mirror of
https://github.com/Zenithsiz/ftmemsim-valgrind.git
synced 2026-02-03 18:13:01 +00:00
04cdc29b00
The arm64 frontend used to implement the scalar fmadd, fmsub, fnmadd
and fnmsub iinstructions into separate addition/substraction and
multiplication instructions, which caused rounding issues.
This patch turns them into Iop_M{Add,Sub}F{32,64} instructions
(with some arguments negated). And the backend now emits fmadd or fmsub
instructions.
Alexandra Hajkova <ahajkova@redhat.com> added tests and fixed up the
implementation to make sure rounding (and sign) are correct now.
https://bugs.kde.org/show_bug.cgi?id=426014
126 lines
4.7 KiB
Plaintext
126 lines
4.7 KiB
Plaintext
FMADD 32bit: dst = z + x * y
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76.246193 = 38.123096 + 55.000000 * 0.693147
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dst = 42987e0d = 76.246192932128906
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FNMADD 32bit: dst = -z + (-x) * y
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-76.246193 = -38.123096 + (-55.000000) * 0.693147
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dst = c2987e0d = -76.246192932128906
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FMSUB 32bit: dst = z + (-x) * y
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0.000001 = 38.123096 + (-55.000000) * 0.693147
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dst = 35c00000 = 1.430511474609375e-06
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FNMSUB 32bit: dst = -z + x * y
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-0.000001 = -38.123096 + 55.000000 * 0.693147
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dst = b5c00000 = -1.430511474609375e-06
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FMADD 64bit: dst = z + x * y
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76.246190 = 38.123095 + 55.000000 * 0.693147
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dst = 40530fc1931f09c9 = 76.246189861593976
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FNMADD 64bit: dst = -z + (-x) * y
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-76.246190 = -38.123095 - 55.000000 * 0.693147
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dst = c0530fc1931f09c9 = -76.246189861593976
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FMSUB 64bit: dst = z + (-x) * y
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-0.000000 = 38.123095 + (-55.000000) * 0.693147
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dst = bce9000000000000 = -2.7755575615628914e-15
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FNMSUB 64bit: dst = -z + x * y
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0.000000 = -38.123095 + 55.000000 * 0.693147
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dst = 3ce9000000000000 = 2.7755575615628914e-15
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FMADD 32bit: dst = z + x * y
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1.996086 = 1.000000 + 0.980762 * 1.015625
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dst = 3fff7fc0 = 1.9960861206054688
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FNMADD 32bit: dst = -z + (-x) * y
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-1.996086 = -1.000000 + (-0.980762) * 1.015625
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dst = bfff7fc0 = -1.9960861206054688
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FMSUB 32bit: dst = z + (-x) * y
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0.003914 = 1.000000 + (-0.980762) * 1.015625
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dst = 3b80401a = 0.00391389150172472
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FNMSUB 32bit: dst = -z + x * y
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-0.003914 = -1.000000 + 0.980762 * 1.015625
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dst = bb80401a = -0.00391389150172472
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FMADD 64bit: dst = z + x * y
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1.996086 = 1.000000 + 0.980762 * 1.015625
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dst = 3fffeff800000000 = 1.9960861206054688
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FNMADD 64bit: dst = -z + (-x) * y
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-1.996086 = -1.000000 - 0.980762 * 1.015625
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dst = bfffeff800000000 = -1.9960861206054688
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FMSUB 64bit: dst = z + (-x) * y
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0.003914 = 1.000000 + (-0.980762) * 1.015625
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dst = 3f70080000000034 = 0.0039138793945312951
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FNMSUB 64bit: dst = -z + x * y
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-0.003914 = -1.000000 + 0.980762 * 1.015625
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dst = bf70080000000034 = -0.0039138793945312951
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FMADD 32bit: dst = z + x * y
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0.000000 = 0.000000 + 0.000000 * 0.000000
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dst = 00000000 = 0
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FNMADD 32bit: dst = -z + (-x) * y
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-0.000000 = -0.000000 + (-0.000000) * 0.000000
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dst = 80000000 = -0
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FMSUB 32bit: dst = z + (-x) * y
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0.000000 = 0.000000 + (-0.000000) * 0.000000
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dst = 00000000 = 0
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FNMSUB 32bit: dst = -z + x * y
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0.000000 = -0.000000 + 0.000000 * 0.000000
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dst = 00000000 = 0
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FMADD 64bit: dst = z + x * y
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0.000000 = 0.000000 + 0.000000 * 0.000000
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dst = 0000000000000000 = 0
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FNMADD 64bit: dst = -z + (-x) * y
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-0.000000 = -0.000000 - 0.000000 * 0.000000
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dst = 8000000000000000 = -0
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FMSUB 64bit: dst = z + (-x) * y
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0.000000 = 0.000000 + (-0.000000) * 0.000000
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dst = 0000000000000000 = 0
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FNMSUB 64bit: dst = -z + x * y
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0.000000 = -0.000000 + 0.000000 * 0.000000
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dst = 0000000000000000 = 0
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FMADD 32bit: dst = z + x * y
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2.000000 = 1.000000 + 1.000000 * 1.000000
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dst = 40000000 = 2
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FNMADD 32bit: dst = -z + (-x) * y
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-2.000000 = -1.000000 + (-1.000000) * 1.000000
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dst = c0000000 = -2
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FMSUB 32bit: dst = z + (-x) * y
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0.000000 = 1.000000 + (-1.000000) * 1.000000
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dst = 00000000 = 0
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FNMSUB 32bit: dst = -z + x * y
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0.000000 = -1.000000 + 1.000000 * 1.000000
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dst = 00000000 = 0
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FMADD 64bit: dst = z + x * y
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2.000000 = 1.000000 + 1.000000 * 1.000000
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dst = 4000000000000000 = 2
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FNMADD 64bit: dst = -z + (-x) * y
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-2.000000 = -1.000000 - 1.000000 * 1.000000
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dst = c000000000000000 = -2
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FMSUB 64bit: dst = z + (-x) * y
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0.000000 = 1.000000 + (-1.000000) * 1.000000
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dst = 0000000000000000 = 0
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FNMSUB 64bit: dst = -z + x * y
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0.000000 = -1.000000 + 1.000000 * 1.000000
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dst = 0000000000000000 = 0
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FMADD 32bit: dst = z + x * y
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18446744073709551616.000000 = 4294967296.000000 + 4294967296.000000 * 4294967296.000000
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dst = 5f800000 = 1.8446744073709552e+19
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FNMADD 32bit: dst = -z + (-x) * y
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-18446744073709551616.000000 = -4294967296.000000 + (-4294967296.000000) * 4294967296.000000
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dst = df800000 = -1.8446744073709552e+19
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FMSUB 32bit: dst = z + (-x) * y
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-18446744073709551616.000000 = 4294967296.000000 + (-4294967296.000000) * 4294967296.000000
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dst = df800000 = -1.8446744073709552e+19
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FNMSUB 32bit: dst = -z + x * y
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18446744073709551616.000000 = -4294967296.000000 + 4294967296.000000 * 4294967296.000000
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dst = 5f800000 = 1.8446744073709552e+19
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FMADD 64bit: dst = z + x * y
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18446744069414584320.000000 = 4294967295.000000 + 4294967295.000000 * 4294967295.000000
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dst = 43efffffffe00000 = 1.8446744069414584e+19
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FNMADD 64bit: dst = -z + (-x) * y
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-18446744069414584320.000000 = -4294967295.000000 - 4294967295.000000 * 4294967295.000000
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dst = c3efffffffe00000 = -1.8446744069414584e+19
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FMSUB 64bit: dst = z + (-x) * y
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-18446744060824649728.000000 = 4294967295.000000 + (-4294967295.000000) * 4294967295.000000
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dst = c3efffffffa00000 = -1.844674406082465e+19
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FNMSUB 64bit: dst = -z + x * y
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18446744060824649728.000000 = -4294967295.000000 + 4294967295.000000 * 4294967295.000000
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dst = 43efffffffa00000 = 1.844674406082465e+19
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