From e010b1396bebc7e3ccace4247114f92f544082d6 Mon Sep 17 00:00:00 2001
From: seyko <seyko2@gmail.com>
Date: Sat, 16 Apr 2016 12:41:53 +0300
Subject: [PATCH] __builtin_expect no-op

    Taken from David Mertens tcc branch on github
    https://github.com/run4flat/tinycc.git
---
 tccgen.c | 37 +++++++++++++++++++++++++++++++++++++
 tcctok.h |  1 +
 2 files changed, 38 insertions(+)

diff --git a/tccgen.c b/tccgen.c
index 4b2893a..8bf7007 100644
--- a/tccgen.c
+++ b/tccgen.c
@@ -84,6 +84,7 @@ static void block(int *bsym, int *csym, int *case_sym, int *def_sym, int case_re
 static void decl_initializer_alloc(CType *type, AttributeDef *ad, int r, int has_init, int v, int scope);
 static int decl0(int l, int is_for_loop_init);
 static void expr_eq(void);
+static void expr_lor_const(void);
 static void unary_type(CType *type);
 static void vla_runtime_type_size(CType *type, int *a);
 static void vla_sp_restore(void);
@@ -3938,6 +3939,22 @@ ST_FUNC void unary(void)
         vtop->type.t |= VT_UNSIGNED;
         break;
 
+    case TOK_builtin_expect:
+        {
+            /* __builtin_expect is a no-op for now */
+            int saved_nocode_wanted;
+            next();
+            skip('(');
+            expr_eq();
+            skip(',');
+            saved_nocode_wanted = nocode_wanted;
+            nocode_wanted = 1;
+            expr_lor_const();
+            vpop();
+            nocode_wanted = saved_nocode_wanted;
+            skip(')');
+        }
+        break;
     case TOK_builtin_types_compatible_p:
         {
             CType type1, type2;
@@ -4466,6 +4483,26 @@ static void expr_or(void)
     }
 }
 
+/* XXX: fix this mess */
+static void expr_land_const(void)
+{
+    expr_or();
+    while (tok == TOK_LAND) {
+        next();
+        expr_or();
+        gen_op(TOK_LAND);
+    }
+}
+static void expr_lor_const(void)
+{
+    expr_land_const();
+    while (tok == TOK_LOR) {
+        next();
+        expr_land_const();
+        gen_op(TOK_LOR);
+    }
+}
+
 static void expr_land(void)
 {
     expr_or();
diff --git a/tcctok.h b/tcctok.h
index b2fbebf..2cb310b 100644
--- a/tcctok.h
+++ b/tcctok.h
@@ -131,6 +131,7 @@
      DEF(TOK_builtin_constant_p, "__builtin_constant_p")
      DEF(TOK_builtin_frame_address, "__builtin_frame_address")
      DEF(TOK_builtin_return_address, "__builtin_return_address")
+     DEF(TOK_builtin_expect, "__builtin_expect")
 #ifdef TCC_TARGET_X86_64
 #ifdef TCC_TARGET_PE
      DEF(TOK_builtin_va_start, "__builtin_va_start")