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recompiler: [widescreen.cull] bltz_sites (explicit left-edge funnel widen)

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Left-edge counterpart to slti_sites: emit psx_ws_cull_bltz at configured
bltz PCs. detect_cull_bltz_sites only classifies left-edge bltz for
auto_screen_x-qualified functions, so an X-only funnel wired via explicit
slti_sites had no left-edge widen. bltz_sites closes that gap. Identity at
4:3; regen-class.
This commit is contained in:
Claudio Varandas
2026-07-22 20:07:21 +01:00
parent ed5b1838b8
commit 64ca4c3dba
5 changed files with 28 additions and 4 deletions
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recompiler/src/code_generator.cpp
+9 -4
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@@ -721,10 +721,15 @@ std::string CodeGenerator::generate_branch_condition(uint32_t instr, uint32_t ad
if (opcode == 0x01) {
uint32_t regimm_op = (instr >> 16) & 0x1F;
if ((regimm_op & 0x01u) == 0x00u) { // bltz family (incl. bltzal + undefined mirrors)
// Classified LEFT-edge funnel bltz (auto_screen_x, signed idioms):
// reject only past the revealed margin. Identity at 4:3 (margin 0).
if (regimm_op == 0x00 && ws_cull_bltz_pcs_.count(addr))
return fmt::format("psx_ws_cull_bltz({}) /* ws auto screen-x cull (left edge) */",
// LEFT-edge funnel bltz: reject only past the revealed margin.
// Identity at 4:3 (margin 0). Two sources: (a) auto_screen_x's
// detect_cull_bltz_sites classification (ws_cull_bltz_pcs_), and
// (b) explicit [widescreen.cull] bltz_sites — the left-edge
// counterpart to slti_sites, for X-only funnels auto_screen_x can't
// qualify (whose bltz would otherwise never be widened).
if (regimm_op == 0x00 &&
(ws_cull_bltz_pcs_.count(addr) || config_.ws_cull_bltz_sites.count(addr)))
return fmt::format("psx_ws_cull_bltz({}) /* ws cull (left edge) */",
reg_name(rs));
return fmt::format("(int32_t){} < 0", reg_name(rs));
} else { // bgez family (incl. bgezal + undefined mirrors)