derek.holloway
7502bf64a4
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97 lines
3.8 KiB
MLIR
97 lines
3.8 KiB
MLIR
// RUN: mlir-opt %s -arith-expand=include-flush-denormals=true -split-input-file | FileCheck %s
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// Expansion for f32:
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// exp mask = 0x7f800000 (sign 0, exp all 1, mantissa 0)
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// clear-man mask = 0xff800000 (sign 1, exp all 1, mantissa 0)
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// When the exponent field is zero (±0 or denormal), the mantissa bits are
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// cleared, yielding a sign-preserved zero. Otherwise the bits pass through.
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// CHECK-LABEL: func @flush_denormals_f32
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// CHECK-SAME: (%[[ARG0:.+]]: f32) -> f32
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// CHECK: %[[BITS:.+]] = arith.bitcast %[[ARG0]] : f32 to i32
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// CHECK: %[[EXP_MASK:.+]] = arith.constant 2139095040 : i32
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// CHECK: %[[CLEAR_MAN_MASK:.+]] = arith.constant -8388608 : i32
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// CHECK: %[[ZERO:.+]] = arith.constant 0 : i32
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// CHECK: %[[EXP:.+]] = arith.andi %[[BITS]], %[[EXP_MASK]] : i32
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// CHECK: %[[EXP_ZERO:.+]] = arith.cmpi eq, %[[EXP]], %[[ZERO]] : i32
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// CHECK: %[[CLEARED:.+]] = arith.andi %[[BITS]], %[[CLEAR_MAN_MASK]] : i32
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// CHECK: %[[RES_BITS:.+]] = arith.select %[[EXP_ZERO]], %[[CLEARED]], %[[BITS]] : i32
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// CHECK: %[[RES:.+]] = arith.bitcast %[[RES_BITS]] : i32 to f32
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// CHECK: return %[[RES]] : f32
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func.func @flush_denormals_f32(%arg0: f32) -> f32 {
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%0 = arith.flush_denormals %arg0 : f32
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return %0 : f32
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}
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// -----
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// Expansion for bf16:
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// exp mask = 0x7f80
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// clear-man mask = 0xff80 (-128 as signed i16)
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// CHECK-LABEL: func @flush_denormals_bf16
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// CHECK: arith.bitcast %{{.*}} : bf16 to i16
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// CHECK: %[[EXP_MASK:.+]] = arith.constant 32640 : i16
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// CHECK: %[[CLEAR_MAN_MASK:.+]] = arith.constant -128 : i16
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// CHECK: arith.bitcast %{{.*}} : i16 to bf16
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func.func @flush_denormals_bf16(%arg0: bf16) -> bf16 {
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%0 = arith.flush_denormals %arg0 : bf16
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return %0 : bf16
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}
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// -----
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// Expansion for f16:
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// exp mask = 0x7c00
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// clear-man mask = 0xfc00 (-1024 as signed i16)
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// CHECK-LABEL: func @flush_denormals_f16
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// CHECK: arith.bitcast %{{.*}} : f16 to i16
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// CHECK: %[[EXP_MASK:.+]] = arith.constant 31744 : i16
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// CHECK: %[[CLEAR_MAN_MASK:.+]] = arith.constant -1024 : i16
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// CHECK: arith.bitcast %{{.*}} : i16 to f16
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func.func @flush_denormals_f16(%arg0: f16) -> f16 {
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%0 = arith.flush_denormals %arg0 : f16
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return %0 : f16
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}
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// -----
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// Expansion for f64 (verifies wide APInt masks work):
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// exp mask = 0x7ff0000000000000 = 9218868437227405312
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// clear-man mask = 0xfff0000000000000 = -4503599627370496 (signed i64)
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// CHECK-LABEL: func @flush_denormals_f64
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// CHECK: arith.bitcast %{{.*}} : f64 to i64
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// CHECK: %[[EXP_MASK:.+]] = arith.constant 9218868437227405312 : i64
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// CHECK: %[[CLEAR_MAN_MASK:.+]] = arith.constant -4503599627370496 : i64
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// CHECK: arith.bitcast %{{.*}} : i64 to f64
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func.func @flush_denormals_f64(%arg0: f64) -> f64 {
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%0 = arith.flush_denormals %arg0 : f64
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return %0 : f64
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}
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// -----
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// CHECK-LABEL: func @flush_denormals_vector
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// CHECK: arith.bitcast %{{.*}} : vector<4xf32> to vector<4xi32>
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// CHECK: arith.andi %{{.*}} : vector<4xi32>
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// CHECK: arith.cmpi eq, %{{.*}} : vector<4xi32>
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// CHECK: arith.andi %{{.*}} : vector<4xi32>
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// CHECK: arith.select %{{.*}}, %{{.*}}, %{{.*}} : vector<4xi1>, vector<4xi32>
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// CHECK: arith.bitcast %{{.*}} : vector<4xi32> to vector<4xf32>
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func.func @flush_denormals_vector(%arg0: vector<4xf32>) -> vector<4xf32> {
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%0 = arith.flush_denormals %arg0 : vector<4xf32>
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return %0 : vector<4xf32>
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}
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// -----
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// CHECK-LABEL: func @flush_denormals_tensor
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// CHECK: arith.bitcast %{{.*}} : tensor<8xf32> to tensor<8xi32>
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// CHECK: arith.bitcast %{{.*}} : tensor<8xi32> to tensor<8xf32>
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func.func @flush_denormals_tensor(%arg0: tensor<8xf32>) -> tensor<8xf32> {
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%0 = arith.flush_denormals %arg0 : tensor<8xf32>
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return %0 : tensor<8xf32>
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}
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