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CPU: Produce non-inf results for RSQRTE instruction with subnormal inputs

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Gabriel A 2024-04-09 01:28:19 -03:00
commit 29522b38ab
1 changed files with 10 additions and 2 deletions
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12
src/ARMeilleure/Instructions/InstEmitSimdArithmetic.cs
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@ -2426,7 +2426,11 @@ namespace ARMeilleure.Instructions
} }
else if (Optimizations.FastFP && Optimizations.UseSse41 && sizeF == 0) else if (Optimizations.FastFP && Optimizations.UseSse41 && sizeF == 0)
{ {
Operand res = EmitSse41Round32Exp8OpF(context, context.AddIntrinsic(Intrinsic.X86Rsqrtss, GetVec(op.Rn)), scalar: true); // RSQRTSS handles subnormals as zero, which differs from Arm, so we can't use it here.
Operand res = context.AddIntrinsic(Intrinsic.X86Sqrtss, GetVec(op.Rn));
res = context.AddIntrinsic(Intrinsic.X86Rcpss, res);
res = EmitSse41Round32Exp8OpF(context, res, scalar: true);
context.Copy(GetVec(op.Rd), context.VectorZeroUpper96(res)); context.Copy(GetVec(op.Rd), context.VectorZeroUpper96(res));
} }
@ -2451,7 +2455,11 @@ namespace ARMeilleure.Instructions
} }
else if (Optimizations.FastFP && Optimizations.UseSse41 && sizeF == 0) else if (Optimizations.FastFP && Optimizations.UseSse41 && sizeF == 0)
{ {
Operand res = EmitSse41Round32Exp8OpF(context, context.AddIntrinsic(Intrinsic.X86Rsqrtps, GetVec(op.Rn)), scalar: false); // RSQRTPS handles subnormals as zero, which differs from Arm, so we can't use it here.
Operand res = context.AddIntrinsic(Intrinsic.X86Sqrtps, GetVec(op.Rn));
res = context.AddIntrinsic(Intrinsic.X86Rcpps, res);
res = EmitSse41Round32Exp8OpF(context, res, scalar: false);
if (op.RegisterSize == RegisterSize.Simd64) if (op.RegisterSize == RegisterSize.Simd64)
{ {