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| author | Peter Maydell <peter.maydell@linaro.org> | 2011-01-14 20:39:18 +0100 |
|---|---|---|
| committer | Aurelien Jarno <aurelien@aurel32.net> | 2011-01-14 20:39:18 +0100 |
| commit | 9ea62f571ce8953dba1d2bad2bdeaf9c3a84b7d7 (patch) | |
| tree | 8895bae6a06582fa53a2cbee9a9bec360cb53c76 /target-arm | |
| parent | 6f3300ad2b5a1e7090720993d9fcb9f550259e12 (diff) | |
| download | qemu-9ea62f571ce8953dba1d2bad2bdeaf9c3a84b7d7.tar.gz | |
target-arm: Fix implementation of VRSQRTS
The implementation of the ARM VRSQRTS instruction (which calculates
(3 - op1 * op2) / 2) was missing the division operation. It also
did not handle the special cases of (0,inf) and (inf,0).
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Aurelien Jarno <aurelien@aurel32.net>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
Diffstat (limited to 'target-arm')
| -rw-r--r-- | target-arm/helper.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/target-arm/helper.c b/target-arm/helper.c index 705b99f9cb..ac47de0cba 100644 --- a/target-arm/helper.c +++ b/target-arm/helper.c @@ -2612,8 +2612,16 @@ float32 HELPER(recps_f32)(float32 a, float32 b, CPUState *env) float32 HELPER(rsqrts_f32)(float32 a, float32 b, CPUState *env) { float_status *s = &env->vfp.fp_status; + float32 two = int32_to_float32(2, s); float32 three = int32_to_float32(3, s); - return float32_sub(three, float32_mul(a, b, s), s); + float32 product; + if ((float32_is_infinity(a) && float32_is_zero_or_denormal(b)) || + (float32_is_infinity(b) && float32_is_zero_or_denormal(a))) { + product = float32_zero; + } else { + product = float32_mul(a, b, s); + } + return float32_div(float32_sub(three, product, s), two, s); } /* NEON helpers. */ |