PERF: remove redundant checks in HINCRBYFLOAT & INCREX commands

[Baraa-Hasheesh]

First Enhancement

Currently HINCRBYFLOAT uses the standard getLongDoubleFromObjectOrReply utility function to parse input values

This function internally eventually either:

• calls string2ld which returns an error in case NaN is encountered
• does a casting chain of (long double)(long) which will never produce a NaN

Using these facts we can remove any existing isnan check that is done on the results obtained from this function call, this allows us to remove the isnan(incr) check in hincrbyfloatCommand

Second Enhancement

After which given that we check isinf(incr) in hincrbyfloatCommand, the result of value += incr will never be NaN

• incr is not NaN or ±INF
• value is not NaN

Hence we can remove the isnan(value) value check

Third Enhancement

The value_ld = oldvalue_ld + incr_ld; will never evaluate to NaN

Both components are parsed using getLongDoubleFromObjectOrReply & are checked for ±INF, so a NaN result is not possible

So we can remove the followup NaN check

Performance Enhancments

The following are the results of my local benchmarks of these changes

group = 1, scenario = HINCRBYFLOAT, test_id = 2_HINCRBYFLOAT

	% Change	Test	HEAD	HEAD	HEAD stats	HEAD stats
✅	+2.7±0.4%	HINCRBYFLOAT hash:rand_int f 1.1 rps P10 T4	552K	566.3K	n=4, σ=1.07K, CV=0.2%, CI95%=±0.3%, PI95%=±0.7%	n=4, σ=736, CV=0.1%, CI95%=±0.2%, PI95%=±0.5%
✅	-2.6±0.4%	HINCRBYFLOAT hash:rand_int f 1.1 avg_latency P10 T4	2.315	2.254	n=4, σ=0.00450, CV=0.2%, CI95%=±0.3%, PI95%=±0.7%	n=4, σ=0.00263, CV=0.1%, CI95%=±0.2%, PI95%=±0.4%
✅	-2.9±0.6%	HINCRBYFLOAT hash:rand_int f 1.1 p50_latency P10 T4	2.317	2.249	n=4, σ=0.00766, CV=0.3%, CI95%=±0.5%, PI95%=±1.2%	n=4, σ=0.00400, CV=0.2%, CI95%=±0.3%, PI95%=±0.6%
➖	-2.5%	HINCRBYFLOAT hash:rand_int f 1.1 p95_latency P10 T4	2.493	2.43	n=4, σ=0.00400, CV=0.2%, CI95%=±0.3%, PI95%=±0.6%	n=4, σ=0, CV=0.0%
✅	-2.8±0.5%	HINCRBYFLOAT hash:rand_int f 1.1 p99_latency P10 T4	2.541	2.469	n=4, σ=0.00766, CV=0.3%, CI95%=±0.5%, PI95%=±1.1%	n=4, σ=0.00400, CV=0.2%, CI95%=±0.3%, PI95%=±0.6%

group = 2, scenario = INCREX_BYFLOAT, test_id = 3_INCREX_BYFLOAT

	% Change	Test	HEAD	HEAD	HEAD stats	HEAD stats
✅	+0.7±0.1%	INCREX str:rand_int BYFLOAT 1.1 rps P10 T4	371.7K	374.4K	n=4, σ=266, CV=0.1%, CI95%=±0.1%, PI95%=±0.3%	n=4, σ=126, CV=0.0%, CI95%=±0.1%, PI95%=±0.1%
✅	-0.7±0.1%	INCREX str:rand_int BYFLOAT 1.1 avg_latency P10 T4	3.436	3.411	n=4, σ=0.00216, CV=0.1%, CI95%=±0.1%, PI95%=±0.2%	n=4, σ=0.00126, CV=0.0%, CI95%=±0.1%, PI95%=±0.1%
✅	-0.6±0.3%	INCREX str:rand_int BYFLOAT 1.1 p50_latency P10 T4	3.465	3.445	n=4, σ=0.00400, CV=0.1%, CI95%=±0.2%, PI95%=±0.4%	n=4, σ=0.00400, CV=0.1%, CI95%=±0.2%, PI95%=±0.4%
✅	-0.8±0.2%	INCREX str:rand_int BYFLOAT 1.1 p95_latency P10 T4	3.613	3.585	n=4, σ=0.00400, CV=0.1%, CI95%=±0.2%, PI95%=±0.4%	n=4, σ=0.00400, CV=0.1%, CI95%=±0.2%, PI95%=±0.4%
✅	-1.0±0.3%	INCREX str:rand_int BYFLOAT 1.1 p99_latency P10 T4	3.671	3.635	n=4, σ=0.00653, CV=0.2%, CI95%=±0.3%, PI95%=±0.6%	n=4, σ=0.00462, CV=0.1%, CI95%=±0.2%, PI95%=±0.5%

Configuration:

• architecture: aarch64
• benchmark_mode: duration
• clients: 128
• cluster_mode: False
• data_size: 100
• duration: 120
• env_aslr: full
• env_benchmark_tool_version: valkey-benchmark 255.255.255 (git:ae2ab6bb)
• env_client_cpu_range: 6-15
• env_cpu_governor: not_available
• env_cpu_model:
• env_idle_states: not_available
• env_kernel_version: 6.12.103-127.188.amzn2023.aarch64
• env_numa_nodes: 1
• env_os: Amazon Linux 2023.12.20260909
• env_server_cpu_range: 1-5
• env_thp: madvise
• env_turbo_boost: not_available
• status: success
• test_phase: test
• tls: False
• valkey_benchmark_threads: 8
• warmup: 10

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📒 Files selected for processing (3)

• src/t_hash.c
• tests/unit/type/hash.tcl
• tests/unit/type/incr.tcl

🚧 Files skipped from review as they are similar to previous changes (2)

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• src/t_hash.c

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📝 Walkthrough

Walkthrough

The change updates NaN and Infinity handling in HINCRBYFLOAT and INCRBYFLOAT. It removes selected NaN checks, retains Infinity checks, updates hash error text, and adds regression tests.

Changes

Floating-point increment validation

Layer / File(s)	Summary
Hash increment validation src/t_hash.c, tests/unit/type/hash.tcl	HINCRBYFLOAT retains Infinity checks, changes the related error text, and updates tests for NaN increments and infinite field values.
String increment validation src/t_string.c, tests/unit/type/incr.tcl	INCRBYFLOAT no longer rejects NaN results at the removed guard. Tests cover NaN input and Infinity arithmetic without changing the stored value.

Priority: ⬇️ Low

Estimated code review effort: 2 (Simple) | ~10 minutes

Suggested reviewers: madolson

Merge Risk: ⚪ Minimal · up to 5f375

The floating-point validation changes have matching regression coverage and no concrete merge-blocking behavior remains.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 1 functions across 1 files. (2 skipped: 2 …	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly identifies the main change: removing redundant checks in HINCRBYFLOAT and INCREX commands.
Description check	✅ Passed	The description directly explains the removed NaN checks and reports related benchmark results for HINCRBYFLOAT and INCREX.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

Full details: Docstring Coverage

Explanation

Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 1 functions across 1 files. (2 skipped: 2 unsupported.)

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[valkey-review-bot]

The redundant checks can be removed without changing HINCRBYFLOAT's existing error replies; the current string changes also leave an existing test failing.

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Actionable comments posted: 1

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Inline comments:
In `@src/t_hash.c`:
- Line 1284: Update the HINCRBYFLOAT +inf assertion in the hash test to expect
“value is Infinity” instead of the obsolete “value is NaN or Infinity” text,
matching the error emitted by addReplyError.

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📥 Commits

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📒 Files selected for processing (4)

• src/t_hash.c
• src/t_string.c
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• src/t_string.c

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.51%. Comparing base (ae2ab6b) to head (5f375d1).
⚠️ Report is 6 commits behind head on unstable.

Additional details and impacted files

@@             Coverage Diff              @@
##           unstable    #4690      +/-   ##
============================================
+ Coverage     80.42%   80.51%   +0.09%     
============================================
  Files           191      191              
  Lines         98805   100027    +1222     
============================================
+ Hits          79462    80539    +1077     
- Misses        19343    19488     +145     

Files with missing lines	Coverage Δ
src/t_hash.c	92.64% <100.00%> (+1.21%)	⬆️
src/t_string.c	97.01% <ø> (-0.18%)	⬇️

... and 29 files with indirect coverage changes

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