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:FLE

ISA

The Zfa extension adds a quiet NaN-handling variant of floating-point less-than-or-equal compare; FLE.S/.D/.H derive from RISC-V Zfa via sail-riscv commit f2d8e1b9.

First seen 9/27/2026
Last seen 9/27/2026
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WIKI

:FLE

FLE is a RISC-V floating-point instruction. The instructions FLE.H, FLE.S and FLE.D (the latter shortened to FLE for the single-precision case) perform a floating-point less-than-or-equal comparison.

Evidence from sail-riscv commit f2d8e1b9 (the Zfa extension patch) shows that quiet-NaN-handling siblings FLEQ.H, FLEQ.S, FLEQ.D and the LTQ family (FLTQ.H, FLTQ.S, FLTQ.D) are added by Zfa.''

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NEIGHBORHOOD

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RELATIONSHIPS

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FLEQ.H ← derived from 92% 1e
FLEQ is defined like FLE but quiet NaNs do not raise invalid operation.
FLEQ.S ← derived from 92% 1e
FLEQ is defined like FLE but quiet NaNs do not raise invalid operation.
FLEQ.D ← derived from 92% 1e
FLEQ is defined like FLE but quiet NaNs do not raise invalid operation.

CITATIONS

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2 citations — click to collapse
[1] FLEQ.H, FLEQ.S, FLEQ.D are added by the sail-riscv commit f2d8e1b9 introducing Zfa infrastructure plus .H/.S/.D instruction support. sail-riscv commit f2d8e1b9 ('Add Zfa extension support (excl. quad-precision)')
[2] FLEQ and FLTQ instructions are defined like the FLE and FLT instructions, except that quiet NaN inputs do not cause the invalid operation exception flag to be set. sail-riscv commit f2d8e1b9 ('Add Zfa extension support (excl. quad-precision)')