stage2: slice and alignment fixes

 * Fix backend using wrong union field of the slice instruction.
 * LLVM backend properly sets alignment on global variables.
 * Sema: add coercion for *T to *[1]T
 * Sema: pointers to Decls with explicit alignment now have alignment
   metadata in them.

2 files changed, 6 insertions, 2 deletions

diff --git a/src/codegen/c.zig b/src/codegen/c.zig
index aa1ece7ba3..dd71590566 100644
--- a/src/codegen/c.zig
+++ b/src/codegen/c.zig
@@ -1663,7 +1663,8 @@ fn airMinMax(f: *Function, inst: Air.Inst.Index, operator: [*:0]const u8) !CValu
 fn airSlice(f: *Function, inst: Air.Inst.Index) !CValue {
     if (f.liveness.isUnused(inst)) return CValue.none;
 
-    const bin_op = f.air.instructions.items(.data)[inst].bin_op;
+    const ty_pl = f.air.instructions.items(.data)[inst].ty_pl;
+    const bin_op = f.air.extraData(Air.Bin, ty_pl.payload).data;
     const ptr = try f.resolveInst(bin_op.lhs);
     const len = try f.resolveInst(bin_op.rhs);
 
diff --git a/src/codegen/llvm.zig b/src/codegen/llvm.zig
index d6b41208f2..3f24bb535d 100644
--- a/src/codegen/llvm.zig
+++ b/src/codegen/llvm.zig
@@ -581,7 +581,9 @@ pub const DeclGen = struct {
         } else if (decl.val.castTag(.extern_fn)) |extern_fn| {
             _ = try self.resolveLlvmFunction(extern_fn.data);
         } else {
+            const target = self.module.getTarget();
             const global = try self.resolveGlobalDecl(decl);
+            global.setAlignment(decl.getAlignment(target));
             assert(decl.has_tv);
             const init_val = if (decl.val.castTag(.variable)) |payload| init_val: {
                 const variable = payload.data;
@@ -2713,7 +2715,8 @@ pub const FuncGen = struct {
     fn airSlice(self: *FuncGen, inst: Air.Inst.Index) !?*const llvm.Value {
         if (self.liveness.isUnused(inst)) return null;
 
-        const bin_op = self.air.instructions.items(.data)[inst].bin_op;
+        const ty_pl = self.air.instructions.items(.data)[inst].ty_pl;
+        const bin_op = self.air.extraData(Air.Bin, ty_pl.payload).data;
         const ptr = try self.resolveInst(bin_op.lhs);
         const len = try self.resolveInst(bin_op.rhs);
         const inst_ty = self.air.typeOfIndex(inst);