From 704c6f353f68745168902c6c66c04bb730bd30e6 Mon Sep 17 00:00:00 2001
From: ReinUsesLisp <reinuseslisp@airmail.cc>
Date: Sun, 21 Feb 2021 17:50:14 -0300
Subject: shader: Rename, implement FADD.SAT and P2R (imm)

---
 .../backend/spirv/emit_spirv_integer.cpp           | 75 +++++++++++++++-------
 1 file changed, 52 insertions(+), 23 deletions(-)

(limited to 'src/shader_recompiler/backend/spirv/emit_spirv_integer.cpp')

diff --git a/src/shader_recompiler/backend/spirv/emit_spirv_integer.cpp b/src/shader_recompiler/backend/spirv/emit_spirv_integer.cpp
index 22117a4ee..4c0b5990d 100644
--- a/src/shader_recompiler/backend/spirv/emit_spirv_integer.cpp
+++ b/src/shader_recompiler/backend/spirv/emit_spirv_integer.cpp
@@ -7,10 +7,39 @@
 namespace Shader::Backend::SPIRV {
 
 Id EmitIAdd32(EmitContext& ctx, IR::Inst* inst, Id a, Id b) {
-    if (inst->HasAssociatedPseudoOperation()) {
-        throw NotImplementedException("Pseudo-operations on IAdd32");
+    Id result{};
+    if (IR::Inst* const carry{inst->GetAssociatedPseudoOperation(IR::Opcode::GetCarryFromOp)}) {
+        const Id carry_type{ctx.TypeStruct(ctx.U32[1], ctx.U32[1])};
+        const Id carry_result{ctx.OpIAddCarry(carry_type, a, b)};
+        result = ctx.OpCompositeExtract(ctx.U32[1], carry_result, 0U);
+
+        const Id carry_value{ctx.OpCompositeExtract(ctx.U32[1], carry_result, 1U)};
+        carry->SetDefinition(ctx.OpINotEqual(ctx.U1, carry_value, ctx.u32_zero_value));
+        carry->Invalidate();
+    } else {
+        result = ctx.OpIAdd(ctx.U32[1], a, b);
     }
-    return ctx.OpIAdd(ctx.U32[1], a, b);
+    if (IR::Inst* const zero{inst->GetAssociatedPseudoOperation(IR::Opcode::GetZeroFromOp)}) {
+        zero->SetDefinition(ctx.OpIEqual(ctx.U1, result, ctx.u32_zero_value));
+        zero->Invalidate();
+    }
+    if (IR::Inst* const sign{inst->GetAssociatedPseudoOperation(IR::Opcode::GetSignFromOp)}) {
+        sign->SetDefinition(ctx.OpSLessThan(ctx.U1, result, ctx.u32_zero_value));
+        sign->Invalidate();
+    }
+    if (IR::Inst * overflow{inst->GetAssociatedPseudoOperation(IR::Opcode::GetOverflowFromOp)}) {
+        // https://stackoverflow.com/questions/55468823/how-to-detect-integer-overflow-in-c
+        constexpr u32 s32_max{static_cast<u32>(std::numeric_limits<s32>::max())};
+        const Id is_positive{ctx.OpSGreaterThanEqual(ctx.U1, a, ctx.u32_zero_value)};
+        const Id sub_a{ctx.OpISub(ctx.U32[1], ctx.Constant(ctx.U32[1], s32_max), a)};
+
+        const Id positive_test{ctx.OpSGreaterThan(ctx.U1, b, sub_a)};
+        const Id negative_test{ctx.OpSLessThan(ctx.U1, b, sub_a)};
+        const Id carry_flag{ctx.OpSelect(ctx.U1, is_positive, positive_test, negative_test)};
+        overflow->SetDefinition(carry_flag);
+        overflow->Invalidate();
+    }
+    return result;
 }
 
 void EmitIAdd64(EmitContext&) {
@@ -49,16 +78,16 @@ void EmitShiftRightArithmetic32(EmitContext&) {
     throw NotImplementedException("SPIR-V Instruction");
 }
 
-void EmitBitwiseAnd32(EmitContext&) {
-    throw NotImplementedException("SPIR-V Instruction");
+Id EmitBitwiseAnd32(EmitContext& ctx, Id a, Id b) {
+    return ctx.OpBitwiseAnd(ctx.U32[1], a, b);
 }
 
-void EmitBitwiseOr32(EmitContext&) {
-    throw NotImplementedException("SPIR-V Instruction");
+Id EmitBitwiseOr32(EmitContext& ctx, Id a, Id b) {
+    return ctx.OpBitwiseOr(ctx.U32[1], a, b);
 }
 
-void EmitBitwiseXor32(EmitContext&) {
-    throw NotImplementedException("SPIR-V Instruction");
+Id EmitBitwiseXor32(EmitContext& ctx, Id a, Id b) {
+    return ctx.OpBitwiseXor(ctx.U32[1], a, b);
 }
 
 void EmitBitFieldInsert(EmitContext&) {
@@ -77,36 +106,36 @@ Id EmitSLessThan(EmitContext& ctx, Id lhs, Id rhs) {
     return ctx.OpSLessThan(ctx.U1, lhs, rhs);
 }
 
-void EmitULessThan(EmitContext&) {
-    throw NotImplementedException("SPIR-V Instruction");
+Id EmitULessThan(EmitContext& ctx, Id lhs, Id rhs) {
+    return ctx.OpULessThan(ctx.U1, lhs, rhs);
 }
 
-void EmitIEqual(EmitContext&) {
-    throw NotImplementedException("SPIR-V Instruction");
+Id EmitIEqual(EmitContext& ctx, Id lhs, Id rhs) {
+    return ctx.OpIEqual(ctx.U1, lhs, rhs);
 }
 
-void EmitSLessThanEqual(EmitContext&) {
-    throw NotImplementedException("SPIR-V Instruction");
+Id EmitSLessThanEqual(EmitContext& ctx, Id lhs, Id rhs) {
+    return ctx.OpSLessThanEqual(ctx.U1, lhs, rhs);
 }
 
-void EmitULessThanEqual(EmitContext&) {
-    throw NotImplementedException("SPIR-V Instruction");
+Id EmitULessThanEqual(EmitContext& ctx, Id lhs, Id rhs) {
+    return ctx.OpULessThanEqual(ctx.U1, lhs, rhs);
 }
 
 Id EmitSGreaterThan(EmitContext& ctx, Id lhs, Id rhs) {
     return ctx.OpSGreaterThan(ctx.U1, lhs, rhs);
 }
 
-void EmitUGreaterThan(EmitContext&) {
-    throw NotImplementedException("SPIR-V Instruction");
+Id EmitUGreaterThan(EmitContext& ctx, Id lhs, Id rhs) {
+    return ctx.OpUGreaterThan(ctx.U1, lhs, rhs);
 }
 
-void EmitINotEqual(EmitContext&) {
-    throw NotImplementedException("SPIR-V Instruction");
+Id EmitINotEqual(EmitContext& ctx, Id lhs, Id rhs) {
+    return ctx.OpINotEqual(ctx.U1, lhs, rhs);
 }
 
-void EmitSGreaterThanEqual(EmitContext&) {
-    throw NotImplementedException("SPIR-V Instruction");
+Id EmitSGreaterThanEqual(EmitContext& ctx, Id lhs, Id rhs) {
+    return ctx.OpSGreaterThanEqual(ctx.U1, lhs, rhs);
 }
 
 Id EmitUGreaterThanEqual(EmitContext& ctx, Id lhs, Id rhs) {
-- 
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