cabefea2ec
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
151 lines
6.4 KiB
YAML
151 lines
6.4 KiB
YAML
# RUN: llc -o - %s -mtriple=aarch64-windows -start-after=prologepilog -filetype=obj \
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# RUN: | llvm-readobj --unwind - | FileCheck %s
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# RUN: llc -o - %s -mtriple=aarch64-windows -run-pass=aarch64-ldst-opt \
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# RUN: | FileCheck %s --check-prefix=CHECK-LDSTOPT
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# This test case checks the basic validity of the .xdata section. It's
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# documented at:
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# https://docs.microsoft.com/en-us/cpp/build/arm64-exception-handling
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# Also test the generated assembler SEH directives.
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# RUN: llc -o - %s -mtriple=aarch64-windows -start-after=prologepilog -filetype=asm \
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# RUN: | FileCheck %s --check-prefix=ASM
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# We expect to see the following in the .xdata section:
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# CHECK: ExceptionData {
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# CHECK-NEXT: FunctionLength: 96
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# CHECK-NEXT: Version: 0
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# CHECK-NEXT: ExceptionData: No
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# CHECK-NEXT: EpiloguePacked: Yes
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# CHECK-NEXT: EpilogueOffset: 13
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# CHECK-NEXT: ByteCodeLength: 28
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# CHECK-NEXT: Prologue [
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# CHECK-NEXT: 0xc808 ; stp x19, x20, [sp, #64]
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# CHECK-NEXT: 0xd0c7 ; str x22, [sp, #56]
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# CHECK-NEXT: 0xd086 ; str x21, [sp, #48]
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# CHECK-NEXT: 0xc904 ; stp x23, x24, [sp, #32]
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# CHECK-NEXT: 0xc982 ; stp x25, x26, [sp, #16]
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# CHECK-NEXT: 0xce09 ; stp x27, x28, [sp, #-80]!
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# CHECK-NEXT: 0xe4 ; end
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# CHECK-NEXT: ]
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# CHECK-NEXT: Epilogue [
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# CHECK-NEXT: 0xc808 ; ldp x19, x20, [sp, #64]
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# CHECK-NEXT: 0xd086 ; ldr x21, [sp, #48]
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# CHECK-NEXT: 0xe3 ; nop
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# CHECK-NEXT: 0xd0c7 ; ldr x22, [sp, #56]
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# CHECK-NEXT: 0xc904 ; ldp x23, x24, [sp, #32]
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# CHECK-NEXT: 0xc982 ; ldp x25, x26, [sp, #16]
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# CHECK-NEXT: 0xce09 ; ldp x27, x28, [sp], #80
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# CHECK-NEXT: 0xe4 ; end
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# CHECK-NEXT: ]
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# CHECK-NEXT: }
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# Check that the load-store optimizer does not merge the two
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# callee-saved stores in the prologue.
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# CHECK-LDSTOPT: name: test
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# CHECK-LDSTOPT: frame-setup STRXui killed $x21, $sp, 6
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# CHECK-LDSTOPT: frame-setup STRXui killed $x22, $sp, 7
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# ASM-LABEL: test:
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# ASM: .seh_proc test
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# ASM: .seh_save_regp_x x27, 80
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# ASM: .seh_save_regp x25, 16
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# ASM: .seh_save_regp x23, 32
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# ASM: .seh_save_reg x21, 48
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# ASM: .seh_save_reg x22, 56
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# ASM: .seh_save_regp x19, 64
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# ASM: .seh_endprologue
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# ASM: .seh_startepilogue
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# ASM: .seh_save_regp x19, 64
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# ASM: .seh_save_reg x21, 48
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# ASM: .seh_nop
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# ASM: .seh_save_reg x22, 56
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# ASM: .seh_save_regp x23, 32
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# ASM: .seh_save_regp x25, 16
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# ASM: .seh_save_regp_x x27, 80
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# ASM: .seh_endepilogue
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# ASM: .seh_endfunclet
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# ASM: .seh_endproc
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...
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---
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name: test
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alignment: 4
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tracksRegLiveness: true
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hasWinCFI: true
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liveins:
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- { reg: '$w0' }
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frameInfo:
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stackSize: 80
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maxAlignment: 8
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maxCallFrameSize: 0
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hasOpaqueSPAdjustment: true
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stack:
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- { id: 0, type: spill-slot, offset: -8, size: 8, alignment: 8, stack-id: default,
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callee-saved-register: '$x19' }
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- { id: 1, type: spill-slot, offset: -16, size: 8, alignment: 8, stack-id: default,
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callee-saved-register: '$x20' }
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- { id: 2, type: spill-slot, offset: -24, size: 8, alignment: 8, stack-id: default,
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callee-saved-register: '$x21' }
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- { id: 3, type: spill-slot, offset: -32, size: 8, alignment: 8, stack-id: default,
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callee-saved-register: '$x22' }
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- { id: 4, type: spill-slot, offset: -40, size: 8, alignment: 8, stack-id: default,
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callee-saved-register: '$x23' }
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- { id: 5, type: spill-slot, offset: -48, size: 8, alignment: 8, stack-id: default,
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callee-saved-register: '$x24' }
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- { id: 6, type: spill-slot, offset: -56, size: 8, alignment: 8, stack-id: default,
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callee-saved-register: '$x25' }
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- { id: 7, type: spill-slot, offset: -64, size: 8, alignment: 8, stack-id: default,
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callee-saved-register: '$x26' }
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- { id: 8, type: spill-slot, offset: -72, size: 8, alignment: 8, stack-id: default,
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callee-saved-register: '$x27' }
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- { id: 9, type: spill-slot, offset: -80, size: 8, alignment: 8, stack-id: default,
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callee-saved-register: '$x28' }
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body: |
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bb.0.entry:
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liveins: $x0, $x1, $x27, $x28, $x25, $x26, $x23, $x24, $x21, $x22, $x19, $x20
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early-clobber $sp = frame-setup STPXpre killed $x27, killed $x28, $sp, -10 :: (store (s64) into %stack.8), (store (s64) into %stack.9)
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frame-setup SEH_SaveRegP_X 27, 28, -80
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frame-setup STPXi killed $x25, killed $x26, $sp, 2 :: (store (s64) into %stack.6), (store (s64) into %stack.7)
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frame-setup SEH_SaveRegP 25, 26, 16
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frame-setup STPXi killed $x23, killed $x24, $sp, 4 :: (store (s64) into %stack.4), (store (s64) into %stack.5)
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frame-setup SEH_SaveRegP 23, 24, 32
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frame-setup STRXui killed $x21, $sp, 6 :: (store (s64) into %stack.2)
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frame-setup SEH_SaveReg 21, 48
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frame-setup STRXui killed $x22, $sp, 7 :: (store (s64) into %stack.3)
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frame-setup SEH_SaveReg 22, 56
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frame-setup STPXi killed $x19, killed $x20, $sp, 8 :: (store (s64) into %stack.0), (store (s64) into %stack.1)
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frame-setup SEH_SaveRegP 19, 20, 64
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frame-setup SEH_PrologEnd
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$x19 = ADDXrr $x0, killed $x1
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$x20 = ADDXrr $x19, killed $x0
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$x21 = ADDXrr $x20, killed $x19
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$x22 = ADDXrr $x21, killed $x20
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$x23 = ADDXrr $x22, killed $x21
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$x24 = ADDXrr $x23, killed $x22
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$x25 = ADDXrr $x24, killed $x23
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$x26 = ADDXrr $x25, killed $x24
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$x27 = ADDXrr $x26, killed $x25
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$x28 = ADDXrr $x27, killed $x26
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frame-destroy SEH_EpilogStart
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$x19, $x20 = frame-destroy LDPXi $sp, 8 :: (load (s64) from %stack.0), (load (s64) from %stack.1)
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frame-destroy SEH_SaveRegP 19, 20, 64
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$x21 = frame-destroy LDRXui $sp, 6 :: (load (s64) from %stack.2)
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frame-destroy SEH_SaveReg 21, 48
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$x0 = COPY $x28
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frame-destroy SEH_Nop
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$x21 = frame-destroy LDRXui $sp, 6 :: (load (s64) from %stack.2)
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frame-destroy SEH_SaveReg 22, 56
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$x23, $x24 = frame-destroy LDPXi $sp, 4 :: (load (s64) from %stack.4), (load (s64) from %stack.5)
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frame-destroy SEH_SaveRegP 23, 24, 32
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$x25, $x26 = frame-destroy LDPXi $sp, 2 :: (load (s64) from %stack.6), (load (s64) from %stack.7)
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frame-destroy SEH_SaveRegP 25, 26, 16
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early-clobber $sp, $x27, $x28 = frame-destroy LDPXpost $sp, 10 :: (load (s64) from %stack.8), (load (s64) from %stack.9)
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frame-destroy SEH_SaveRegP_X 27, 28, -80
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frame-destroy SEH_EpilogEnd
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RET_ReallyLR implicit $x0
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...
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