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Generate pow lookup tables with higher precision

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possibly due to glibc-2.29 commit 424c4f60ed6190e2ea0e72e0873bf3ebcbbf5448
pow is using fused-multiply-add (fma) if available.
That caused the fluidsynth binaries to differ depending on
the build machine's CPU.

This was visible among others in
grep '7.58577575029183[56]e-04' fluidsynth-2.0.3/build/fluid_conv_tables.c

See https://reproducible-builds.org/ for why this is matters.

Closes #512.
This commit is contained in:
Bernhard M. Wiedemann 2019-02-13 11:18:09 +01:00 committed by derselbst
parent 38ae851202
commit d25281d447
1 changed files with 2 additions and 2 deletions
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4
src/gentables/gen_conv.c
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@ -22,7 +22,7 @@ static void fluid_conversion_config(void)
for(i = 0; i < FLUID_CENTS_HZ_SIZE; i++)
{
fluid_ct2hz_tab[i] = pow(2.0, (double) i / 1200.0);
fluid_ct2hz_tab[i] = powl(2.0, (double) i / 1200.0);
}
/* centibels to amplitude conversion
@ -32,7 +32,7 @@ static void fluid_conversion_config(void)
*/
for(i = 0; i < FLUID_CB_AMP_SIZE; i++)
{
fluid_cb2amp_tab[i] = pow(10.0, (double) i / -200.0);
fluid_cb2amp_tab[i] = powl(10.0, (double) i / -200.0);
}
/* initialize the conversion tables (see fluid_mod.c