From 23947489f7075a688df0ca021229290dc17b5e6a Mon Sep 17 00:00:00 2001
From: Alexey Prokhin <alexey.prokhin@yandex.ru>
Date: Wed, 7 Dec 2011 15:25:42 +0400
Subject: [PATCH] Backported llvm3.0 intrinsic patch to ldc1

---
 dmd/attrib.c | 74 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 dmd/idgen.c  |  7 +++++
 2 files changed, 81 insertions(+)

diff --git a/dmd/attrib.c b/dmd/attrib.c
index 3bc9bae8..0e9b52fc 100644
--- a/dmd/attrib.c
+++ b/dmd/attrib.c
@@ -1174,6 +1174,63 @@ void PragmaDeclaration::semantic(Scope *sc)
         llvm_internal = LLVMva_arg;
     }
 
+    // pragma(fence) { templdecl(s) }
+    else if (ident == Id::fence)
+    {
+        if (args && args->dim > 0)
+        {
+             error("takes no parameters");
+             fatal();
+        }
+        llvm_internal = LLVMfence;
+    }
+
+    // pragma(atomic_load) { templdecl(s) }
+    else if (ident == Id::atomic_load)
+    {
+        if (args && args->dim > 0)
+        {
+             error("takes no parameters");
+             fatal();
+        }
+        llvm_internal = LLVMatomic_load;
+    }
+
+    // pragma(atomic_store) { templdecl(s) }
+    else if (ident == Id::atomic_store)
+    {
+        if (args && args->dim > 0)
+        {
+             error("takes no parameters");
+             fatal();
+        }
+        llvm_internal = LLVMatomic_store;
+    }
+
+    // pragma(atomic_cmp_xchg) { templdecl(s) }
+    else if (ident == Id::atomic_cmp_xchg)
+    {
+        if (args && args->dim > 0)
+        {
+             error("takes no parameters");
+             fatal();
+        }
+        llvm_internal = LLVMatomic_cmp_xchg;
+    }
+
+    // pragma(atomic_rmw, "string") { templdecl(s) }
+    else if (ident == Id::atomic_rmw)
+    {
+        Expression* expr = (Expression *)args->data[0];
+        expr = expr->semantic(sc);
+        if (!args || args->dim != 1 || !parseStringExp(expr, arg1str))
+        {
+             error("requires exactly 1 string literal parameter");
+             fatal();
+        }
+        llvm_internal = LLVMatomic_rmw;
+    }
+
     // pragma(ldc, "string") { templdecl(s) }
     else if (ident == Id::ldc)
     {
@@ -1286,8 +1343,24 @@ void PragmaDeclaration::semantic(Scope *sc)
             }
             break;
 
+        case LLVMatomic_rmw:
+            if (TemplateDeclaration* td = s->isTemplateDeclaration())
+            {
+                td->llvmInternal = llvm_internal;
+                td->intrinsicName = arg1str;
+            }
+            else
+            {
+                error("the '%s' pragma is only allowed on template declarations", ident->toChars());
+                fatal();
+            }
+            break;
+
         case LLVMva_start:
         case LLVMva_arg:
+        case LLVMatomic_load:
+        case LLVMatomic_store:
+        case LLVMatomic_cmp_xchg:
             if (TemplateDeclaration* td = s->isTemplateDeclaration())
             {
                 if (td->parameters->dim != 1)
@@ -1316,6 +1389,7 @@ void PragmaDeclaration::semantic(Scope *sc)
 
         case LLVMva_copy:
         case LLVMva_end:
+        case LLVMfence:
             if (FuncDeclaration* fd = s->isFuncDeclaration())
             {
                 fd->llvmInternal = llvm_internal;
diff --git a/dmd/idgen.c b/dmd/idgen.c
index 5ef958f0..88d12383 100644
--- a/dmd/idgen.c
+++ b/dmd/idgen.c
@@ -219,6 +219,7 @@ Msgtable msgtable[] =
     { "lib" },
     { "msg" },
 
+#if IN_LLVM
     // LDC pragma's
     { "intrinsic" },
     { "va_intrinsic" },
@@ -232,6 +233,12 @@ Msgtable msgtable[] =
     { "ldc" },
     { "allow_inline" },
     { "llvm_inline_asm" },
+    { "fence" },
+    { "atomic_load" },
+    { "atomic_store" },
+    { "atomic_cmp_xchg" },
+    { "atomic_rmw" },
+#endif
 
     // For special functions
     { "tohash", "toHash" },