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[RISCV] Fix SiFive7 formula for Reductions and ordered Reductions #65385

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Merged
merged 1 commit into from
Sep 6, 2023
Merged

[RISCV] Fix SiFive7 formula for Reductions and ordered Reductions #65385

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6 changes: 3 additions & 3 deletions llvm/lib/Target/RISCV/RISCVSchedSiFive7.td
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Original file line number Diff line number Diff line change
Expand Up @@ -154,12 +154,12 @@ class SiFive7GetReductionCycles<string mx, int sew> {
!eq(mx, "MF8") : 1
);
int c = !add(
!div(TwoTimesLMUL, DLEN),
TwoTimesLMUL,
!mul(5, !add(4, !logtwo(!div(DLEN, sew))))
);
}

/// Cycles for ordered reductions take approximatley 5*VL cycles
/// Cycles for ordered reductions take approximatley 6*VL cycles
class SiFive7GetOrderedReductionCycles<string mx, int sew> {
defvar VLEN = 512;
// (VLEN * LMUL) / SEW
Expand All @@ -172,7 +172,7 @@ class SiFive7GetOrderedReductionCycles<string mx, int sew> {
!eq(mx, "MF4") : !div(!div(VLEN, 4), sew),
!eq(mx, "MF8") : !div(!div(VLEN, 8), sew),
);
int c = !mul(5, VLUpperBound);
int c = !mul(6, VLUpperBound);
}

class SiFive7AnyToGPRBypass<SchedRead read, int cycles = 2>
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