From 2e1bdd0d14f490a80bbed3ee0e0479a908715d33 Mon Sep 17 00:00:00 2001
From: Vexu <git@vexu.eu>
Date: Thu, 9 Jul 2020 21:25:55 +0300
Subject: [PATCH] use correct cast function when doing `@floatCast` at comptime

Closes #5832
---
 src/ir.cpp                    |  2 +-
 test/stage1/behavior/cast.zig | 13 +++++++++++++
 2 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/src/ir.cpp b/src/ir.cpp
index a45455ad39..81b7f14f84 100644
--- a/src/ir.cpp
+++ b/src/ir.cpp
@@ -26718,7 +26718,7 @@ static IrInstGen *ir_analyze_instruction_float_cast(IrAnalyze *ira, IrInstSrcFlo
     }
 
     if (instr_is_comptime(target) || dest_type->id == ZigTypeIdComptimeFloat) {
-        return ir_implicit_cast2(ira, &instruction->target->base, target, dest_type);
+        return ir_analyze_widen_or_shorten(ira, &instruction->target->base, target, dest_type);
     }
 
     if (target->value->type->id != ZigTypeIdFloat) {
diff --git a/test/stage1/behavior/cast.zig b/test/stage1/behavior/cast.zig
index 77cdacc307..4325b0b9e4 100644
--- a/test/stage1/behavior/cast.zig
+++ b/test/stage1/behavior/cast.zig
@@ -384,6 +384,19 @@ test "@intCast i32 to u7" {
     expect(z == 0xff);
 }
 
+test "@floatCast cast down" {
+    {
+        var double: f64 = 0.001534;
+        var single = @floatCast(f32, double);
+        expect(@TypeOf(single) == f32);
+    }
+    {
+        const double: f64 = 0.001534;
+        const single = @floatCast(f32, double);
+        expect(@TypeOf(single) == f32);
+    }
+}
+
 test "implicit cast undefined to optional" {
     expect(MakeType(void).getNull() == null);
     expect(MakeType(void).getNonNull() != null);