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[RISCV] Update the latency of floating point load in SiFive P500 scheduling model #133165

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Merged
mshockwave merged 1 commit into from
Mar 27, 2025
Merged

[RISCV] Update the latency of floating point load in SiFive P500 scheduling model #133165

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2 changes: 1 addition & 1 deletion llvm/lib/Target/RISCV/RISCVSchedSiFiveP500.td
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Original file line number Diff line number Diff line change
Expand Up @@ -132,7 +132,7 @@ def : WriteRes<WriteLDW, [SiFiveP500Load]>;
def : WriteRes<WriteLDD, [SiFiveP500Load]>;
}

let Latency = 6 in {
let Latency = 5 in {
def : WriteRes<WriteFLD16, [SiFiveP500Load]>;
def : WriteRes<WriteFLD32, [SiFiveP500Load]>;
def : WriteRes<WriteFLD64, [SiFiveP500Load]>;
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10 changes: 5 additions & 5 deletions llvm/test/tools/llvm-mca/RISCV/SiFiveP500/load.s
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Expand Up @@ -9,12 +9,12 @@ fld ft0, 0(a0)

# CHECK: Iterations: 1
# CHECK-NEXT: Instructions: 4
# CHECK-NEXT: Total Cycles: 12
# CHECK-NEXT: Total Cycles: 11
# CHECK-NEXT: Total uOps: 4

# CHECK: Dispatch Width: 3
# CHECK-NEXT: uOps Per Cycle: 0.33
# CHECK-NEXT: IPC: 0.33
# CHECK-NEXT: uOps Per Cycle: 0.36
# CHECK-NEXT: IPC: 0.36
# CHECK-NEXT: Block RThroughput: 4.0

# CHECK: Instruction Info:
Expand All @@ -28,8 +28,8 @@ fld ft0, 0(a0)
# CHECK: [1] [2] [3] [4] [5] [6] Instructions:
# CHECK-NEXT: 1 4 1.00 * lw t0, 0(a0)
# CHECK-NEXT: 1 4 1.00 * ld t0, 0(a0)
# CHECK-NEXT: 1 6 1.00 * flw ft0, 0(a0)
# CHECK-NEXT: 1 6 1.00 * fld ft0, 0(a0)
# CHECK-NEXT: 1 5 1.00 * flw ft0, 0(a0)
# CHECK-NEXT: 1 5 1.00 * fld ft0, 0(a0)

# CHECK: Resources:
# CHECK-NEXT: [0] - SiFiveP500Div
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