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llvm-project/llvm/test/CodeGen/AArch64/streaming-compatible-memory-ops.ll
Benjamin Maxwell 478b4b012f
[AArch64][SME] Rework VG CFI information for streaming-mode changes (#152283) 
This patch reworks how VG is handled around streaming mode changes.

Previously, for functions with streaming mode changes, we would:

- Save the incoming VG in the prologue
- Emit `.cfi_offset vg, <offset>` and `.cfi_restore vg` around streaming
  mode changes

Additionally, for locally streaming functions, we would:

- Also save the streaming VG in the prologue
- Emit `.cfi_offset vg, <incoming VG offset>` in the prologue
- Emit `.cfi_offset vg, <streaming VG offset>` and `.cfi_restore vg`
  around streaming mode changes

In both cases, this ends up doing more than necessary and would be hard
for an unwinder to parse, as using `.cfi_offset` in this way does not
follow the semantics of the underlying DWARF CFI opcodes.

So the new scheme in this patch is to:

In functions with streaming mode changes (inc locally streaming)

- Save the incoming VG in the prologue
- Emit `.cfi_offset vg, <offset>` in the prologue (not at streaming mode
  changes)
- Emit `.cfi_restore vg` after the saved VG has been deallocated 
- This will be in the function epilogue, where VG is always the same as
  the entry VG
- Explicitly reference the incoming VG expressions for SVE callee-saves
in functions with streaming mode changes
- Ensure the CFA is not described in terms of VG in functions with
  streaming mode changes

A more in-depth discussion of this scheme is available in:
https://gist.github.com/MacDue/b7a5c45d131d2440858165bfc903e97b

But the TLDR is that following this scheme, SME unwinding can be
implemented with minimal changes to existing unwinders. All unwinders
need to do is initialize VG to `CNTD` at the start of unwinding, then
everything else is handled by standard opcodes (which don't need changes
to handle VG).
2025-08-20 14:06:12 +01:00

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; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
; RUN: llc -mtriple=aarch64-linux-gnu -aarch64-streaming-hazard-size=0 -mattr=+sve -mattr=+sme2 -verify-machineinstrs < %s | FileCheck %s -check-prefixes=CHECK
; RUN: llc -mtriple=aarch64-linux-gnu -aarch64-streaming-hazard-size=0 -mattr=+sve -mattr=+sme2 -verify-machineinstrs -aarch64-lower-to-sme-routines=false < %s | FileCheck %s -check-prefixes=CHECK-NO-SME-ROUTINES
; RUN: llc -mtriple=aarch64-linux-gnu -aarch64-streaming-hazard-size=0 -mattr=+sve -mattr=+sme2 -mattr=+mops -verify-machineinstrs < %s | FileCheck %s -check-prefixes=CHECK-MOPS
@dst = global [512 x i8] zeroinitializer, align 1
@src = global [512 x i8] zeroinitializer, align 1
define void @se_memcpy(i64 noundef %n) "aarch64_pstate_sm_enabled" nounwind {
; CHECK-LABEL: se_memcpy:
; CHECK: // %bb.0: // %entry
; CHECK-NEXT: str x30, [sp, #-16]! // 8-byte Folded Spill
; CHECK-NEXT: mov x2, x0
; CHECK-NEXT: adrp x0, :got:dst
; CHECK-NEXT: adrp x1, :got:src
; CHECK-NEXT: ldr x0, [x0, :got_lo12:dst]
; CHECK-NEXT: ldr x1, [x1, :got_lo12:src]
; CHECK-NEXT: bl __arm_sc_memcpy
; CHECK-NEXT: ldr x30, [sp], #16 // 8-byte Folded Reload
; CHECK-NEXT: ret
;
; CHECK-NO-SME-ROUTINES-LABEL: se_memcpy:
; CHECK-NO-SME-ROUTINES: // %bb.0: // %entry
; CHECK-NO-SME-ROUTINES-NEXT: stp d15, d14, [sp, #-80]! // 16-byte Folded Spill
; CHECK-NO-SME-ROUTINES-NEXT: stp d13, d12, [sp, #16] // 16-byte Folded Spill
; CHECK-NO-SME-ROUTINES-NEXT: mov x2, x0
; CHECK-NO-SME-ROUTINES-NEXT: adrp x0, :got:dst
; CHECK-NO-SME-ROUTINES-NEXT: stp d11, d10, [sp, #32] // 16-byte Folded Spill
; CHECK-NO-SME-ROUTINES-NEXT: adrp x1, :got:src
; CHECK-NO-SME-ROUTINES-NEXT: stp d9, d8, [sp, #48] // 16-byte Folded Spill
; CHECK-NO-SME-ROUTINES-NEXT: str x30, [sp, #64] // 8-byte Folded Spill
; CHECK-NO-SME-ROUTINES-NEXT: ldr x0, [x0, :got_lo12:dst]
; CHECK-NO-SME-ROUTINES-NEXT: ldr x1, [x1, :got_lo12:src]
; CHECK-NO-SME-ROUTINES-NEXT: smstop sm
; CHECK-NO-SME-ROUTINES-NEXT: bl memcpy
; CHECK-NO-SME-ROUTINES-NEXT: smstart sm
; CHECK-NO-SME-ROUTINES-NEXT: ldp d9, d8, [sp, #48] // 16-byte Folded Reload
; CHECK-NO-SME-ROUTINES-NEXT: ldr x30, [sp, #64] // 8-byte Folded Reload
; CHECK-NO-SME-ROUTINES-NEXT: ldp d11, d10, [sp, #32] // 16-byte Folded Reload
; CHECK-NO-SME-ROUTINES-NEXT: ldp d13, d12, [sp, #16] // 16-byte Folded Reload
; CHECK-NO-SME-ROUTINES-NEXT: ldp d15, d14, [sp], #80 // 16-byte Folded Reload
; CHECK-NO-SME-ROUTINES-NEXT: ret
;
; CHECK-MOPS-LABEL: se_memcpy:
; CHECK-MOPS: // %bb.0: // %entry
; CHECK-MOPS-NEXT: adrp x8, :got:src
; CHECK-MOPS-NEXT: adrp x9, :got:dst
; CHECK-MOPS-NEXT: ldr x8, [x8, :got_lo12:src]
; CHECK-MOPS-NEXT: ldr x9, [x9, :got_lo12:dst]
; CHECK-MOPS-NEXT: cpyfp [x9]!, [x8]!, x0!
; CHECK-MOPS-NEXT: cpyfm [x9]!, [x8]!, x0!
; CHECK-MOPS-NEXT: cpyfe [x9]!, [x8]!, x0!
; CHECK-MOPS-NEXT: ret
entry:
tail call void @llvm.memcpy.p0.p0.i64(ptr align 1 @dst, ptr nonnull align 1 @src, i64 %n, i1 false)
ret void
}
define void @se_memset(i64 noundef %n) "aarch64_pstate_sm_enabled" nounwind {
; CHECK-LABEL: se_memset:
; CHECK: // %bb.0: // %entry
; CHECK-NEXT: str x30, [sp, #-16]! // 8-byte Folded Spill
; CHECK-NEXT: mov x2, x0
; CHECK-NEXT: adrp x0, :got:dst
; CHECK-NEXT: mov w1, #2 // =0x2
; CHECK-NEXT: ldr x0, [x0, :got_lo12:dst]
; CHECK-NEXT: bl __arm_sc_memset
; CHECK-NEXT: ldr x30, [sp], #16 // 8-byte Folded Reload
; CHECK-NEXT: ret
;
; CHECK-NO-SME-ROUTINES-LABEL: se_memset:
; CHECK-NO-SME-ROUTINES: // %bb.0: // %entry
; CHECK-NO-SME-ROUTINES-NEXT: stp d15, d14, [sp, #-80]! // 16-byte Folded Spill
; CHECK-NO-SME-ROUTINES-NEXT: stp d13, d12, [sp, #16] // 16-byte Folded Spill
; CHECK-NO-SME-ROUTINES-NEXT: mov x2, x0
; CHECK-NO-SME-ROUTINES-NEXT: adrp x0, :got:dst
; CHECK-NO-SME-ROUTINES-NEXT: stp d11, d10, [sp, #32] // 16-byte Folded Spill
; CHECK-NO-SME-ROUTINES-NEXT: stp d9, d8, [sp, #48] // 16-byte Folded Spill
; CHECK-NO-SME-ROUTINES-NEXT: str x30, [sp, #64] // 8-byte Folded Spill
; CHECK-NO-SME-ROUTINES-NEXT: ldr x0, [x0, :got_lo12:dst]
; CHECK-NO-SME-ROUTINES-NEXT: smstop sm
; CHECK-NO-SME-ROUTINES-NEXT: mov w1, #2 // =0x2
; CHECK-NO-SME-ROUTINES-NEXT: bl memset
; CHECK-NO-SME-ROUTINES-NEXT: smstart sm
; CHECK-NO-SME-ROUTINES-NEXT: ldp d9, d8, [sp, #48] // 16-byte Folded Reload
; CHECK-NO-SME-ROUTINES-NEXT: ldr x30, [sp, #64] // 8-byte Folded Reload
; CHECK-NO-SME-ROUTINES-NEXT: ldp d11, d10, [sp, #32] // 16-byte Folded Reload
; CHECK-NO-SME-ROUTINES-NEXT: ldp d13, d12, [sp, #16] // 16-byte Folded Reload
; CHECK-NO-SME-ROUTINES-NEXT: ldp d15, d14, [sp], #80 // 16-byte Folded Reload
; CHECK-NO-SME-ROUTINES-NEXT: ret
;
; CHECK-MOPS-LABEL: se_memset:
; CHECK-MOPS: // %bb.0: // %entry
; CHECK-MOPS-NEXT: adrp x8, :got:dst
; CHECK-MOPS-NEXT: mov w9, #2 // =0x2
; CHECK-MOPS-NEXT: ldr x8, [x8, :got_lo12:dst]
; CHECK-MOPS-NEXT: setp [x8]!, x0!, x9
; CHECK-MOPS-NEXT: setm [x8]!, x0!, x9
; CHECK-MOPS-NEXT: sete [x8]!, x0!, x9
; CHECK-MOPS-NEXT: ret
entry:
tail call void @llvm.memset.p0.i64(ptr align 1 @dst, i8 2, i64 %n, i1 false)
ret void
}
define void @se_memmove(i64 noundef %n) "aarch64_pstate_sm_enabled" nounwind {
; CHECK-LABEL: se_memmove:
; CHECK: // %bb.0: // %entry
; CHECK-NEXT: str x30, [sp, #-16]! // 8-byte Folded Spill
; CHECK-NEXT: mov x2, x0
; CHECK-NEXT: adrp x0, :got:dst
; CHECK-NEXT: adrp x1, :got:src
; CHECK-NEXT: ldr x0, [x0, :got_lo12:dst]
; CHECK-NEXT: ldr x1, [x1, :got_lo12:src]
; CHECK-NEXT: bl __arm_sc_memmove
; CHECK-NEXT: ldr x30, [sp], #16 // 8-byte Folded Reload
; CHECK-NEXT: ret
;
; CHECK-NO-SME-ROUTINES-LABEL: se_memmove:
; CHECK-NO-SME-ROUTINES: // %bb.0: // %entry
; CHECK-NO-SME-ROUTINES-NEXT: stp d15, d14, [sp, #-80]! // 16-byte Folded Spill
; CHECK-NO-SME-ROUTINES-NEXT: stp d13, d12, [sp, #16] // 16-byte Folded Spill
; CHECK-NO-SME-ROUTINES-NEXT: mov x2, x0
; CHECK-NO-SME-ROUTINES-NEXT: adrp x0, :got:dst
; CHECK-NO-SME-ROUTINES-NEXT: stp d11, d10, [sp, #32] // 16-byte Folded Spill
; CHECK-NO-SME-ROUTINES-NEXT: adrp x1, :got:src
; CHECK-NO-SME-ROUTINES-NEXT: stp d9, d8, [sp, #48] // 16-byte Folded Spill
; CHECK-NO-SME-ROUTINES-NEXT: str x30, [sp, #64] // 8-byte Folded Spill
; CHECK-NO-SME-ROUTINES-NEXT: ldr x0, [x0, :got_lo12:dst]
; CHECK-NO-SME-ROUTINES-NEXT: ldr x1, [x1, :got_lo12:src]
; CHECK-NO-SME-ROUTINES-NEXT: smstop sm
; CHECK-NO-SME-ROUTINES-NEXT: bl memmove
; CHECK-NO-SME-ROUTINES-NEXT: smstart sm
; CHECK-NO-SME-ROUTINES-NEXT: ldp d9, d8, [sp, #48] // 16-byte Folded Reload
; CHECK-NO-SME-ROUTINES-NEXT: ldr x30, [sp, #64] // 8-byte Folded Reload
; CHECK-NO-SME-ROUTINES-NEXT: ldp d11, d10, [sp, #32] // 16-byte Folded Reload
; CHECK-NO-SME-ROUTINES-NEXT: ldp d13, d12, [sp, #16] // 16-byte Folded Reload
; CHECK-NO-SME-ROUTINES-NEXT: ldp d15, d14, [sp], #80 // 16-byte Folded Reload
; CHECK-NO-SME-ROUTINES-NEXT: ret
;
; CHECK-MOPS-LABEL: se_memmove:
; CHECK-MOPS: // %bb.0: // %entry
; CHECK-MOPS-NEXT: adrp x8, :got:src
; CHECK-MOPS-NEXT: adrp x9, :got:dst
; CHECK-MOPS-NEXT: ldr x8, [x8, :got_lo12:src]
; CHECK-MOPS-NEXT: ldr x9, [x9, :got_lo12:dst]
; CHECK-MOPS-NEXT: cpyp [x9]!, [x8]!, x0!
; CHECK-MOPS-NEXT: cpym [x9]!, [x8]!, x0!
; CHECK-MOPS-NEXT: cpye [x9]!, [x8]!, x0!
; CHECK-MOPS-NEXT: ret
entry:
tail call void @llvm.memmove.p0.p0.i64(ptr align 1 @dst, ptr nonnull align 1 @src, i64 %n, i1 false)
ret void
}
define void @sc_memcpy(i64 noundef %n) "aarch64_pstate_sm_compatible" nounwind {
; CHECK-LABEL: sc_memcpy:
; CHECK: // %bb.0: // %entry
; CHECK-NEXT: str x30, [sp, #-16]! // 8-byte Folded Spill
; CHECK-NEXT: mov x2, x0
; CHECK-NEXT: adrp x0, :got:dst
; CHECK-NEXT: adrp x1, :got:src
; CHECK-NEXT: ldr x0, [x0, :got_lo12:dst]
; CHECK-NEXT: ldr x1, [x1, :got_lo12:src]
; CHECK-NEXT: bl __arm_sc_memcpy
; CHECK-NEXT: ldr x30, [sp], #16 // 8-byte Folded Reload
; CHECK-NEXT: ret
;
; CHECK-NO-SME-ROUTINES-LABEL: sc_memcpy:
; CHECK-NO-SME-ROUTINES: // %bb.0: // %entry
; CHECK-NO-SME-ROUTINES-NEXT: stp d15, d14, [sp, #-80]! // 16-byte Folded Spill
; CHECK-NO-SME-ROUTINES-NEXT: stp d13, d12, [sp, #16] // 16-byte Folded Spill
; CHECK-NO-SME-ROUTINES-NEXT: mov x2, x0
; CHECK-NO-SME-ROUTINES-NEXT: stp d11, d10, [sp, #32] // 16-byte Folded Spill
; CHECK-NO-SME-ROUTINES-NEXT: stp d9, d8, [sp, #48] // 16-byte Folded Spill
; CHECK-NO-SME-ROUTINES-NEXT: stp x30, x19, [sp, #64] // 16-byte Folded Spill
; CHECK-NO-SME-ROUTINES-NEXT: bl __arm_sme_state
; CHECK-NO-SME-ROUTINES-NEXT: mov x19, x0
; CHECK-NO-SME-ROUTINES-NEXT: adrp x0, :got:dst
; CHECK-NO-SME-ROUTINES-NEXT: adrp x1, :got:src
; CHECK-NO-SME-ROUTINES-NEXT: ldr x0, [x0, :got_lo12:dst]
; CHECK-NO-SME-ROUTINES-NEXT: ldr x1, [x1, :got_lo12:src]
; CHECK-NO-SME-ROUTINES-NEXT: tbz w19, #0, .LBB3_2
; CHECK-NO-SME-ROUTINES-NEXT: // %bb.1: // %entry
; CHECK-NO-SME-ROUTINES-NEXT: smstop sm
; CHECK-NO-SME-ROUTINES-NEXT: .LBB3_2: // %entry
; CHECK-NO-SME-ROUTINES-NEXT: bl memcpy
; CHECK-NO-SME-ROUTINES-NEXT: tbz w19, #0, .LBB3_4
; CHECK-NO-SME-ROUTINES-NEXT: // %bb.3: // %entry
; CHECK-NO-SME-ROUTINES-NEXT: smstart sm
; CHECK-NO-SME-ROUTINES-NEXT: .LBB3_4: // %entry
; CHECK-NO-SME-ROUTINES-NEXT: ldp x30, x19, [sp, #64] // 16-byte Folded Reload
; CHECK-NO-SME-ROUTINES-NEXT: ldp d9, d8, [sp, #48] // 16-byte Folded Reload
; CHECK-NO-SME-ROUTINES-NEXT: ldp d11, d10, [sp, #32] // 16-byte Folded Reload
; CHECK-NO-SME-ROUTINES-NEXT: ldp d13, d12, [sp, #16] // 16-byte Folded Reload
; CHECK-NO-SME-ROUTINES-NEXT: ldp d15, d14, [sp], #80 // 16-byte Folded Reload
; CHECK-NO-SME-ROUTINES-NEXT: ret
;
; CHECK-MOPS-LABEL: sc_memcpy:
; CHECK-MOPS: // %bb.0: // %entry
; CHECK-MOPS-NEXT: adrp x8, :got:src
; CHECK-MOPS-NEXT: adrp x9, :got:dst
; CHECK-MOPS-NEXT: ldr x8, [x8, :got_lo12:src]
; CHECK-MOPS-NEXT: ldr x9, [x9, :got_lo12:dst]
; CHECK-MOPS-NEXT: cpyfp [x9]!, [x8]!, x0!
; CHECK-MOPS-NEXT: cpyfm [x9]!, [x8]!, x0!
; CHECK-MOPS-NEXT: cpyfe [x9]!, [x8]!, x0!
; CHECK-MOPS-NEXT: ret
entry:
tail call void @llvm.memcpy.p0.p0.i64(ptr align 1 @dst, ptr nonnull align 1 @src, i64 %n, i1 false)
ret void
}
define void @sb_memcpy(i64 noundef %n) "aarch64_pstate_sm_body" nounwind {
; CHECK-LABEL: sb_memcpy:
; CHECK: // %bb.0: // %entry
; CHECK-NEXT: stp d15, d14, [sp, #-80]! // 16-byte Folded Spill
; CHECK-NEXT: stp d13, d12, [sp, #16] // 16-byte Folded Spill
; CHECK-NEXT: mov x2, x0
; CHECK-NEXT: stp d11, d10, [sp, #32] // 16-byte Folded Spill
; CHECK-NEXT: stp d9, d8, [sp, #48] // 16-byte Folded Spill
; CHECK-NEXT: str x30, [sp, #64] // 8-byte Folded Spill
; CHECK-NEXT: smstart sm
; CHECK-NEXT: adrp x0, :got:dst
; CHECK-NEXT: adrp x1, :got:src
; CHECK-NEXT: ldr x0, [x0, :got_lo12:dst]
; CHECK-NEXT: ldr x1, [x1, :got_lo12:src]
; CHECK-NEXT: bl __arm_sc_memcpy
; CHECK-NEXT: smstop sm
; CHECK-NEXT: ldp d9, d8, [sp, #48] // 16-byte Folded Reload
; CHECK-NEXT: ldr x30, [sp, #64] // 8-byte Folded Reload
; CHECK-NEXT: ldp d11, d10, [sp, #32] // 16-byte Folded Reload
; CHECK-NEXT: ldp d13, d12, [sp, #16] // 16-byte Folded Reload
; CHECK-NEXT: ldp d15, d14, [sp], #80 // 16-byte Folded Reload
; CHECK-NEXT: ret
;
; CHECK-NO-SME-ROUTINES-LABEL: sb_memcpy:
; CHECK-NO-SME-ROUTINES: // %bb.0: // %entry
; CHECK-NO-SME-ROUTINES-NEXT: stp d15, d14, [sp, #-80]! // 16-byte Folded Spill
; CHECK-NO-SME-ROUTINES-NEXT: stp d13, d12, [sp, #16] // 16-byte Folded Spill
; CHECK-NO-SME-ROUTINES-NEXT: mov x2, x0
; CHECK-NO-SME-ROUTINES-NEXT: stp d11, d10, [sp, #32] // 16-byte Folded Spill
; CHECK-NO-SME-ROUTINES-NEXT: stp d9, d8, [sp, #48] // 16-byte Folded Spill
; CHECK-NO-SME-ROUTINES-NEXT: str x30, [sp, #64] // 8-byte Folded Spill
; CHECK-NO-SME-ROUTINES-NEXT: smstart sm
; CHECK-NO-SME-ROUTINES-NEXT: adrp x0, :got:dst
; CHECK-NO-SME-ROUTINES-NEXT: adrp x1, :got:src
; CHECK-NO-SME-ROUTINES-NEXT: ldr x0, [x0, :got_lo12:dst]
; CHECK-NO-SME-ROUTINES-NEXT: ldr x1, [x1, :got_lo12:src]
; CHECK-NO-SME-ROUTINES-NEXT: smstop sm
; CHECK-NO-SME-ROUTINES-NEXT: bl memcpy
; CHECK-NO-SME-ROUTINES-NEXT: ldp d9, d8, [sp, #48] // 16-byte Folded Reload
; CHECK-NO-SME-ROUTINES-NEXT: ldr x30, [sp, #64] // 8-byte Folded Reload
; CHECK-NO-SME-ROUTINES-NEXT: ldp d11, d10, [sp, #32] // 16-byte Folded Reload
; CHECK-NO-SME-ROUTINES-NEXT: ldp d13, d12, [sp, #16] // 16-byte Folded Reload
; CHECK-NO-SME-ROUTINES-NEXT: ldp d15, d14, [sp], #80 // 16-byte Folded Reload
; CHECK-NO-SME-ROUTINES-NEXT: ret
;
; CHECK-MOPS-LABEL: sb_memcpy:
; CHECK-MOPS: // %bb.0: // %entry
; CHECK-MOPS-NEXT: stp d15, d14, [sp, #-64]! // 16-byte Folded Spill
; CHECK-MOPS-NEXT: stp d13, d12, [sp, #16] // 16-byte Folded Spill
; CHECK-MOPS-NEXT: stp d11, d10, [sp, #32] // 16-byte Folded Spill
; CHECK-MOPS-NEXT: stp d9, d8, [sp, #48] // 16-byte Folded Spill
; CHECK-MOPS-NEXT: smstart sm
; CHECK-MOPS-NEXT: adrp x8, :got:src
; CHECK-MOPS-NEXT: adrp x9, :got:dst
; CHECK-MOPS-NEXT: ldr x8, [x8, :got_lo12:src]
; CHECK-MOPS-NEXT: ldr x9, [x9, :got_lo12:dst]
; CHECK-MOPS-NEXT: cpyfp [x9]!, [x8]!, x0!
; CHECK-MOPS-NEXT: cpyfm [x9]!, [x8]!, x0!
; CHECK-MOPS-NEXT: cpyfe [x9]!, [x8]!, x0!
; CHECK-MOPS-NEXT: smstop sm
; CHECK-MOPS-NEXT: ldp d9, d8, [sp, #48] // 16-byte Folded Reload
; CHECK-MOPS-NEXT: ldp d11, d10, [sp, #32] // 16-byte Folded Reload
; CHECK-MOPS-NEXT: ldp d13, d12, [sp, #16] // 16-byte Folded Reload
; CHECK-MOPS-NEXT: ldp d15, d14, [sp], #64 // 16-byte Folded Reload
; CHECK-MOPS-NEXT: ret
entry:
tail call void @llvm.memcpy.p0.p0.i64(ptr align 1 @dst, ptr nonnull align 1 @src, i64 %n, i1 false)
ret void
}
declare void @llvm.memset.p0.i64(ptr nocapture writeonly, i8, i64, i1 immarg)
declare void @llvm.memcpy.p0.p0.i64(ptr nocapture writeonly, ptr nocapture readonly, i64, i1 immarg)
declare void @llvm.memmove.p0.p0.i64(ptr nocapture writeonly, ptr nocapture readonly, i64, i1 immarg)
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