, $sp, 14 :: (store (s64) into %stack.0), (store (s64) into %stack.1)
frame-setup SEH_SaveRegP 19, 20, 112
frame-setup SEH_PrologEnd
$x19 = ADDXrr $x0, killed $x1
$d8 = FADDDrr killed $d0, $d1
$d9 = FADDDrr $d8, $d1
$d10 = FADDDrr $d9, $d8
$d11 = FADDDrr killed $d9, $d10
$d12 = FADDDrr killed $d10, killed $d11
$x20 = ADDXrr $x19, killed $x0
$x21 = ADDXrr $x20, killed $x19
$x22 = ADDXrr $x21, killed $x20
$x23 = ADDXrr $x22, killed $x21
$x24 = ADDXrr $x23, killed $x22
$x25 = ADDXrr $x24, killed $x23
$x26 = ADDXrr $x25, killed $x24
$x27 = ADDXrr $x26, killed $x25
$x28 = ADDXrr $x27, killed $x26
$x0 = COPY $d12
$x0 = ADDXrr $x0, killed $x28
frame-destroy SEH_EpilogStart
$x19, $x20 = frame-destroy LDPXi $sp, 14 :: (load (s64) from %stack.0), (load (s64) from %stack.1)
frame-destroy SEH_SaveRegP 19, 20, 112
$x21, $x22 = frame-destroy LDPXi $sp, 12 :: (load (s64) from %stack.2), (load (s64) from %stack.3)
frame-destroy SEH_SaveRegP 21, 22, 96
$x23, $x24 = frame-destroy LDPXi $sp, 10 :: (load (s64) from %stack.4), (load (s64) from %stack.5)
frame-destroy SEH_SaveRegP 23, 24, 80
$x25, $x26 = frame-destroy LDPXi $sp, 8 :: (load (s64) from %stack.6), (load (s64) from %stack.7)
frame-destroy SEH_SaveRegP 25, 26, 64
$x27, $x28 = frame-destroy LDPXi $sp, 6 :: (load (s64) from %stack.8), (load (s64) from %stack.9)
frame-destroy SEH_SaveRegP 27, 28, 48
$d8 = frame-destroy LDRDui $sp, 4 :: (load (s64) from %stack.10)
frame-destroy SEH_SaveFReg 8, 32
$d9 = frame-destroy LDRDui $sp, 5 :: (load (s64) from %stack.11)
frame-destroy SEH_SaveFReg 9, 40
$d10, $d11 = frame-destroy LDPDi $sp, 2 :: (load (s64) from %stack.12), (load (s64) from %stack.13)
frame-destroy SEH_SaveFRegP 10, 11, 16
early-clobber $sp, $d12 = frame-destroy LDRDpost $sp, 128 :: (load (s64) from %stack.14)
frame-destroy SEH_SaveFReg_X 12, -128
frame-destroy SEH_EpilogEnd
RET_ReallyLR implicit $x0
...
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