tree eb195360b0a22d51eab33d98e54cb1fb2a443b54
parent 4cdeb7d292bf28d2be22eb2e3870d0389dc6c860
author Paul Kirth <paulkirth@google.com> 1762300560 -0800
committer GitHub <noreply@github.com> 1762300560 +0000
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[llvm][mustache] Optimize accessor splitting with a single pass (#159198)

The splitMustacheString function previously used a loop of
StringRef::split and StringRef::trim. This was inefficient as
it scanned each segment of the accessor string multiple times.

This change introduces a custom splitAndTrim function that
performs both operations in a single pass over the string,
reducing redundant work and improving performance, most notably
in the number of CPU cycles executed.

| Metric | Baseline | Optimized | Change |
| --- | --- | --- | --- |
| Time (ms) | 35\.57 | 35\.36 | \-0.59% |
| Cycles | 34\.91M | 34\.26M | \-1.86% |
| Instructions | 85\.54M | 85\.24M | \-0.35% |
| Branch Misses | 111\.9K | 112\.2K | \+0.27% |
| Cache Misses | 242\.1K | 239\.9K | \-0.91% |