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llvm-project/llvm/test/CodeGen/AArch64/sve-split-extract-elt.ll
Momchil Velikov 50a97aacac [AArch64] Async unwind - function prologues 
Re-commit of 32e8b550e5439c7e4aafa73894faffd5f25d0d05

This patch rearranges emission of CFI instructions, so the resulting
DWARF and `.eh_frame` information is precise at every instruction.

The current state is that the unwind info is emitted only after the
function prologue. This is fine for synchronous (e.g. C++) exceptions,
but the information is generally incorrect when the program counter is
at an instruction in the prologue or the epilogue, for example:

```
stp	x29, x30, [sp, #-16]!           // 16-byte Folded Spill
mov	x29, sp
.cfi_def_cfa w29, 16
...
```

after the `stp` is executed the (initial) rule for the CFA still says
the CFA is in the `sp`, even though it's already offset by 16 bytes

A correct unwind info could look like:
```
stp	x29, x30, [sp, #-16]!           // 16-byte Folded Spill
.cfi_def_cfa_offset 16
mov	x29, sp
.cfi_def_cfa w29, 16
...
```

Having this information precise up to an instruction is useful for
sampling profilers that would like to get a stack backtrace. The end
goal (towards this patch is just a step) is to have fully working
`-fasynchronous-unwind-tables`.

Reviewed By: danielkiss, MaskRay

Differential Revision: https://reviews.llvm.org/D111411
2022-03-24 16:16:44 +00:00

222 lines
8.2 KiB
LLVM
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; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
; RUN: llc -mtriple=aarch64-linux-gnu -mattr=+sve < %s | FileCheck %s
; EXTRACT VECTOR ELT
define i32 @promote_extract_2i32_idx(<vscale x 2 x i32> %a, i32 %idx) {
; CHECK-LABEL: promote_extract_2i32_idx:
; CHECK: // %bb.0:
; CHECK-NEXT: // kill: def $w0 killed $w0 def $x0
; CHECK-NEXT: sxtw x8, w0
; CHECK-NEXT: whilels p0.d, xzr, x8
; CHECK-NEXT: lastb x0, p0, z0.d
; CHECK-NEXT: // kill: def $w0 killed $w0 killed $x0
; CHECK-NEXT: ret
%ext = extractelement <vscale x 2 x i32> %a, i32 %idx
ret i32 %ext
}
define i8 @split_extract_32i8_idx(<vscale x 32 x i8> %a, i32 %idx) {
; CHECK-LABEL: split_extract_32i8_idx:
; CHECK: // %bb.0:
; CHECK-NEXT: str x29, [sp, #-16]! // 8-byte Folded Spill
; CHECK-NEXT: .cfi_def_cfa_offset 16
; CHECK-NEXT: .cfi_offset w29, -16
; CHECK-NEXT: addvl sp, sp, #-2
; CHECK-NEXT: .cfi_escape 0x0f, 0x0c, 0x8f, 0x00, 0x11, 0x10, 0x22, 0x11, 0x10, 0x92, 0x2e, 0x00, 0x1e, 0x22 // sp + 16 + 16 * VG
; CHECK-NEXT: mov x8, #-1
; CHECK-NEXT: // kill: def $w0 killed $w0 def $x0
; CHECK-NEXT: sxtw x9, w0
; CHECK-NEXT: ptrue p0.b
; CHECK-NEXT: st1b { z1.b }, p0, [sp, #1, mul vl]
; CHECK-NEXT: st1b { z0.b }, p0, [sp]
; CHECK-NEXT: addvl x8, x8, #2
; CHECK-NEXT: cmp x9, x8
; CHECK-NEXT: csel x8, x9, x8, lo
; CHECK-NEXT: mov x9, sp
; CHECK-NEXT: ldrb w0, [x9, x8]
; CHECK-NEXT: addvl sp, sp, #2
; CHECK-NEXT: ldr x29, [sp], #16 // 8-byte Folded Reload
; CHECK-NEXT: ret
%ext = extractelement <vscale x 32 x i8> %a, i32 %idx
ret i8 %ext
}
define i16 @split_extract_16i16_idx(<vscale x 16 x i16> %a, i32 %idx) {
; CHECK-LABEL: split_extract_16i16_idx:
; CHECK: // %bb.0:
; CHECK-NEXT: str x29, [sp, #-16]! // 8-byte Folded Spill
; CHECK-NEXT: .cfi_def_cfa_offset 16
; CHECK-NEXT: .cfi_offset w29, -16
; CHECK-NEXT: addvl sp, sp, #-2
; CHECK-NEXT: .cfi_escape 0x0f, 0x0c, 0x8f, 0x00, 0x11, 0x10, 0x22, 0x11, 0x10, 0x92, 0x2e, 0x00, 0x1e, 0x22 // sp + 16 + 16 * VG
; CHECK-NEXT: mov x8, #-1
; CHECK-NEXT: // kill: def $w0 killed $w0 def $x0
; CHECK-NEXT: sxtw x9, w0
; CHECK-NEXT: ptrue p0.h
; CHECK-NEXT: st1h { z1.h }, p0, [sp, #1, mul vl]
; CHECK-NEXT: st1h { z0.h }, p0, [sp]
; CHECK-NEXT: addvl x8, x8, #1
; CHECK-NEXT: cmp x9, x8
; CHECK-NEXT: csel x8, x9, x8, lo
; CHECK-NEXT: mov x9, sp
; CHECK-NEXT: ldrh w0, [x9, x8, lsl #1]
; CHECK-NEXT: addvl sp, sp, #2
; CHECK-NEXT: ldr x29, [sp], #16 // 8-byte Folded Reload
; CHECK-NEXT: ret
%ext = extractelement <vscale x 16 x i16> %a, i32 %idx
ret i16 %ext
}
define i32 @split_extract_8i32_idx(<vscale x 8 x i32> %a, i32 %idx) {
; CHECK-LABEL: split_extract_8i32_idx:
; CHECK: // %bb.0:
; CHECK-NEXT: str x29, [sp, #-16]! // 8-byte Folded Spill
; CHECK-NEXT: .cfi_def_cfa_offset 16
; CHECK-NEXT: .cfi_offset w29, -16
; CHECK-NEXT: addvl sp, sp, #-2
; CHECK-NEXT: .cfi_escape 0x0f, 0x0c, 0x8f, 0x00, 0x11, 0x10, 0x22, 0x11, 0x10, 0x92, 0x2e, 0x00, 0x1e, 0x22 // sp + 16 + 16 * VG
; CHECK-NEXT: cnth x8
; CHECK-NEXT: // kill: def $w0 killed $w0 def $x0
; CHECK-NEXT: sxtw x9, w0
; CHECK-NEXT: sub x8, x8, #1
; CHECK-NEXT: ptrue p0.s
; CHECK-NEXT: cmp x9, x8
; CHECK-NEXT: st1w { z1.s }, p0, [sp, #1, mul vl]
; CHECK-NEXT: csel x8, x9, x8, lo
; CHECK-NEXT: mov x9, sp
; CHECK-NEXT: st1w { z0.s }, p0, [sp]
; CHECK-NEXT: ldr w0, [x9, x8, lsl #2]
; CHECK-NEXT: addvl sp, sp, #2
; CHECK-NEXT: ldr x29, [sp], #16 // 8-byte Folded Reload
; CHECK-NEXT: ret
%ext = extractelement <vscale x 8 x i32> %a, i32 %idx
ret i32 %ext
}
define i64 @split_extract_8i64_idx(<vscale x 8 x i64> %a, i32 %idx) {
; CHECK-LABEL: split_extract_8i64_idx:
; CHECK: // %bb.0:
; CHECK-NEXT: str x29, [sp, #-16]! // 8-byte Folded Spill
; CHECK-NEXT: .cfi_def_cfa_offset 16
; CHECK-NEXT: .cfi_offset w29, -16
; CHECK-NEXT: addvl sp, sp, #-4
; CHECK-NEXT: .cfi_escape 0x0f, 0x0c, 0x8f, 0x00, 0x11, 0x10, 0x22, 0x11, 0x20, 0x92, 0x2e, 0x00, 0x1e, 0x22 // sp + 16 + 32 * VG
; CHECK-NEXT: cnth x8
; CHECK-NEXT: // kill: def $w0 killed $w0 def $x0
; CHECK-NEXT: sxtw x9, w0
; CHECK-NEXT: sub x8, x8, #1
; CHECK-NEXT: ptrue p0.d
; CHECK-NEXT: cmp x9, x8
; CHECK-NEXT: st1d { z3.d }, p0, [sp, #3, mul vl]
; CHECK-NEXT: csel x8, x9, x8, lo
; CHECK-NEXT: mov x9, sp
; CHECK-NEXT: st1d { z2.d }, p0, [sp, #2, mul vl]
; CHECK-NEXT: st1d { z1.d }, p0, [sp, #1, mul vl]
; CHECK-NEXT: st1d { z0.d }, p0, [sp]
; CHECK-NEXT: ldr x0, [x9, x8, lsl #3]
; CHECK-NEXT: addvl sp, sp, #4
; CHECK-NEXT: ldr x29, [sp], #16 // 8-byte Folded Reload
; CHECK-NEXT: ret
%ext = extractelement <vscale x 8 x i64> %a, i32 %idx
ret i64 %ext
}
; EXTRACT VECTOR ELT, CONSTANT IDX
define i16 @promote_extract_4i16(<vscale x 4 x i16> %a) {
; CHECK-LABEL: promote_extract_4i16:
; CHECK: // %bb.0:
; CHECK-NEXT: mov w0, v0.s[1]
; CHECK-NEXT: ret
%ext = extractelement <vscale x 4 x i16> %a, i32 1
ret i16 %ext
}
define i8 @split_extract_32i8(<vscale x 32 x i8> %a) {
; CHECK-LABEL: split_extract_32i8:
; CHECK: // %bb.0:
; CHECK-NEXT: umov w0, v0.b[3]
; CHECK-NEXT: ret
%ext = extractelement <vscale x 32 x i8> %a, i32 3
ret i8 %ext
}
define i16 @split_extract_16i16(<vscale x 16 x i16> %a) {
; CHECK-LABEL: split_extract_16i16:
; CHECK: // %bb.0:
; CHECK-NEXT: str x29, [sp, #-16]! // 8-byte Folded Spill
; CHECK-NEXT: .cfi_def_cfa_offset 16
; CHECK-NEXT: .cfi_offset w29, -16
; CHECK-NEXT: addvl sp, sp, #-2
; CHECK-NEXT: .cfi_escape 0x0f, 0x0c, 0x8f, 0x00, 0x11, 0x10, 0x22, 0x11, 0x10, 0x92, 0x2e, 0x00, 0x1e, 0x22 // sp + 16 + 16 * VG
; CHECK-NEXT: mov x8, #-1
; CHECK-NEXT: mov w9, #128
; CHECK-NEXT: ptrue p0.h
; CHECK-NEXT: st1h { z1.h }, p0, [sp, #1, mul vl]
; CHECK-NEXT: st1h { z0.h }, p0, [sp]
; CHECK-NEXT: addvl x8, x8, #1
; CHECK-NEXT: cmp x8, #128
; CHECK-NEXT: csel x8, x8, x9, lo
; CHECK-NEXT: mov x9, sp
; CHECK-NEXT: ldrh w0, [x9, x8, lsl #1]
; CHECK-NEXT: addvl sp, sp, #2
; CHECK-NEXT: ldr x29, [sp], #16 // 8-byte Folded Reload
; CHECK-NEXT: ret
%ext = extractelement <vscale x 16 x i16> %a, i32 128
ret i16 %ext
}
define i32 @split_extract_16i32(<vscale x 16 x i32> %a) {
; CHECK-LABEL: split_extract_16i32:
; CHECK: // %bb.0:
; CHECK-NEXT: str x29, [sp, #-16]! // 8-byte Folded Spill
; CHECK-NEXT: .cfi_def_cfa_offset 16
; CHECK-NEXT: .cfi_offset w29, -16
; CHECK-NEXT: addvl sp, sp, #-4
; CHECK-NEXT: .cfi_escape 0x0f, 0x0c, 0x8f, 0x00, 0x11, 0x10, 0x22, 0x11, 0x20, 0x92, 0x2e, 0x00, 0x1e, 0x22 // sp + 16 + 32 * VG
; CHECK-NEXT: mov x8, #-1
; CHECK-NEXT: mov w9, #34464
; CHECK-NEXT: movk w9, #1, lsl #16
; CHECK-NEXT: ptrue p0.s
; CHECK-NEXT: st1w { z3.s }, p0, [sp, #3, mul vl]
; CHECK-NEXT: st1w { z2.s }, p0, [sp, #2, mul vl]
; CHECK-NEXT: addvl x8, x8, #1
; CHECK-NEXT: st1w { z1.s }, p0, [sp, #1, mul vl]
; CHECK-NEXT: cmp x8, x9
; CHECK-NEXT: st1w { z0.s }, p0, [sp]
; CHECK-NEXT: csel x8, x8, x9, lo
; CHECK-NEXT: mov x9, sp
; CHECK-NEXT: ldr w0, [x9, x8, lsl #2]
; CHECK-NEXT: addvl sp, sp, #4
; CHECK-NEXT: ldr x29, [sp], #16 // 8-byte Folded Reload
; CHECK-NEXT: ret
%ext = extractelement <vscale x 16 x i32> %a, i32 100000
ret i32 %ext
}
define i64 @split_extract_4i64(<vscale x 4 x i64> %a) {
; CHECK-LABEL: split_extract_4i64:
; CHECK: // %bb.0:
; CHECK-NEXT: str x29, [sp, #-16]! // 8-byte Folded Spill
; CHECK-NEXT: .cfi_def_cfa_offset 16
; CHECK-NEXT: .cfi_offset w29, -16
; CHECK-NEXT: addvl sp, sp, #-2
; CHECK-NEXT: .cfi_escape 0x0f, 0x0c, 0x8f, 0x00, 0x11, 0x10, 0x22, 0x11, 0x10, 0x92, 0x2e, 0x00, 0x1e, 0x22 // sp + 16 + 16 * VG
; CHECK-NEXT: cntw x8
; CHECK-NEXT: mov w9, #10
; CHECK-NEXT: sub x8, x8, #1
; CHECK-NEXT: ptrue p0.d
; CHECK-NEXT: cmp x8, #10
; CHECK-NEXT: st1d { z1.d }, p0, [sp, #1, mul vl]
; CHECK-NEXT: csel x8, x8, x9, lo
; CHECK-NEXT: mov x9, sp
; CHECK-NEXT: st1d { z0.d }, p0, [sp]
; CHECK-NEXT: ldr x0, [x9, x8, lsl #3]
; CHECK-NEXT: addvl sp, sp, #2
; CHECK-NEXT: ldr x29, [sp], #16 // 8-byte Folded Reload
; CHECK-NEXT: ret
%ext = extractelement <vscale x 4 x i64> %a, i32 10
ret i64 %ext
}
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