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author | Merry <MerryMage@users.noreply.github.com> | 2017-05-22 01:50:52 +0200 |
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committer | GitHub <noreply@github.com> | 2017-05-22 01:50:52 +0200 |
commit | 188d63fdb62fbbcfa287e470cefa6c27efa2977d (patch) | |
tree | 694246e4d8bfcfa175953cbc70b018fb3f8d6ea3 | |
parent | Merge pull request #2719 from lioncash/catch (diff) | |
parent | Dyncom/VFP: Perform flush-to-zero on the second operand of vsub before sending it to vadd. (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 ae5b325f0..6b4cb8efa 100644 --- a/src/core/arm/skyeye_common/vfp/vfpsingle.cpp +++ b/src/core/arm/skyeye_common/vfp/vfpsingle.cpp @@ -1049,12 +1049,22 @@ 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; } /* |