[PR #2489] [CLOSED] Fix V_FFBL_B32 #2775

New issue

Closed

opened 2026-02-27 22:01:12 +03:00 by kerem · 0 comments

kerem commented

2026-02-27 22:01:12 +03:00

Owner

📋 Pull Request Information

Original PR: https://github.com/shadps4-emu/shadPS4/pull/2489
Author: @DanielSvoboda
Created: 2/20/2025
Status: ❌ Closed

Base: main ← Head: patch-2

📝 Commits (1)

75b2438 Fix V_FFBL_B32

📊 Changes

1 file changed (+3 additions, -1 deletions)

View changed files

📝 src/shader_recompiler/frontend/translate/vector_alu.cpp (+3 -1)

📄 Description

Added check in V_FFBL_B32 to return 0xFFFFFFFF when S0 is zero, similar to V_FFBH_U32.
Otherwise, returns the position of the first low bit (bit 1) from LSB.

Instruction V_FFBL_B32
Description Find first bit low.
D.u = position of first 1 in S0 from LSB; D=0xFFFFFFFF if S0==0.

_{🔄 This issue represents a GitHub Pull Request. It cannot be merged through Gitea due to API limitations.}

## 📋 Pull Request Information **Original PR:** https://github.com/shadps4-emu/shadPS4/pull/2489 **Author:** [@DanielSvoboda](https://github.com/DanielSvoboda) **Created:** 2/20/2025 **Status:** ❌ Closed **Base:** `main` ← **Head:** `patch-2` --- ### 📝 Commits (1) - [`75b2438`](https://github.com/shadps4-emu/shadPS4/commit/75b24381674aa4a9e8859546360e5685827fff46) Fix V_FFBL_B32 ### 📊 Changes **1 file changed** (+3 additions, -1 deletions) <details> <summary>View changed files</summary> 📝 `src/shader_recompiler/frontend/translate/vector_alu.cpp` (+3 -1) </details> ### 📄 Description Added check in `V_FFBL_B32` to return `0xFFFFFFFF` when S0 is zero, similar to `V_FFBH_U32`. Otherwise, returns the position of the first low bit (bit 1) from LSB. Instruction V_FFBL_B32 Description Find first bit low. D.u = position of first 1 in S0 from LSB; D=0xFFFFFFFF if S0==0. --- <sub>🔄 This issue represents a GitHub Pull Request. It cannot be merged through Gitea due to API limitations.</sub>