From 98009a2f66de32d1ea4df41cc03d5ad3d723b3ed Mon Sep 17 00:00:00 2001
From: Andrew Kelley <andrew@ziglang.org>
Date: Thu, 28 Oct 2021 17:41:45 -0700
Subject: C backend: implement trunc instruction

Note that there is not any test coverage yet for integer
truncation involving non-power-of-two integers.
---
 src/codegen/c.zig    | 12 +-----------
 src/codegen/llvm.zig |  3 +--
 2 files changed, 2 insertions(+), 13 deletions(-)

(limited to 'src/codegen')

diff --git a/src/codegen/c.zig b/src/codegen/c.zig
index ffc9bb0fe0..444adf0aa1 100644
--- a/src/codegen/c.zig
+++ b/src/codegen/c.zig
@@ -1089,7 +1089,6 @@ fn genBody(f: *Function, body: []const Air.Inst.Index) error{ AnalysisFail, OutO
             .call             => try airCall(f, inst),
             .dbg_stmt         => try airDbgStmt(f, inst),
             .intcast          => try airIntCast(f, inst),
-            .trunc            => try airTrunc(f, inst),
             .bool_to_int      => try airBoolToInt(f, inst),
             .load             => try airLoad(f, inst),
             .ret              => try airRet(f, inst),
@@ -1117,6 +1116,7 @@ fn genBody(f: *Function, body: []const Air.Inst.Index) error{ AnalysisFail, OutO
             .float_to_int,
             .fptrunc,
             .fpext,
+            .trunc,
             => try airSimpleCast(f, inst),
 
             .ptrtoint => try airPtrToInt(f, inst),
@@ -1366,16 +1366,6 @@ fn airIntCast(f: *Function, inst: Air.Inst.Index) !CValue {
     return local;
 }
 
-fn airTrunc(f: *Function, inst: Air.Inst.Index) !CValue {
-    if (f.liveness.isUnused(inst))
-        return CValue.none;
-
-    const ty_op = f.air.instructions.items(.data)[inst].ty_op;
-    const operand = try f.resolveInst(ty_op.operand);
-    _ = operand;
-    return f.fail("TODO: C backend: airTrunc", .{});
-}
-
 fn airBoolToInt(f: *Function, inst: Air.Inst.Index) !CValue {
     if (f.liveness.isUnused(inst))
         return CValue.none;
diff --git a/src/codegen/llvm.zig b/src/codegen/llvm.zig
index 9c2fd22df0..572e23ff28 100644
--- a/src/codegen/llvm.zig
+++ b/src/codegen/llvm.zig
@@ -3153,8 +3153,7 @@ pub const FuncGen = struct {
     }
 
     fn airTrunc(self: *FuncGen, inst: Air.Inst.Index) !?*const llvm.Value {
-        if (self.liveness.isUnused(inst))
-            return null;
+        if (self.liveness.isUnused(inst)) return null;
 
         const ty_op = self.air.instructions.items(.data)[inst].ty_op;
         const operand = try self.resolveInst(ty_op.operand);
-- 
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