From 2cfbf36ec07f7cac1aabb3b86f1c95c8a55424ba Mon Sep 17 00:00:00 2001 From: Peter Maydell Date: Thu, 31 May 2018 14:50:51 +0100 Subject: 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 Reviewed-by: Richard Henderson Message-id: 20180521172712.19930-1-peter.maydell@linaro.org --- target/arm/helper-a64.c | 6 ++++++ 1 file changed, 6 insertions(+) (limited to 'target') diff --git a/target/arm/helper-a64.c b/target/arm/helper-a64.c index f92bdea732..c4d2a04827 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); -- cgit v1.2.3