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loop_unroll

A force-unrolled loop of `n` iterations. Stresses loop unrolling (unrollLoopsInModule) and the downstream SSA simplify on the unrolled body.

bucket: loop_unroll  ·  compile mode: target  ·  flags: -target spirv -emit-spirv-directly  ·  default N: 300

Phase composition across releases

Full sub-counter decomposition of compileInner — named leaf timers plus (self) residuals (a parent's time not covered by a named child, e.g. the autodiff transform in linkAndOptimizeIR (self)). Topmost band traces compileInner; hover a band for its phase.

Compiled Slang source

exact compiled source (N = 300); long files show the first 40 lines, the area around computeMain (±40), and the last 40 lines (gaps elided)

loop_unroll.slang

// AUTO-GENERATED by perf-suite/workloads.py — do not edit by hand.
RWStructuredBuffer<float> outBuf;

[shader("compute")]
[numthreads(1,1,1)]
void computeMain(uint3 tid : SV_DispatchThreadID)
{
    float acc = outBuf[tid.x];
    [ForceUnroll] for (int i = 0; i < 300; ++i)
        acc = acc * 1.0009 + sin(acc + float(i)) * 0.5 - cos(acc * 0.5);
    outBuf[0] = acc;
}