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Fix infinite loop in kiss_fft_next_fast_size for n<=0 (issue #121)

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kiss_fft_next_fast_size(0) never terminated because the factorization
loop divides m by 2/3/5 forever when m stays 0. Per maintainer decision,
return 1 for n<=0. Add regression test next_fast_size covering n=0,
n<0 and positive inputs.
This commit is contained in:
zhouyunding
2026-10-21 20:05:00 +08:00
parent 2a1f133716
commit 80aec22623
3 changed files with 43 additions and 0 deletions
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test/CMakeLists.txt
+2
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@@ -49,6 +49,8 @@ target_compile_definitions(tkfc PRIVATE KFC_TEST)
add_kissfft_test_executable(ffr twotonetest.c)
add_kissfft_test_executable(tr test_real.c)
add_kissfft_test_executable(next_fast_size next_fast_size.c)
add_kissfft_test_executable(testcpp testcpp.cc)
if(KISSFFT_DATATYPE MATCHES "^simd$")