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| author | Peter Maydell <peter.maydell@linaro.org> | 2018-05-31 14:50:51 +0100 |
|---|---|---|
| committer | Peter Maydell <peter.maydell@linaro.org> | 2018-05-31 14:50:51 +0100 |
| commit | 2cfbf36ec07f7cac1aabb3b86f1c95c8a55424ba (patch) | |
| tree | 9a2dd2594d751d43234a46d92ebac703cdbf2e1c /target/arm/helper-a64.c | |
| parent | a3ac12fba028df90f7b3dbec924995c126c41022 (diff) | |
| download | qemu-2cfbf36ec07f7cac1aabb3b86f1c95c8a55424ba.zip qemu-2cfbf36ec07f7cac1aabb3b86f1c95c8a55424ba.tar.gz qemu-2cfbf36ec07f7cac1aabb3b86f1c95c8a55424ba.tar.bz2 | |
target/arm: Honour FPCR.FZ in FRECPX
The FRECPX instructions should (like most other floating point operations)
honour the FPCR.FZ bit which specifies whether input denormals should
be flushed to zero (or FZ16 for the half-precision version).
We forgot to implement this, which doesn't affect the results (since
the calculation doesn't actually care about the mantissa bits) but did
mean we were failing to set the FPSR.IDC bit.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20180521172712.19930-1-peter.maydell@linaro.org
Diffstat (limited to 'target/arm/helper-a64.c')
| -rw-r--r-- | target/arm/helper-a64.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/target/arm/helper-a64.c b/target/arm/helper-a64.c index f92bdea..c4d2a04 100644 --- a/target/arm/helper-a64.c +++ b/target/arm/helper-a64.c @@ -384,6 +384,8 @@ float16 HELPER(frecpx_f16)(float16 a, void *fpstp) return nan; } + a = float16_squash_input_denormal(a, fpst); + val16 = float16_val(a); sbit = 0x8000 & val16; exp = extract32(val16, 10, 5); @@ -413,6 +415,8 @@ float32 HELPER(frecpx_f32)(float32 a, void *fpstp) return nan; } + a = float32_squash_input_denormal(a, fpst); + val32 = float32_val(a); sbit = 0x80000000ULL & val32; exp = extract32(val32, 23, 8); @@ -442,6 +446,8 @@ float64 HELPER(frecpx_f64)(float64 a, void *fpstp) return nan; } + a = float64_squash_input_denormal(a, fpst); + val64 = float64_val(a); sbit = 0x8000000000000000ULL & val64; exp = extract64(float64_val(a), 52, 11); |