validate-binaries

Testing & Quality

Validate voxtype binaries for CPU instruction contamination. Use when checking release binaries for AVX-512 or GFNI instruction leaks that would crash on older CPUs.

QUICK START

How to use this skill

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Source SKILL.md: https://github.com/peteonrails/voxtype/blob/HEAD/.claude/skills/validate-binaries/SKILL.md

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Validate Binaries

Verify that voxtype binaries don't contain forbidden CPU instructions that would cause crashes on older CPUs.

What This Checks

Binary	Must NOT have	Must have
AVX2	zmm registers, AVX-512 EVEX, GFNI	-
Vulkan	zmm registers, AVX-512 EVEX, GFNI	-
AVX-512	-	zmm registers (confirms optimization)

Forbidden Instructions

zmm registers - 512-bit AVX-512 registers
vpternlog, vpermt2, vpblendm - AVX-512 specific
{1to4}, {1to8}, {1to16} - AVX-512 broadcast syntax
vgf2p8, gf2p8 - GFNI instructions (not on Zen 3)

Usage

When asked to validate binaries:

Determine the version from context or ask
Find binaries in releases/${VERSION}/
Run objdump checks on each binary
Report pass/fail for each

Validation Commands

# Set version
VERSION=0.4.14

# Check AVX2 binary (should be 0 for all)
echo "=== AVX2 Binary ==="
objdump -d releases/${VERSION}/voxtype-${VERSION}-linux-x86_64-avx2 | grep -c zmm || echo "zmm: 0"
objdump -d releases/${VERSION}/voxtype-${VERSION}-linux-x86_64-avx2 | grep -cE 'vpternlog|vpermt2|vpblendm' || echo "AVX-512 ops: 0"
objdump -d releases/${VERSION}/voxtype-${VERSION}-linux-x86_64-avx2 | grep -cE 'vgf2p8|gf2p8' || echo "GFNI: 0"

# Check Vulkan binary (should be 0 for all)
echo "=== Vulkan Binary ==="
objdump -d releases/${VERSION}/voxtype-${VERSION}-linux-x86_64-vulkan | grep -c zmm || echo "zmm: 0"
objdump -d releases/${VERSION}/voxtype-${VERSION}-linux-x86_64-vulkan | grep -cE 'vgf2p8|gf2p8' || echo "GFNI: 0"

# Check AVX-512 binary (should be > 0)
echo "=== AVX-512 Binary ==="
objdump -d releases/${VERSION}/voxtype-${VERSION}-linux-x86_64-avx512 | grep -c zmm

Interpreting Results

PASS conditions:

AVX2: All counts are 0
Vulkan: All counts are 0
AVX-512: zmm count > 0

FAIL conditions:

AVX2 or Vulkan has any zmm/GFNI instructions
AVX-512 has 0 zmm instructions (not optimized)

If validation fails, the Docker build cache is likely stale. Recommend:

docker compose -f docker-compose.build.yml build --no-cache avx2 vulkan