author | Jan Vrany <jan.vrany@fit.cvut.cz> |
Tue, 11 Jun 2019 22:03:11 +0100 | |
changeset 3914 | 35aa88fa58c1 |
parent 2380 | 9195eccdcbd9 |
permissions | -rw-r--r-- |
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Updated to https://swing.fit.cvut.cz/hg/stx.libjava/rev/31f8b995905e
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21 Oct 2002 |
fa7400d022a0
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bug fix in e_pow.c from "David G Hough at validlab.com" <validlab@validlab.com>. |
fa7400d022a0
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credit for bug report goes to andrew_johnson@uk.ibm.com |
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test example: |
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----------------------------- |
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static int fail=0; |
fa7400d022a0
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|
fa7400d022a0
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trypow(x,y,z) |
fa7400d022a0
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double x,y,z; |
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{ |
fa7400d022a0
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extern double pow(); |
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double p ; |
fa7400d022a0
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|
fa7400d022a0
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p = pow(x,y); |
fa7400d022a0
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if (p != z) { |
fa7400d022a0
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printf(" pow failure x %e y %e computed %e correct %e \n",x,y,p,z); |
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fail++; |
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return; |
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} |
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if (1/p != 1/z) { |
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printf(" pow failure x %e y %e computed %e correct %e \n",x,y,p,z); |
fa7400d022a0
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fail++; |
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return; |
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} |
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} |
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|
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main() |
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{ |
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|
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trypow( 1.0000000001, 1.0000000001E10, 2.7182820535066154); |
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trypow(-1.0000000001, 1.0000000001E10, -2.7182820535066154); |
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trypow(-0.001, 1.0000000001E10, -0.0); |
fa7400d022a0
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trypow(-1000.0, 1.0000000001E10, -1.0/0.0); |
fa7400d022a0
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|
fa7400d022a0
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if (fail == 0) { |
fa7400d022a0
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printf(" fdlibm e_pow.c seems to be current \n"); |
fa7400d022a0
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exit(0); |
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} |
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else { |
fa7400d022a0
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printf(" fdlibm e_pow.c seems to be out of date \n"); |
fa7400d022a0
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exit(1); |
fa7400d022a0
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} |
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} |
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----------------------------- |
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What's new in FDLIBM 5.3? |
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CONFIGURE |
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To build FDLIBM, edit the supplied Makefile or create |
fa7400d022a0
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a local Makefile by running "sh configure" |
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using the supplied configure script contributed by Nelson Beebe |
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BUGS FIXED |
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1. e_pow.c incorrect results when |
fa7400d022a0
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x is very close to -1.0 and y is very large, e.g. |
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pow(-1.0000000000000002e+00,4.5035996273704970e+15) = 0 |
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pow(-9.9999999999999978e-01,4.5035996273704970e+15) = 0 |
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Correct results are close to -e and -1/e. |
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|
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2. k_tan.c error was > 1 ulp target for FDLIBM |
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5.2: Worst error at least 1.45 ulp at |
fa7400d022a0
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tan(1.7765241907548024E+269) = 1.7733884462610958E+16 |
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5.3: Worst error 0.96 ulp |
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|
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NOT FIXED YET |
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|
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3. Compiler failure on non-standard code |
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72 |
Statements like |
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*(1+(int*)&t1) = 0; |
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are not standard C and cause some optimizing compilers (e.g. GCC) |
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to generate bad code under optimization. These cases |
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are to be addressed in the next release. |
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77 |