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Merge commit '6ba33f5e1189a5ae58fb96ce3546e76b13d090f5' into subtree-update_cg_gcc_2025-05-14

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Guillaume Gomez
2025-05-14 13:51:02 +02:00
parent 414482f6a0 6ba33f5e11
commit 1c4ab86955
29 changed files with 909 additions and 247 deletions
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25
compiler/rustc_codegen_gcc/src/builder.rs
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@@ -568,11 +568,28 @@ impl<'a, 'gcc, 'tcx> BuilderMethods<'a, 'tcx> for Builder<'a, 'gcc, 'tcx> {
) {
let mut gcc_cases = vec![];
let typ = self.val_ty(value);
for (on_val, dest) in cases {
let on_val = self.const_uint_big(typ, on_val);
gcc_cases.push(self.context.new_case(on_val, on_val, dest));
// FIXME(FractalFir): This is a workaround for a libgccjit limitation.
// Currently, libgccjit can't directly create 128 bit integers.
// Since switch cases must be values, and casts are not constant, we can't use 128 bit switch cases.
// In such a case, we will simply fall back to an if-ladder.
// This *may* be slower than a native switch, but a slow working solution is better than none at all.
if typ.is_i128(self) || typ.is_u128(self) {
for (on_val, dest) in cases {
let on_val = self.const_uint_big(typ, on_val);
let is_case =
self.context.new_comparison(self.location, ComparisonOp::Equals, value, on_val);
let next_block = self.current_func().new_block("case");
self.block.end_with_conditional(self.location, is_case, dest, next_block);
self.block = next_block;
}
self.block.end_with_jump(self.location, default_block);
} else {
for (on_val, dest) in cases {
let on_val = self.const_uint_big(typ, on_val);
gcc_cases.push(self.context.new_case(on_val, on_val, dest));
}
self.block.end_with_switch(self.location, value, default_block, &gcc_cases);
}
self.block.end_with_switch(self.location, value, default_block, &gcc_cases);
}
#[cfg(feature = "master")]