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Auto merge of #105582 - saethlin:instcombine-assert-inhabited, r=cjgillot

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InstCombine away intrinsic validity assertions

This optimization (currently) fires 246 times on the standard library. It seems to fire hardly at all on the big crates in the benchmark suite. Interesting.
This commit is contained in:
bors
2023-01-26 03:10:52 +00:00
parent 2a17174ee6 5bfad5cc85
commit 885bf62887
12 changed files with 276 additions and 16 deletions
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4
compiler/rustc_const_eval/src/interpret/intrinsics.rs
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@@ -447,7 +447,7 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
}
if intrinsic_name == sym::assert_zero_valid {
let should_panic = !self.tcx.permits_zero_init(layout);
let should_panic = !self.tcx.permits_zero_init(self.param_env.and(layout));
if should_panic {
M::abort(
@@ -461,7 +461,7 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
}
if intrinsic_name == sym::assert_mem_uninitialized_valid {
let should_panic = !self.tcx.permits_uninit_init(layout);
let should_panic = !self.tcx.permits_uninit_init(self.param_env.and(layout));
if should_panic {
M::abort(