diff options
Diffstat (limited to 'src/codegen/llvm.zig')
| -rw-r--r-- | src/codegen/llvm.zig | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/src/codegen/llvm.zig b/src/codegen/llvm.zig index 4333b34d98..8857c96bc1 100644 --- a/src/codegen/llvm.zig +++ b/src/codegen/llvm.zig @@ -5432,6 +5432,25 @@ pub const FuncGen = struct { total_i += 1; } } + + // For some targets, Clang unconditionally adds some clobbers to all inline assembly. + // While this is probably not strictly necessary, if we don't follow Clang's lead + // here then we may risk tripping LLVM bugs since anything not used by Clang tends + // to be buggy and regress often. + switch (target.cpu.arch) { + .x86_64, .i386 => { + if (total_i != 0) try llvm_constraints.append(self.gpa, ','); + try llvm_constraints.appendSlice(self.gpa, "~{dirflag},~{fpsr},~{flags}"); + total_i += 3; + }, + .mips, .mipsel, .mips64, .mips64el => { + if (total_i != 0) try llvm_constraints.append(self.gpa, ','); + try llvm_constraints.appendSlice(self.gpa, "~{$1}"); + total_i += 1; + }, + else => {}, + } + const asm_source = std.mem.sliceAsBytes(self.air.extra[extra_i..])[0..extra.data.source_len]; // hackety hacks until stage2 has proper inline asm in the frontend. |