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add comments about why we choose pentium4 for i386 target

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See #3389
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Andrew Kelley 2019-10-09 15:06:22 -04:00
parent 2286003666
commit a5714ddb97
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1 changed files with 5 additions and 0 deletions
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src/codegen.cpp
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@ -8728,6 +8728,11 @@ static void init(CodeGen *g) {
target_specific_cpu_args = "";
target_specific_features = riscv_default_features;
} else if (g->zig_target->arch == ZigLLVM_x86) {
// This is because we're really targeting i686 rather than i386.
// It's pretty much impossible to use many of the language features
// such as fp16 if you stick use the x87 only. This is also what clang
// uses as base cpu.
// TODO https://github.com/ziglang/zig/issues/2883
target_specific_cpu_args = "pentium4";
target_specific_features = "";
} else {