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target-mips: fix mipsdsp_trunc16_sat16_round

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This change corrects rounding and saturation of Q31 fractional value in
mipsdsp_trunc16_sat16_round(). Overflow detection was incorrect for the
corner case for PRECRQ_RS.PH, and this test case is also part of the change.

Signed-off-by: Petar Jovanovic <petar.jovanovic@imgtec.com>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
This commit is contained in:
Petar Jovanovic 2013-07-01 01:54:47 +02:00 • committed by Aurelien Jarno
parent 05b3274b6b
commit d36c231f4b
2 changed files with 31 additions and 9 deletions
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24
tests/tcg/mips/mips32-dsp/precrq_rs_ph_w.c
View file

@ -12,18 +12,34 @@ int main()
result = 0x12348765;
__asm
("precrq_rs.ph.w %0, %1, %2\n\t"
("wrdsp $0\n\t"
"precrq_rs.ph.w %0, %1, %2\n\t"
: "=r"(rd)
: "r"(rs), "r"(rt)
);
assert(result == rd);
rs = 0x7fffC678;
rs = 0x7FFFC678;
rt = 0x865432A0;
result = 0x7fff8654;
result = 0x7FFF8654;
__asm
("precrq_rs.ph.w %0, %2, %3\n\t"
("wrdsp $0\n\t"
"precrq_rs.ph.w %0, %2, %3\n\t"
"rddsp %1\n\t"
: "=r"(rd), "=r"(dsp)
: "r"(rs), "r"(rt)
);
assert(((dsp >> 22) & 0x01) == 1);
assert(result == rd);
rs = 0xBEEFFEED;
rt = 0x7FFF8000;
result = 0xBEF07FFF;
__asm
("wrdsp $0\n\t"
"precrq_rs.ph.w %0, %2, %3\n\t"
"rddsp %1\n\t"
: "=r"(rd), "=r"(dsp)
: "r"(rs), "r"(rt)