From 4502595bc2518eecf934110e9393b11bf0c2f75a Mon Sep 17 00:00:00 2001
From: ReinUsesLisp <reinuseslisp@airmail.cc>
Date: Sun, 9 May 2021 18:03:01 -0300
Subject: glasm: Initial GLASM fp64 support

---
 src/shader_recompiler/backend/glasm/reg_alloc.cpp | 66 ++++++++++++++++-------
 1 file changed, 47 insertions(+), 19 deletions(-)

(limited to 'src/shader_recompiler/backend/glasm/reg_alloc.cpp')

diff --git a/src/shader_recompiler/backend/glasm/reg_alloc.cpp b/src/shader_recompiler/backend/glasm/reg_alloc.cpp
index 030b48d83..82b627500 100644
--- a/src/shader_recompiler/backend/glasm/reg_alloc.cpp
+++ b/src/shader_recompiler/backend/glasm/reg_alloc.cpp
@@ -14,12 +14,11 @@
 namespace Shader::Backend::GLASM {
 
 Register RegAlloc::Define(IR::Inst& inst) {
-    const Id id{Alloc()};
-    inst.SetDefinition<Id>(id);
-    Register ret;
-    ret.type = Type::Register;
-    ret.id = id;
-    return ret;
+    return Define(inst, false);
+}
+
+Register RegAlloc::LongDefine(IR::Inst& inst) {
+    return Define(inst, true);
 }
 
 Value RegAlloc::Consume(const IR::Value& value) {
@@ -40,6 +39,10 @@ Value RegAlloc::Consume(const IR::Value& value) {
         ret.type = Type::F32;
         ret.imm_f32 = value.F32();
         break;
+    case IR::Type::F64:
+        ret.type = Type::F64;
+        ret.imm_f64 = value.F64();
+        break;
     default:
         throw NotImplementedException("Immediate type {}", value.Type());
     }
@@ -49,7 +52,14 @@ Value RegAlloc::Consume(const IR::Value& value) {
 Register RegAlloc::AllocReg() {
     Register ret;
     ret.type = Type::Register;
-    ret.id = Alloc();
+    ret.id = Alloc(false);
+    return ret;
+}
+
+Register RegAlloc::AllocLongReg() {
+    Register ret;
+    ret.type = Type::Register;
+    ret.id = Alloc(true);
     return ret;
 }
 
@@ -57,6 +67,15 @@ void RegAlloc::FreeReg(Register reg) {
     Free(reg.id);
 }
 
+Register RegAlloc::Define(IR::Inst& inst, bool is_long) {
+    const Id id{Alloc(is_long)};
+    inst.SetDefinition<Id>(id);
+    Register ret;
+    ret.type = Type::Register;
+    ret.id = id;
+    return ret;
+}
+
 Value RegAlloc::Consume(IR::Inst& inst) {
     const Id id{inst.Definition<Id>()};
     inst.DestructiveRemoveUsage();
@@ -69,18 +88,23 @@ Value RegAlloc::Consume(IR::Inst& inst) {
     return ret;
 }
 
-Id RegAlloc::Alloc() {
-    for (size_t reg = 0; reg < NUM_REGS; ++reg) {
-        if (register_use[reg]) {
-            continue;
+Id RegAlloc::Alloc(bool is_long) {
+    size_t& num_regs{is_long ? num_used_long_registers : num_used_registers};
+    std::bitset<NUM_REGS>& use{is_long ? long_register_use : register_use};
+    if (num_used_registers + num_used_long_registers < NUM_REGS) {
+        for (size_t reg = 0; reg < NUM_REGS; ++reg) {
+            if (use[reg]) {
+                continue;
+            }
+            num_regs = std::max(num_regs, reg + 1);
+            use[reg] = true;
+            Id ret{};
+            ret.index.Assign(static_cast<u32>(reg));
+            ret.is_long.Assign(is_long ? 1 : 0);
+            ret.is_spill.Assign(0);
+            ret.is_condition_code.Assign(0);
+            return ret;
         }
-        num_used_registers = std::max(num_used_registers, reg + 1);
-        register_use[reg] = true;
-        Id ret{};
-        ret.index.Assign(static_cast<u32>(reg));
-        ret.is_spill.Assign(0);
-        ret.is_condition_code.Assign(0);
-        return ret;
     }
     throw NotImplementedException("Register spilling");
 }
@@ -89,7 +113,11 @@ void RegAlloc::Free(Id id) {
     if (id.is_spill != 0) {
         throw NotImplementedException("Free spill");
     }
-    register_use[id.index] = false;
+    if (id.is_long != 0) {
+        long_register_use[id.index] = false;
+    } else {
+        register_use[id.index] = false;
+    }
 }
 
 } // namespace Shader::Backend::GLASM
-- 
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