mirror of https://gitee.com/openkylin/qemu.git
tests/tcg/mips: Add tests for R5900 DIV1
Add a test for DIV1. Reviewed-by: Aleksandar Markovic <amarkovic@wavecomp.com> Signed-off-by: Fredrik Noring <noring@nocrew.org> Signed-off-by: Aleksandar Markovic <amarkovic@wavecomp.com>
This commit is contained in:
parent
4d261a6a59
commit
990aa328be
|
@ -8,7 +8,8 @@ SIM_FLAGS=-cpu R5900
|
|||
CC = $(CROSS)gcc
|
||||
CFLAGS = -Wall -mabi=32 -march=r5900 -static
|
||||
|
||||
TESTCASES = mflohi1.tst
|
||||
TESTCASES = div1.tst
|
||||
TESTCASES += mflohi1.tst
|
||||
TESTCASES += mtlohi1.tst
|
||||
TESTCASES += mult.tst
|
||||
TESTCASES += multu.tst
|
||||
|
|
|
@ -0,0 +1,73 @@
|
|||
/*
|
||||
* Test R5900-specific DIV1.
|
||||
*/
|
||||
|
||||
#include <stdio.h>
|
||||
#include <inttypes.h>
|
||||
#include <assert.h>
|
||||
|
||||
struct quotient_remainder { int32_t quotient, remainder; };
|
||||
|
||||
static struct quotient_remainder div1(int32_t rs, int32_t rt)
|
||||
{
|
||||
int32_t lo, hi;
|
||||
|
||||
__asm__ __volatile__ (
|
||||
" div1 $0, %2, %3\n"
|
||||
" mflo1 %0\n"
|
||||
" mfhi1 %1\n"
|
||||
: "=r" (lo), "=r" (hi)
|
||||
: "r" (rs), "r" (rt));
|
||||
|
||||
assert(rs / rt == lo);
|
||||
assert(rs % rt == hi);
|
||||
|
||||
return (struct quotient_remainder) { .quotient = lo, .remainder = hi };
|
||||
}
|
||||
|
||||
static void verify_div1(int32_t rs, int32_t rt,
|
||||
int32_t expected_quotient,
|
||||
int32_t expected_remainder)
|
||||
{
|
||||
struct quotient_remainder qr = div1(rs, rt);
|
||||
|
||||
assert(qr.quotient == expected_quotient);
|
||||
assert(qr.remainder == expected_remainder);
|
||||
}
|
||||
|
||||
static void verify_div1_negations(int32_t rs, int32_t rt,
|
||||
int32_t expected_quotient,
|
||||
int32_t expected_remainder)
|
||||
{
|
||||
verify_div1(rs, rt, expected_quotient, expected_remainder);
|
||||
verify_div1(rs, -rt, -expected_quotient, expected_remainder);
|
||||
verify_div1(-rs, rt, -expected_quotient, -expected_remainder);
|
||||
verify_div1(-rs, -rt, expected_quotient, -expected_remainder);
|
||||
}
|
||||
|
||||
int main()
|
||||
{
|
||||
verify_div1_negations(0, 1, 0, 0);
|
||||
verify_div1_negations(1, 1, 1, 0);
|
||||
verify_div1_negations(1, 2, 0, 1);
|
||||
verify_div1_negations(17, 19, 0, 17);
|
||||
verify_div1_negations(19, 17, 1, 2);
|
||||
verify_div1_negations(77773, 101, 770, 3);
|
||||
|
||||
verify_div1(-0x80000000, 1, -0x80000000, 0);
|
||||
|
||||
/*
|
||||
* Supplementary explanation from the Toshiba TX System RISC TX79 Core
|
||||
* Architecture manual, A-38 and B-7, https://wiki.qemu.org/File:C790.pdf
|
||||
*
|
||||
* Normally, when 0x80000000 (-2147483648) the signed minimum value is
|
||||
* divided by 0xFFFFFFFF (-1), the operation will result in an overflow.
|
||||
* However, in this instruction an overflow exception doesn't occur and
|
||||
* the result will be as follows:
|
||||
*
|
||||
* Quotient is 0x80000000 (-2147483648), and remainder is 0x00000000 (0).
|
||||
*/
|
||||
verify_div1(-0x80000000, -1, -0x80000000, 0);
|
||||
|
||||
return 0;
|
||||
}
|
Loading…
Reference in New Issue