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liblzma: Fix a comment in the RISC-V filter.

This commit is contained in:
Lasse Collin 2024-03-04 19:23:18 +02:00 committed by Jia Tan
parent 319cec142f
commit e98ddaf85a
1 changed files with 2 additions and 2 deletions
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4
src/liblzma/simple/riscv.c
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@ -320,11 +320,11 @@ AUIPC with rd == x0
// The left-hand side takes care of (1) and (2).
// (a) The lowest 7 bits are already known to be AUIPC so subtracting 0x17
// makes those bits zeros.
// (b) If AUIPC rd equals x2, subtracting 0x10 makes bits [11:7] zeros.
// (b) If AUIPC rd equals x2, subtracting 0x100 makes bits [11:7] zeros.
// If rd doesn't equal x2, then there will be at least one non-zero bit
// and the next step (c) is irrelevant.
// (c) If the lowest two opcode bits of the packed inst2 are set in [13:12],
// then subtracting 0x300 will make those bits zeros. Otherwise there
// then subtracting 0x3000 will make those bits zeros. Otherwise there
// will be at least one non-zero bit.
//
// The shift by 18 removes the high bits from the final '>=' comparison and