gas/testsuite/gas/aarch64/programmer-friendly.s

   1 // programmer-friendly.s Test file for AArch64 instructions variants that are
   2 // not part of the architectural assembly syntax but are supported for the
   3 // ease of assembly level programming.
   4
   5 .text
   6         // The preferred architectural syntax does not accept the shifter
   7         // LSL or any other shift operator, when the destination register
   8         // has the shape of 16B or 8B.
   9         movi    v0.16b, 97, lsl 0
  10
  11         // LDR Wt, label | =value
  12         // As a convenience assemblers will typically permit the notation
  13         // "=value" in conjunction with the pc-relative literal load
  14         // instructions to automatically place an immediate value or
  15         // symbolic address in a nearby literal pool and generate a hidden
  16         // label which references it.
  17         ldrsw   x1, =0xdeadbeef
  18         ldrsw   x7, u16_lable + 4
  19
  20         // CCMN Xn, Xm, #uimm4, cond
  21         // As a convenience, GAS accepts a string representation for #uimm4,
  22         // e.g. NzCv for #0xa (0b1010).
  23         ccmp    x1, x2, NzCv, GE
  24
  25 .data
  26 u16_lable:
  27         .word   0xdeadbeef
  28         .word   0xcafebabe
  29
  30 .text
  31         // UXT[BHW] Wd, Wn
  32         // Unsigned Extend Byte|Halfword|Word: UXT[BH] is architectural alias
  33         // for UBFM Wd,Wn,#0,#7|15, while UXTW is pseudo instruction which is
  34         // encoded using ORR Wd, WZR, Wn (MOV Wd,Wn).
  35         // A programmer-friendly assembler should accept a destination Xd in
  36         // place of Wd, however that is not the preferred form for disassembly.
  37         uxtb    x15, w21
  38         uxth    x7, w27
  39         uxtw    x8, wzr
  40
  41
  42         // ADDS <Xd>, <Xn|SP>, <R><m>{, UXTB {#<amount>}}
  43         // In the 64-bit form, the final register operand is written as Wm
  44         // for all but the (possibly omitted) UXTX/LSL and SXTX
  45         // operators.
  46         // As a programmer-friendly assembler, we allow e.g.
  47         // ADDS <Xd>, <Xn|SP>, <Xm>{, UXTB {#<amount>}} by changing it to
  48         // ADDS <Xd>, <Xn|SP>, <Wm>{, UXTB {#<amount>}}.
  49         adds    x0, sp, x0, uxtb #4
  50         adds    x0, sp, x0, uxth #4
  51         adds    x0, sp, x0, uxtw #4
  52         adds    x0, sp, x0, sxtb #0
  53         adds    x0, sp, x0, sxth #1
  54         adds    x0, sp, x0, sxtw #2