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FFT: use host stack buffer in PlanCreate, not deviceVector

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Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
This commit is contained in:
Peter Boyle
2026-05-19 21:49:06 -04:00
parent dbbfdd4e4b
commit f08c755ae6
1 changed files with 4 additions and 2 deletions
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Grid/algorithms/FFT.h
+4 -2
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@@ -275,8 +275,10 @@ public:
// GPU backends (cuFFT/hipFFT) ignore the buffer pointer at plan creation. // GPU backends (cuFFT/hipFFT) ignore the buffer pointer at plan creation.
// CPU FFTW with FFTW_ESTIMATE inspects only alignment and never touches data. // CPU FFTW with FFTW_ESTIMATE inspects only alignment and never touches data.
deviceVector<scalar> dummy(2); // Use a host stack buffer: a device allocation here triggers a rocFFT RTC
FFTW_scalar *buf = (FFTW_scalar *)&dummy[0]; // bug on ROCm 7 that causes plan creation to fail for small transform sizes.
scalar stack_dummy[2] = {};
FFTW_scalar *buf = (FFTW_scalar *)stack_dummy;
{ {
FFTW_plan p = FFTW<scalar>::fftw_plan_many_dft( FFTW_plan p = FFTW<scalar>::fftw_plan_many_dft(