From 990aa328be42b27b78fcd40c6402971c3c49aac4 Mon Sep 17 00:00:00 2001 From: Fredrik Noring Date: Sun, 21 Oct 2018 17:42:08 +0200 Subject: tests/tcg/mips: Add tests for R5900 DIV1 Add a test for DIV1. Reviewed-by: Aleksandar Markovic Signed-off-by: Fredrik Noring Signed-off-by: Aleksandar Markovic --- tests/tcg/mips/mipsr5900/Makefile | 3 +- tests/tcg/mips/mipsr5900/div1.c | 73 +++++++++++++++++++++++++++++++++++++++ 2 files changed, 75 insertions(+), 1 deletion(-) create mode 100644 tests/tcg/mips/mipsr5900/div1.c (limited to 'tests') diff --git a/tests/tcg/mips/mipsr5900/Makefile b/tests/tcg/mips/mipsr5900/Makefile index 287c248..757eb83 100644 --- a/tests/tcg/mips/mipsr5900/Makefile +++ b/tests/tcg/mips/mipsr5900/Makefile @@ -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 diff --git a/tests/tcg/mips/mipsr5900/div1.c b/tests/tcg/mips/mipsr5900/div1.c new file mode 100644 index 0000000..83dafa0 --- /dev/null +++ b/tests/tcg/mips/mipsr5900/div1.c @@ -0,0 +1,73 @@ +/* + * Test R5900-specific DIV1. + */ + +#include +#include +#include + +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; +} -- cgit v1.1