| // programmer-friendly.s Test file for AArch64 instructions variants that are |
| // not part of the architectural assembly syntax but are supported for the |
| // ease of assembly level programming. |
| |
| .text |
| // The preferred architectural syntax does not accept the shifter |
| // LSL or any other shift operator, when the destination register |
| // has the shape of 16B or 8B. |
| movi v0.16b, 97, lsl 0 // N.B.: this is now part of the architecture specification. |
| |
| // LDR Wt, label | =value |
| // As a convenience assemblers will typically permit the notation |
| // "=value" in conjunction with the pc-relative literal load |
| // instructions to automatically place an immediate value or |
| // symbolic address in a nearby literal pool and generate a hidden |
| // label which references it. |
| ldrsw x1, =0xdeadbeef |
| ldrsw x7, u16_lable + 4 |
| |
| // CCMN Xn, Xm, #uimm4, cond |
| // As a convenience, GAS accepts a string representation for #uimm4, |
| // e.g. NzCv for #0xa (0b1010). |
| ccmp x1, x2, NzCv, GE |
| |
| .data |
| u16_lable: |
| .word 0xdeadbeef |
| .word 0xcafebabe |
| |
| .text |
| // UXT[BHW] Wd, Wn |
| // Unsigned Extend Byte|Halfword|Word: UXT[BH] is architectural alias |
| // for UBFM Wd,Wn,#0,#7|15, while UXTW is pseudo instruction which is |
| // encoded using ORR Wd, WZR, Wn (MOV Wd,Wn). |
| // A programmer-friendly assembler should accept a destination Xd in |
| // place of Wd, however that is not the preferred form for disassembly. |
| uxtb x15, w21 |
| uxth x7, w27 |
| uxtw x8, wzr |
| |
| |
| // ADDS <Xd>, <Xn|SP>, <R><m>{, UXTB {#<amount>}} |
| // In the 64-bit form, the final register operand is written as Wm |
| // for all but the (possibly omitted) UXTX/LSL and SXTX |
| // operators. |
| // As a programmer-friendly assembler, we allow e.g. |
| // ADDS <Xd>, <Xn|SP>, <Xm>{, UXTB {#<amount>}} by changing it to |
| // ADDS <Xd>, <Xn|SP>, <Wm>{, UXTB {#<amount>}}. |
| adds x0, sp, x0, uxtb #4 |
| adds x0, sp, x0, uxth #4 |
| adds x0, sp, x0, uxtw #4 |
| |
| adds x0, sp, x0, sxtb #0 |
| adds x0, sp, x0, sxth #1 |
| adds x0, sp, x0, sxtw #2 |
| |
| // More tests on |
| // LDR Wt, label | =value |
| // Find more comment above. |
| ldr q0, =0xdeadcafebeefbabe0123456789abcedf |
| ldr d0, =0xfebeefbabe012345 |
| ldr x0, =0xfebeefbabe012345 |
| ldr s0, =0xdeadbeef |
| ldr w0, =0xdeadbeef |
| ldr x0, =u16_lable |
