src/asmtest/isa/rv64uamt/amomax_d.S

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//------------------------------------------------------------------------
// This code tests amomax_d instruction in multi-threading system.
// All threads execute an amomax_w instruction.
// Master thread (i.e., thread 0) waits for all threads to complete by
// spinning on the barrier variable until all threads update the variable.
// Then, the master thread checks the shared variable's value.
//------------------------------------------------------------------------

#include "riscv_test.h"
#include "test_macros.h"
#include "test_macros_mt.h"

  RVTEST_RV64U
  RVTEST_CODE_BEGIN

#define RESULT      0x12343eeaaf423451

//------------------------------------------------------------------------
// Reinitialize shared_var to 0x8000000000000000
//------------------------------------------------------------------------
  la  a0, shared_var
  li  t0, 0x8000000000000000
  sd  t0, (a0)

//------------------------------------------------------------------------
// Master thread creates new threads, waits for all threads to complete,
// deallocates threads and checks result
//------------------------------------------------------------------------
  call _create_threads
  call _join
  call _delete_threads
  call _check

  RVTEST_CODE_END

//------------------------------------------------------------------------
// mt_test function executed in child threads
// A child thread signals its completion by atomicaly adding 1 to barrier
//------------------------------------------------------------------------
_mt_test:
  la        a0, shared_var
  la        t0, array_index
  li        t1, 8
  amoadd.d  t1, t1, (t0)        // get my array_index

  la        t0, array
  add       t0, t0, t1
  ld        t0, (t0)            // get array[array_index]

  amomax.d  zero, t0, (a0)

  li        t0, 1
  la        a0, barrier
  amoadd.d  zero, t0, (a0)

  RVTEST_CODE_END

//------------------------------------------------------------------------
// Master thread checks result
//------------------------------------------------------------------------
_check:
  la        a0, shared_var
  li        a1, RESULT
  ld        a0, (a0)
  bne       a0, a1, _fail
  li        a0, SUCCESS
  ret

_fail:
  li        a0, FAILURE
  ret

  .data

MT_DATA
array_index:    .dword    0;