diff --git a/CHANGELOG.md b/CHANGELOG.md index a11365bb9c2..49d90aaae4b 100644 --- a/CHANGELOG.md +++ b/CHANGELOG.md @@ -6,6 +6,8 @@ Blocks of changes will separated by version increments. ## **[Unreleased]** +- [#863](https://github.com/wasmerio/wasmer/pull/863) Fix min and max for cases involving NaN and negative zero when using the LLVM backend. + ## 0.8.0 - 2019-10-02 Special thanks to @jdanford for their contributions! diff --git a/lib/llvm-backend/src/code.rs b/lib/llvm-backend/src/code.rs index 8ac76fe269b..13dcd2bd9b3 100644 --- a/lib/llvm-backend/src/code.rs +++ b/lib/llvm-backend/src/code.rs @@ -2692,86 +2692,404 @@ impl FunctionCodeGenerator for LLVMFunctionCodeGenerator { state.push1(bits); } Operator::F32Min => { + // This implements the same logic as LLVM's @llvm.minimum + // intrinsic would, but x86 lowering of that intrinsics + // encounters a fatal error in LLVM 8 and LLVM 9. let (v1, v2) = state.pop2()?; - let res = builder - .build_call(intrinsics.minimum_f32, &[v1, v2], &state.var_name()) - .try_as_basic_value() - .left() - .unwrap(); + let v1 = canonicalize_nans(builder, intrinsics, v1); + let v2 = canonicalize_nans(builder, intrinsics, v2); + let (v1, v2) = (v1.into_float_value(), v2.into_float_value()); + let v1_is_nan = builder.build_float_compare( + FloatPredicate::UNO, + v1, + intrinsics.f32_zero, + "nan", + ); + let v2_is_not_nan = builder.build_float_compare( + FloatPredicate::ORD, + v2, + intrinsics.f32_zero, + "notnan", + ); + let v1_repr = builder + .build_bitcast(v1, intrinsics.i32_ty, "") + .into_int_value(); + let v2_repr = builder + .build_bitcast(v2, intrinsics.i32_ty, "") + .into_int_value(); + let repr_ne = builder.build_int_compare(IntPredicate::NE, v1_repr, v2_repr, ""); + let float_eq = builder.build_float_compare(FloatPredicate::OEQ, v1, v2, ""); + let min_cmp = builder.build_float_compare(FloatPredicate::OLT, v1, v2, ""); + let negative_zero = intrinsics.f32_ty.const_float(-0.0); + let v2 = builder + .build_select( + builder.build_and( + builder.build_and(float_eq, repr_ne, ""), + v2_is_not_nan, + "", + ), + negative_zero, + v2, + "", + ) + .into_float_value(); + let res = + builder.build_select(builder.build_or(v1_is_nan, min_cmp, ""), v1, v2, ""); state.push1(res); } Operator::F64Min => { + // This implements the same logic as LLVM's @llvm.minimum + // intrinsic would, but x86 lowering of that intrinsics + // encounters a fatal error in LLVM 8 and LLVM 9. let (v1, v2) = state.pop2()?; - let res = builder - .build_call(intrinsics.minimum_f64, &[v1, v2], &state.var_name()) - .try_as_basic_value() - .left() - .unwrap(); + let v1 = canonicalize_nans(builder, intrinsics, v1); + let v2 = canonicalize_nans(builder, intrinsics, v2); + let (v1, v2) = (v1.into_float_value(), v2.into_float_value()); + let v1_is_nan = builder.build_float_compare( + FloatPredicate::UNO, + v1, + intrinsics.f64_zero, + "nan", + ); + let v2_is_not_nan = builder.build_float_compare( + FloatPredicate::ORD, + v2, + intrinsics.f64_zero, + "notnan", + ); + let v1_repr = builder + .build_bitcast(v1, intrinsics.i64_ty, "") + .into_int_value(); + let v2_repr = builder + .build_bitcast(v2, intrinsics.i64_ty, "") + .into_int_value(); + let repr_ne = builder.build_int_compare(IntPredicate::NE, v1_repr, v2_repr, ""); + let float_eq = builder.build_float_compare(FloatPredicate::OEQ, v1, v2, ""); + let min_cmp = builder.build_float_compare(FloatPredicate::OLT, v1, v2, ""); + let negative_zero = intrinsics.f64_ty.const_float(-0.0); + let v2 = builder + .build_select( + builder.build_and( + builder.build_and(float_eq, repr_ne, ""), + v2_is_not_nan, + "", + ), + negative_zero, + v2, + "", + ) + .into_float_value(); + let res = + builder.build_select(builder.build_or(v1_is_nan, min_cmp, ""), v1, v2, ""); state.push1(res); } Operator::F32x4Min => { + // This implements the same logic as LLVM's @llvm.minimum + // intrinsic would, but x86 lowering of that intrinsics + // encounters a fatal error in LLVM 8 and LLVM 9. let (v1, v2) = state.pop2()?; let v1 = builder.build_bitcast(v1, intrinsics.f32x4_ty, ""); let v2 = builder.build_bitcast(v2, intrinsics.f32x4_ty, ""); - let res = builder - .build_call(intrinsics.minimum_f32x4, &[v1, v2], &state.var_name()) - .try_as_basic_value() - .left() - .unwrap(); + let v1 = canonicalize_nans(builder, intrinsics, v1); + let v2 = canonicalize_nans(builder, intrinsics, v2); + let (v1, v2) = (v1.into_vector_value(), v2.into_vector_value()); + let v1_is_nan = builder.build_float_compare( + FloatPredicate::UNO, + v1, + intrinsics.f32x4_zero, + "nan", + ); + let v2_is_not_nan = builder.build_float_compare( + FloatPredicate::ORD, + v2, + intrinsics.f32x4_zero, + "notnan", + ); + let v1_repr = builder + .build_bitcast(v1, intrinsics.i32x4_ty, "") + .into_vector_value(); + let v2_repr = builder + .build_bitcast(v2, intrinsics.i32x4_ty, "") + .into_vector_value(); + let repr_ne = builder.build_int_compare(IntPredicate::NE, v1_repr, v2_repr, ""); + let float_eq = builder.build_float_compare(FloatPredicate::OEQ, v1, v2, ""); + let min_cmp = builder.build_float_compare(FloatPredicate::OLT, v1, v2, ""); + let negative_zero = splat_vector( + builder, + intrinsics, + intrinsics.f32_ty.const_float(-0.0).as_basic_value_enum(), + intrinsics.f32x4_ty, + "", + ); + let v2 = builder + .build_select( + builder.build_and( + builder.build_and(float_eq, repr_ne, ""), + v2_is_not_nan, + "", + ), + negative_zero, + v2, + "", + ) + .into_vector_value(); + let res = + builder.build_select(builder.build_or(v1_is_nan, min_cmp, ""), v1, v2, ""); let res = builder.build_bitcast(res, intrinsics.i128_ty, ""); state.push1(res); } Operator::F64x2Min => { + // This implements the same logic as LLVM's @llvm.minimum + // intrinsic would, but x86 lowering of that intrinsics + // encounters a fatal error in LLVM 8 and LLVM 9. let (v1, v2) = state.pop2()?; let v1 = builder.build_bitcast(v1, intrinsics.f64x2_ty, ""); let v2 = builder.build_bitcast(v2, intrinsics.f64x2_ty, ""); - let res = builder - .build_call(intrinsics.minimum_f64x2, &[v1, v2], &state.var_name()) - .try_as_basic_value() - .left() - .unwrap(); + let v1 = canonicalize_nans(builder, intrinsics, v1); + let v2 = canonicalize_nans(builder, intrinsics, v2); + let (v1, v2) = (v1.into_vector_value(), v2.into_vector_value()); + let v1_is_nan = builder.build_float_compare( + FloatPredicate::UNO, + v1, + intrinsics.f64x2_zero, + "nan", + ); + let v2_is_not_nan = builder.build_float_compare( + FloatPredicate::ORD, + v2, + intrinsics.f64x2_zero, + "notnan", + ); + let v1_repr = builder + .build_bitcast(v1, intrinsics.i64x2_ty, "") + .into_vector_value(); + let v2_repr = builder + .build_bitcast(v2, intrinsics.i64x2_ty, "") + .into_vector_value(); + let repr_ne = builder.build_int_compare(IntPredicate::NE, v1_repr, v2_repr, ""); + let float_eq = builder.build_float_compare(FloatPredicate::OEQ, v1, v2, ""); + let min_cmp = builder.build_float_compare(FloatPredicate::OLT, v1, v2, ""); + let negative_zero = splat_vector( + builder, + intrinsics, + intrinsics.f64_ty.const_float(-0.0).as_basic_value_enum(), + intrinsics.f64x2_ty, + "", + ); + let v2 = builder + .build_select( + builder.build_and( + builder.build_and(float_eq, repr_ne, ""), + v2_is_not_nan, + "", + ), + negative_zero, + v2, + "", + ) + .into_vector_value(); + let res = + builder.build_select(builder.build_or(v1_is_nan, min_cmp, ""), v1, v2, ""); let res = builder.build_bitcast(res, intrinsics.i128_ty, ""); state.push1(res); } Operator::F32Max => { + // This implements the same logic as LLVM's @llvm.maximum + // intrinsic would, but x86 lowering of that intrinsics + // encounters a fatal error in LLVM 8 and LLVM 9. let (v1, v2) = state.pop2()?; - let res = builder - .build_call(intrinsics.maximum_f32, &[v1, v2], &state.var_name()) - .try_as_basic_value() - .left() - .unwrap(); + let v1 = canonicalize_nans(builder, intrinsics, v1); + let v2 = canonicalize_nans(builder, intrinsics, v2); + let (v1, v2) = (v1.into_float_value(), v2.into_float_value()); + let v1_is_nan = builder.build_float_compare( + FloatPredicate::UNO, + v1, + intrinsics.f32_zero, + "nan", + ); + let v2_is_not_nan = builder.build_float_compare( + FloatPredicate::ORD, + v2, + intrinsics.f32_zero, + "notnan", + ); + let v1_repr = builder + .build_bitcast(v1, intrinsics.i32_ty, "") + .into_int_value(); + let v2_repr = builder + .build_bitcast(v2, intrinsics.i32_ty, "") + .into_int_value(); + let repr_ne = builder.build_int_compare(IntPredicate::NE, v1_repr, v2_repr, ""); + let float_eq = builder.build_float_compare(FloatPredicate::OEQ, v1, v2, ""); + let min_cmp = builder.build_float_compare(FloatPredicate::OGT, v1, v2, ""); + let v2 = builder + .build_select( + builder.build_and( + builder.build_and(float_eq, repr_ne, ""), + v2_is_not_nan, + "", + ), + intrinsics.f32_zero, + v2, + "", + ) + .into_float_value(); + let res = + builder.build_select(builder.build_or(v1_is_nan, min_cmp, ""), v1, v2, ""); state.push1(res); } Operator::F64Max => { + // This implements the same logic as LLVM's @llvm.maximum + // intrinsic would, but x86 lowering of that intrinsics + // encounters a fatal error in LLVM 8 and LLVM 9. let (v1, v2) = state.pop2()?; - let res = builder - .build_call(intrinsics.maximum_f64, &[v1, v2], &state.var_name()) - .try_as_basic_value() - .left() - .unwrap(); + let v1 = canonicalize_nans(builder, intrinsics, v1); + let v2 = canonicalize_nans(builder, intrinsics, v2); + let (v1, v2) = (v1.into_float_value(), v2.into_float_value()); + let v1_is_nan = builder.build_float_compare( + FloatPredicate::UNO, + v1, + intrinsics.f64_zero, + "nan", + ); + let v2_is_not_nan = builder.build_float_compare( + FloatPredicate::ORD, + v2, + intrinsics.f64_zero, + "notnan", + ); + let v1_repr = builder + .build_bitcast(v1, intrinsics.i64_ty, "") + .into_int_value(); + let v2_repr = builder + .build_bitcast(v2, intrinsics.i64_ty, "") + .into_int_value(); + let repr_ne = builder.build_int_compare(IntPredicate::NE, v1_repr, v2_repr, ""); + let float_eq = builder.build_float_compare(FloatPredicate::OEQ, v1, v2, ""); + let min_cmp = builder.build_float_compare(FloatPredicate::OGT, v1, v2, ""); + let v2 = builder + .build_select( + builder.build_and( + builder.build_and(float_eq, repr_ne, ""), + v2_is_not_nan, + "", + ), + intrinsics.f64_zero, + v2, + "", + ) + .into_float_value(); + let res = + builder.build_select(builder.build_or(v1_is_nan, min_cmp, ""), v1, v2, ""); state.push1(res); } Operator::F32x4Max => { + // This implements the same logic as LLVM's @llvm.maximum + // intrinsic would, but x86 lowering of that intrinsics + // encounters a fatal error in LLVM 8 and LLVM 9. let (v1, v2) = state.pop2()?; let v1 = builder.build_bitcast(v1, intrinsics.f32x4_ty, ""); let v2 = builder.build_bitcast(v2, intrinsics.f32x4_ty, ""); - let res = builder - .build_call(intrinsics.maximum_f32x4, &[v1, v2], &state.var_name()) - .try_as_basic_value() - .left() - .unwrap(); + let v1 = canonicalize_nans(builder, intrinsics, v1); + let v2 = canonicalize_nans(builder, intrinsics, v2); + let (v1, v2) = (v1.into_vector_value(), v2.into_vector_value()); + let v1_is_nan = builder.build_float_compare( + FloatPredicate::UNO, + v1, + intrinsics.f32x4_zero, + "nan", + ); + let v2_is_not_nan = builder.build_float_compare( + FloatPredicate::ORD, + v2, + intrinsics.f32x4_zero, + "notnan", + ); + let v1_repr = builder + .build_bitcast(v1, intrinsics.i32x4_ty, "") + .into_vector_value(); + let v2_repr = builder + .build_bitcast(v2, intrinsics.i32x4_ty, "") + .into_vector_value(); + let repr_ne = builder.build_int_compare(IntPredicate::NE, v1_repr, v2_repr, ""); + let float_eq = builder.build_float_compare(FloatPredicate::OEQ, v1, v2, ""); + let min_cmp = builder.build_float_compare(FloatPredicate::OGT, v1, v2, ""); + let zero = splat_vector( + builder, + intrinsics, + intrinsics.f32_zero.as_basic_value_enum(), + intrinsics.f32x4_ty, + "", + ); + let v2 = builder + .build_select( + builder.build_and( + builder.build_and(float_eq, repr_ne, ""), + v2_is_not_nan, + "", + ), + zero, + v2, + "", + ) + .into_vector_value(); + let res = + builder.build_select(builder.build_or(v1_is_nan, min_cmp, ""), v1, v2, ""); let res = builder.build_bitcast(res, intrinsics.i128_ty, ""); state.push1(res); } Operator::F64x2Max => { + // This implements the same logic as LLVM's @llvm.maximum + // intrinsic would, but x86 lowering of that intrinsics + // encounters a fatal error in LLVM 8 and LLVM 9. let (v1, v2) = state.pop2()?; let v1 = builder.build_bitcast(v1, intrinsics.f64x2_ty, ""); let v2 = builder.build_bitcast(v2, intrinsics.f64x2_ty, ""); - let res = builder - .build_call(intrinsics.maximum_f64x2, &[v1, v2], &state.var_name()) - .try_as_basic_value() - .left() - .unwrap(); + let v1 = canonicalize_nans(builder, intrinsics, v1); + let v2 = canonicalize_nans(builder, intrinsics, v2); + let (v1, v2) = (v1.into_vector_value(), v2.into_vector_value()); + let v1_is_nan = builder.build_float_compare( + FloatPredicate::UNO, + v1, + intrinsics.f64x2_zero, + "nan", + ); + let v2_is_not_nan = builder.build_float_compare( + FloatPredicate::ORD, + v2, + intrinsics.f64x2_zero, + "notnan", + ); + let v1_repr = builder + .build_bitcast(v1, intrinsics.i64x2_ty, "") + .into_vector_value(); + let v2_repr = builder + .build_bitcast(v2, intrinsics.i64x2_ty, "") + .into_vector_value(); + let repr_ne = builder.build_int_compare(IntPredicate::NE, v1_repr, v2_repr, ""); + let float_eq = builder.build_float_compare(FloatPredicate::OEQ, v1, v2, ""); + let min_cmp = builder.build_float_compare(FloatPredicate::OGT, v1, v2, ""); + let zero = splat_vector( + builder, + intrinsics, + intrinsics.f64_zero.as_basic_value_enum(), + intrinsics.f64x2_ty, + "", + ); + let v2 = builder + .build_select( + builder.build_and( + builder.build_and(float_eq, repr_ne, ""), + v2_is_not_nan, + "", + ), + zero, + v2, + "", + ) + .into_vector_value(); + let res = + builder.build_select(builder.build_or(v1_is_nan, min_cmp, ""), v1, v2, ""); let res = builder.build_bitcast(res, intrinsics.i128_ty, ""); state.push1(res); } diff --git a/lib/llvm-backend/src/intrinsics.rs b/lib/llvm-backend/src/intrinsics.rs index 278e087bb41..afd3bf8ad2a 100644 --- a/lib/llvm-backend/src/intrinsics.rs +++ b/lib/llvm-backend/src/intrinsics.rs @@ -6,7 +6,9 @@ use inkwell::{ types::{ BasicType, FloatType, FunctionType, IntType, PointerType, StructType, VectorType, VoidType, }, - values::{BasicValue, BasicValueEnum, FloatValue, FunctionValue, IntValue, PointerValue}, + values::{ + BasicValue, BasicValueEnum, FloatValue, FunctionValue, IntValue, PointerValue, VectorValue, + }, AddressSpace, }; use std::collections::HashMap; @@ -125,6 +127,8 @@ pub struct Intrinsics { pub i128_zero: IntValue, pub f32_zero: FloatValue, pub f64_zero: FloatValue, + pub f32x4_zero: VectorValue, + pub f64x2_zero: VectorValue, pub trap_unreachable: BasicValueEnum, pub trap_call_indirect_sig: BasicValueEnum, @@ -191,6 +195,8 @@ impl Intrinsics { let i128_zero = i128_ty.const_int(0, false); let f32_zero = f32_ty.const_float(0.0); let f64_zero = f64_ty.const_float(0.0); + let f32x4_zero = f32x4_ty.const_zero(); + let f64x2_zero = f64x2_ty.const_zero(); let i1_ty_basic = i1_ty.as_basic_type_enum(); let i32_ty_basic = i32_ty.as_basic_type_enum(); @@ -455,6 +461,8 @@ impl Intrinsics { i128_zero, f32_zero, f64_zero, + f32x4_zero, + f64x2_zero, trap_unreachable: i32_zero.as_basic_value_enum(), trap_call_indirect_sig: i32_ty.const_int(1, false).as_basic_value_enum(), diff --git a/lib/spectests/tests/excludes.txt b/lib/spectests/tests/excludes.txt index 56c6a2d5613..cb641ea5361 100644 --- a/lib/spectests/tests/excludes.txt +++ b/lib/spectests/tests/excludes.txt @@ -265,554 +265,6 @@ clif:fail:data.wast:266:windows # AssertUnlinkable - caught panic Any clif:fail:data.wast:186:windows # AssertUnlinkable - caught panic Any clif:fail:data.wast:194:windows # AssertUnlinkable - caught panic Any -# LLVM bug with min/max over NaNs 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