From 3b583400734faeaf5e7e13e0bfbc7fddec0f9a00 Mon Sep 17 00:00:00 2001
From: Kajetan Puchalski <kajetan.puchalski@arm.com>
Date: Wed, 5 Feb 2025 15:24:53 +0000
Subject: [PATCH] intrinsic-test: Print C++ float16_t in hex

Upstream Rust currently does not support printing f16s in decimal.
For the intrinsics tests to work, make C++ print float16_t in the same
format.

Can be droppen once https://github.com/rust-lang/rust/pull/127013
is merged.
---
 .../stdarch/crates/intrinsic-test/missing_aarch64.txt    | 3 +++
 library/stdarch/crates/intrinsic-test/src/main.rs        | 9 +++++++++
 2 files changed, 12 insertions(+)

diff --git a/library/stdarch/crates/intrinsic-test/missing_aarch64.txt b/library/stdarch/crates/intrinsic-test/missing_aarch64.txt
index 4784a0decbd3..ff13fcf4fc6a 100644
--- a/library/stdarch/crates/intrinsic-test/missing_aarch64.txt
+++ b/library/stdarch/crates/intrinsic-test/missing_aarch64.txt
@@ -27,3 +27,6 @@ vrnd64z_f64
 
 # Broken in Clang
 vcvth_s16_f16
+# FIXME: Broken output due to missing f16 printing support in Rust, see git blame for this line
+vmulh_lane_f16
+vmulh_laneq_f16
diff --git a/library/stdarch/crates/intrinsic-test/src/main.rs b/library/stdarch/crates/intrinsic-test/src/main.rs
index 57df40bb2fda..a64e264d8b1b 100644
--- a/library/stdarch/crates/intrinsic-test/src/main.rs
+++ b/library/stdarch/crates/intrinsic-test/src/main.rs
@@ -114,6 +114,15 @@ std::ostream& operator<<(std::ostream& os, poly128_t value) {{
 }}
 #endif
 
+std::ostream& operator<<(std::ostream& os, float16_t value) {{
+    uint16_t temp = 0;
+    memcpy(&temp, &value, sizeof(float16_t));
+    std::stringstream ss;
+    ss << "0x" << std::setfill('0') << std::setw(4) << std::hex << temp;
+    os << ss.str();
+    return os;
+}}
+
 {arglists}
 
 int main(int argc, char **argv) {{