From acea5cb6e0eb9379434e1db266f97415f3bc0616 Mon Sep 17 00:00:00 2001
From: Dennis Ranke <dennis.ranke@gmail.com>
Date: Sun, 2 Jan 2022 16:06:01 +0100
Subject: [PATCH] enable nontrapping fptoint feature in c and zig example

---
 examples/c/build.sh    | 2 +-
 examples/c/cart.c      | 6 +-----
 examples/zig/build.zig | 6 +++++-
 3 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/examples/c/build.sh b/examples/c/build.sh
index c23d192..93d1d22 100755
--- a/examples/c/build.sh
+++ b/examples/c/build.sh
@@ -1,6 +1,6 @@
 #!/bin/bash
 
-clang -O2 -Wno-incompatible-library-redeclaration --no-standard-libraries -ffast-math -Wl,--no-entry -Wl,--export-all -Wl,--import-memory -Wl,--initial-memory=262144 -Wl,-zstack-size=90000 -o cart.wasm cart.c --target=wasm32 && \
+clang -O2 -Wno-incompatible-library-redeclaration --no-standard-libraries -ffast-math -Xclang -target-feature -Xclang +nontrapping-fptoint -Wl,--no-entry -Wl,--export-all -Wl,--import-memory -Wl,--initial-memory=262144 -Wl,-zstack-size=90000 -o cart.wasm cart.c --target=wasm32 && \
 uw8 filter-exports cart.wasm cart.wasm && \
 wasm-opt -Oz --fast-math --strip-producers -o cart.wasm cart.wasm && \
 uw8 pack -l 9 cart.wasm cart.uw8
\ No newline at end of file
diff --git a/examples/c/cart.c b/examples/c/cart.c
index 1f065fe..3b652ae 100644
--- a/examples/c/cart.c
+++ b/examples/c/cart.c
@@ -3,10 +3,6 @@
 IMPORT("env", "atan2") extern float atan2(float, float);
 IMPORT("env", "time") extern float time();
 
-int ftoi(float v) {
-    return __builtin_wasm_trunc_s_i32_f32(v);
-}
-
 float sqrt(float v) {
     return __builtin_sqrt(v);
 }
@@ -22,7 +18,7 @@ void upd() {
         float y = (float)(i / 320 - 120);
         float d = 40000.0f / sqrt(x * x + y * y + 1.0f);
         float u = atan2(x, y) * 512.0f / 3.141f;
-        unsigned char c = (unsigned char)(ftoi(d + t * 2.0f) ^ ftoi(u + t)) >> 4;
+        unsigned char c = (unsigned char)((int)(d + t * 2.0f) ^ (int)(u + t)) >> 4;
         FRAMEBUFFER[i] = c;
 
         i += 1;
diff --git a/examples/zig/build.zig b/examples/zig/build.zig
index 8deb34c..5852a88 100644
--- a/examples/zig/build.zig
+++ b/examples/zig/build.zig
@@ -5,7 +5,11 @@ pub fn build(b: *std.build.Builder) void {
 
     const lib = b.addSharedLibrary("cart", "main.zig", .unversioned);
     lib.setBuildMode(mode);
-    lib.setTarget(.{ .cpu_arch = .wasm32, .os_tag = .freestanding });
+    lib.setTarget(.{
+        .cpu_arch = .wasm32,
+        .os_tag = .freestanding,
+        .cpu_features_add = std.Target.wasm.featureSet(&.{ .nontrapping_fptoint })
+    });
     lib.import_memory = true;
     lib.initial_memory = 262144;
     lib.max_memory = 262144;