librustc: Attempt to put out burning tree by fixing translation of unary negation in boolean constants. rs=burningtree

Author: pcwalton

src/librustc/lib/llvm.rs

@@ -445,14 +445,19 @@ pub extern mod llvm {
                                            Count: c_uint,
                                            Packed: Bool) -> ValueRef;
 
-    pub unsafe fn LLVMConstString(Str: *c_char, Length: c_uint,
-                       DontNullTerminate: Bool) -> ValueRef;
-    pub unsafe fn LLVMConstArray(ElementTy: TypeRef, ConstantVals: *ValueRef,
-                      Length: c_uint) -> ValueRef;
+    pub unsafe fn LLVMConstString(Str: *c_char,
+                                  Length: c_uint,
+                                  DontNullTerminate: Bool)
+                               -> ValueRef;
+    pub unsafe fn LLVMConstArray(ElementTy: TypeRef,
+                                 ConstantVals: *ValueRef,
+                                 Length: c_uint)
+                              -> ValueRef;
     pub unsafe fn LLVMConstStruct(ConstantVals: *ValueRef,
-                       Count: c_uint, Packed: Bool) -> ValueRef;
+                                  Count: c_uint,
+                                  Packed: Bool) -> ValueRef;
     pub unsafe fn LLVMConstVector(ScalarConstantVals: *ValueRef,
-                       Size: c_uint) -> ValueRef;
+                                  Size: c_uint) -> ValueRef;
 
     /* Constant expressions */
     pub unsafe fn LLVMAlignOf(Ty: TypeRef) -> ValueRef;
@@ -463,8 +468,8 @@ pub extern mod llvm {
     pub unsafe fn LLVMConstFNeg(ConstantVal: ValueRef) -> ValueRef;
     pub unsafe fn LLVMConstNot(ConstantVal: ValueRef) -> ValueRef;
     pub unsafe fn LLVMConstAdd(LHSConstant: ValueRef,
-                           RHSConstant: ValueRef)
-                        -> ValueRef;
+                               RHSConstant: ValueRef)
+                            -> ValueRef;
     pub unsafe fn LLVMConstNSWAdd(LHSConstant: ValueRef,
                               RHSConstant: ValueRef)
                            -> ValueRef;
@@ -475,14 +480,14 @@ pub extern mod llvm {
                             RHSConstant: ValueRef)
                          -> ValueRef;
     pub unsafe fn LLVMConstSub(LHSConstant: ValueRef,
-                           RHSConstant: ValueRef)
-                        -> ValueRef;
+                               RHSConstant: ValueRef)
+                            -> ValueRef;
     pub unsafe fn LLVMConstNSWSub(LHSConstant: ValueRef,
-                              RHSConstant: ValueRef)
-                           -> ValueRef;
+                                  RHSConstant: ValueRef)
+                               -> ValueRef;
     pub unsafe fn LLVMConstNUWSub(LHSConstant: ValueRef,
-                              RHSConstant: ValueRef)
-                           -> ValueRef;
+                                  RHSConstant: ValueRef)
+                               -> ValueRef;
     pub unsafe fn LLVMConstFSub(LHSConstant: ValueRef,
                                 RHSConstant: ValueRef)
                              -> ValueRef;

src/librustc/middle/trans/consts.rs

@@ -204,7 +204,18 @@ pub fn const_expr(cx: @crate_ctxt, e: @ast::expr) -> ValueRef {
               ast::box(_)  |
               ast::uniq(_) |
               ast::deref  => const_deref(cx, te),
-              ast::not    => llvm::LLVMConstNot(te),
+              ast::not    => {
+                match ty::get(ty).sty {
+                    ty::ty_bool => {
+                        // Somewhat questionable, but I believe this is
+                        // correct.
+                        let te = llvm::LLVMConstTrunc(te, T_i1());
+                        let te = llvm::LLVMConstNot(te);
+                        llvm::LLVMConstZExt(te, T_bool())
+                    }
+                    _ => llvm::LLVMConstNot(te),
+                }
+              }
               ast::neg    => {
                 if is_float { llvm::LLVMConstFNeg(te) }
                 else        { llvm::LLVMConstNeg(te) }