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https://github.com/cirosantilli/linux-kernel-module-cheat.git
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60 lines
1.8 KiB
ArmAsm
60 lines
1.8 KiB
ArmAsm
/* https://cirosantilli.com/linux-kernel-module-cheat#ieee-754 */
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#include <lkmc.h>
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#include <lkmc/float.h>
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.data
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double_1_5: .quad LKMC_FLOAT_64(0x0, 0x0, 0x8000000000000)
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double_2_5: .quad LKMC_FLOAT_64(0x0, 0x1, 0x4000000000000)
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double_4_0: .quad LKMC_FLOAT_64(0x0, 0x2, 0x0000000000000)
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double_minus_4_0: .quad LKMC_FLOAT_64(0x1, 0x2, 0x10000000000000)
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double_plus_infinity: .quad LKMC_FLOAT_64_PLUS_INFINITY
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double_nan: .quad LKMC_FLOAT_64_QNAN_DEFAULT
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double_ref_1_5: .double 1.5
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double_ref_2_5: .double 2.5
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double_ref_4_0: .double 4.0
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double_ref_minus_4_0: .double -4.0
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double_ref_plus_infinity: .double inf
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double_ref_nan: .double nan
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LKMC_PROLOGUE
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/* Check that our macros are correct. */
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LKMC_ASSERT_EQ(double_1_5, double_ref_1_5)
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LKMC_ASSERT_EQ(double_2_5, double_ref_2_5)
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LKMC_ASSERT_EQ(double_4_0, double_ref_4_0)
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LKMC_ASSERT_EQ(double_minus_4_0, double_ref_minus_4_0)
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LKMC_ASSERT_EQ(double_plus_infinity, double_ref_plus_infinity)
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/* TODO: GAS nan is a different NaN: 0x7FFFFFFF */
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/*LKMC_ASSERT_EQ(double_nan, double_ref_nan)*/
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/* x87 80-bit FPU: https://cirosantilli.com/linux-kernel-module-cheat#x86-x87-fpu-instructions */
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/* 1.5 + 2.5 == 4.0. */
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fldl double_1_5
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fldl double_2_5
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faddp %st, %st(1)
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fldl double_4_0
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fcomip %st(1)
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LKMC_ASSERT(je)
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/* 4.0 + -4.0 == 0.0. */
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fldl double_minus_4_0
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faddp %st, %st(1)
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fldz
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fcomip %st(1)
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LKMC_ASSERT(je)
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/* 0.0 + inf == inf */
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fldl double_plus_infinity
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faddp %st, %st(1)
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fldl double_plus_infinity
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fcomip %st(1)
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LKMC_ASSERT(je)
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/* inf + nan == nan */
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fldl double_nan
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faddp %st, %st(1)
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fldl double_nan
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fcomip %st(1)
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LKMC_ASSERT(je)
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LKMC_EPILOGUE
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