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
103 lines
3.2 KiB
ArmAsm
103 lines
3.2 KiB
ArmAsm
// This test checks that the unwinding opcodes are remapped to more
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// efficient ones where possible.
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// RUN: llvm-mc -triple aarch64-pc-win32 -filetype=obj %s -o %t.o
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// RUN: llvm-readobj -u %t.o | FileCheck %s
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// CHECK: UnwindInformation [
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// CHECK-NEXT: RuntimeFunction {
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// CHECK-NEXT: Function: func
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// CHECK-NEXT: ExceptionRecord: .xdata
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// CHECK-NEXT: ExceptionData {
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// CHECK: Prologue [
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// CHECK-NEXT: 0xd882 ; stp d10, d11, [sp, #16]
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// CHECK-NEXT: 0xda07 ; stp d8, d9, [sp, #-64]!
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// CHECK-NEXT: 0xe6 ; save next
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// CHECK-NEXT: 0x28 ; stp x19, x20, [sp, #-64]!
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// CHECK-NEXT: 0xca49 ; stp x28, x29, [sp, #72]
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// CHECK-NEXT: 0xe6 ; save next
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// CHECK-NEXT: 0xe6 ; save next
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// CHECK-NEXT: 0xe6 ; save next
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// CHECK-NEXT: 0xcc47 ; stp x20, x21, [sp, #-64]!
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// CHECK-NEXT: 0x42 ; stp x29, x30, [sp, #16]
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// CHECK-NEXT: 0xca02 ; stp x27, x28, [sp, #16]
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// CHECK-NEXT: 0x83 ; stp x29, x30, [sp, #-32]!
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// CHECK-NEXT: 0xce03 ; stp x27, x28, [sp, #-32]!
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// CHECK-NEXT: 0xe1 ; mov fp, sp
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// CHECK-NEXT: 0xe201 ; add fp, sp, #8
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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: 0xc904 ; ldp x23, x24, [sp, #32]
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// CHECK-NEXT: 0xe6 ; restore next
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// CHECK-NEXT: 0xcc83 ; ldp x21, x22, [sp], #32
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// CHECK-NEXT: 0x24 ; ldp x19, x20, [sp], #32
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// CHECK-NEXT: 0xcc1f ; ldp x19, x20, [sp], #256
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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-NEXT: }
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// CHECK-NEXT: ]
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.text
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.globl func
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.seh_proc func
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func:
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add x29, sp, #8
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.seh_add_fp 8
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add x29, sp, #0
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.seh_add_fp 0
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stp x27, x28, [sp, #-32]!
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.seh_save_regp_x x27, 32
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stp x29, x30, [sp, #-32]!
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.seh_save_regp_x x29, 32
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stp x27, x28, [sp, #16]
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.seh_save_regp x27, 16
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stp x29, x30, [sp, #16]
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.seh_save_regp x29, 16
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stp x20, x21, [sp, #-64]!
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.seh_save_regp_x x20, 64
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stp x22, x23, [sp, #16]
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.seh_save_regp x22, 16
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stp x24, x25, [sp, #32]
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.seh_save_next
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stp x26, x27, [sp, #48]
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.seh_save_regp x26, 48
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stp x28, x29, [sp, #72]
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.seh_save_regp x28, 72
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stp x19, x20, [sp, #-64]!
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.seh_save_r19r20_x 64
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stp x21, x22, [sp, #16]
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.seh_save_regp x21, 16
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stp d8, d9, [sp, #-64]!
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.seh_save_fregp_x d8, 64
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stp d10, d11, [sp, #16]
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// This is intentionally not converted into a save_next, to avoid
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// bugs in the windows unwinder.
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.seh_save_fregp d10, 16
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.seh_endprologue
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nop
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.seh_startepilogue
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ldp x27, x28, [sp, #32]
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.seh_save_regp x23, 32
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ldp x23, x24, [sp, #16]
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.seh_save_regp x23, 16
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ldp x21, x22, [sp], #32
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.seh_save_regp_x x21, 32
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ldp x19, x20, [sp], #32
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.seh_save_regp_x x19, 32
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ldp x19, x20, [sp], #256
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.seh_save_regp_x x19, 256
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.seh_endepilogue
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ret
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.seh_endproc
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