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author | Subv <subv2112@gmail.com> | 2017-05-08 23:24:08 +0200 |
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committer | Subv <subv2112@gmail.com> | 2017-05-14 01:03:41 +0200 |
commit | a0874a7a687ac2ff606aca832f5dd21b14d75053 (patch) | |
tree | bdfb920bf747a28273bb1336c2d8431baca60048 /src/core/arm/skyeye_common/vfp/vfpsingle.cpp | |
parent | Merge pull request #2682 from nicoboss/filter (diff) | |
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Diffstat (limited to '')
-rw-r--r-- | src/core/arm/skyeye_common/vfp/vfpsingle.cpp | 14 |
1 files changed, 12 insertions, 2 deletions
diff --git a/src/core/arm/skyeye_common/vfp/vfpsingle.cpp b/src/core/arm/skyeye_common/vfp/vfpsingle.cpp index 1590d89a4..8034d8398 100644 --- a/src/core/arm/skyeye_common/vfp/vfpsingle.cpp +++ b/src/core/arm/skyeye_common/vfp/vfpsingle.cpp @@ -1062,12 +1062,22 @@ static u32 vfp_single_fadd(ARMul_State* state, int sd, int sn, s32 m, u32 fpscr) static u32 vfp_single_fsub(ARMul_State* state, int sd, int sn, s32 m, u32 fpscr) { LOG_TRACE(Core_ARM11, "s%u = %08x", sn, sd); /* - * Subtraction is addition with one sign inverted. + * Subtraction is addition with one sign inverted. Unpack the second operand to perform FTZ if + * necessary, we can't let fadd do this because a denormal in m might get flushed to +0 in FTZ + * mode, and the resulting sign of 0 OP +0 differs between fadd and fsub. We do not need to do + * this for n because +0 OP 0 is always +0 for both fadd and fsub. */ + struct vfp_single vsm; + u32 exceptions = vfp_single_unpack(&vsm, m, fpscr); + if (exceptions & FPSCR_IDC) { + // The value was flushed to zero, re-pack it. + m = vfp_single_pack(&vsm); + } + if (m != 0x7FC00000) // Only negate if m isn't NaN. m = vfp_single_packed_negate(m); - return vfp_single_fadd(state, sd, sn, m, fpscr); + return vfp_single_fadd(state, sd, sn, m, fpscr) | exceptions; } /* |