From 593f45ee021f5310d6979f435fa4b6fcfaa5dabf Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Alex=20R=C3=B8nne=20Petersen?= <alex@alexrp.com>
Date: Mon, 19 Jan 2026 20:43:42 +0100
Subject: [PATCH] llvm: switch most targets to using half and fp128 IR types

As of LLVM 22, most backends can (finally) handle legalization of these types as
necessary, so we don't need to do it ourselves anymore.

closes https://github.com/ziglang/zig/issues/23674
---
 lib/compiler_rt.zig  | 23 +----------------------
 src/codegen/llvm.zig | 19 -------------------
 2 files changed, 1 insertion(+), 41 deletions(-)

diff --git a/lib/compiler_rt.zig b/lib/compiler_rt.zig
index 501d35f0a280b79d96ebf0fd7ed993cbeaecdb9c..9e62f047bb732cfd1f604df15ab9c1b721adc01b 100644
--- a/lib/compiler_rt.zig
+++ b/lib/compiler_rt.zig
@@ -447,29 +447,8 @@ pub const gnu_f16_abi = switch (builtin.cpu.arch) {
 
 pub const want_sparc_abi = builtin.cpu.arch.isSPARC();
 
-/// This seems to mostly correspond to `clang::TargetInfo::HasFloat16`.
 pub fn F16T(comptime OtherType: type) type {
     return switch (builtin.cpu.arch) {
-        .amdgcn,
-        .arm,
-        .armeb,
-        .thumb,
-        .thumbeb,
-        .aarch64,
-        .aarch64_be,
-        .hexagon,
-        .loongarch32,
-        .loongarch64,
-        .nvptx,
-        .nvptx64,
-        .riscv32,
-        .riscv32be,
-        .riscv64,
-        .riscv64be,
-        .s390x,
-        .spirv32,
-        .spirv64,
-        => f16,
         .x86, .x86_64 => if (builtin.target.os.tag.isDarwin()) switch (OtherType) {
             // Starting with LLVM 16, Darwin uses different abi for f16
             // depending on the type of the other return/argument..???
@@ -477,7 +456,7 @@ pub fn F16T(comptime OtherType: type) type {
             f80, f128 => f16,
             else => unreachable,
         } else f16,
-        else => u16,
+        else => f16,
     };
 }
 
diff --git a/src/codegen/llvm.zig b/src/codegen/llvm.zig
index f1fc2a8719e0987481ff3610bc4562b8a6719eb1..4f1da37e9f2a59bbf61d43d99efd5805d2442d7e 100644
--- a/src/codegen/llvm.zig
+++ b/src/codegen/llvm.zig
@@ -4646,20 +4646,6 @@ fn toLlvmGlobalAddressSpace(wanted_address_space: std.builtin.AddressSpace, targ
 /// or if it produces miscompilations.
 pub fn backendSupportsF16(target: *const std.Target) bool {
     return switch (target.cpu.arch) {
-        // https://github.com/llvm/llvm-project/issues/97981
-        .csky,
-        // https://github.com/llvm/llvm-project/issues/97981
-        .powerpc,
-        .powerpcle,
-        .powerpc64,
-        .powerpc64le,
-        // https://github.com/llvm/llvm-project/issues/97981
-        .wasm32,
-        .wasm64,
-        // https://github.com/llvm/llvm-project/issues/97981
-        .sparc,
-        .sparc64,
-        => false,
         .arm,
         .armeb,
         .thumb,
@@ -4686,11 +4672,6 @@ pub fn backendSupportsF128(target: *const std.Target) bool {
     return switch (target.cpu.arch) {
         // https://github.com/llvm/llvm-project/issues/121122
         .amdgcn,
-        // Test failures all over the place.
-        .mips64,
-        .mips64el,
-        // https://github.com/llvm/llvm-project/issues/41838
-        .sparc,
         => false,
         .arm,
         .armeb,
-- 
2.54.0