bjoernager/rust
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bors ee86f96ba1 Auto merge of #85828 - scottmcm:raw-eq, r=oli-obk 
Stop generating `alloca`s & `memcmp` for simple short array equality

Example:
```rust
pub fn demo(x: [u16; 6], y: [u16; 6]) -> bool { x == y }
```

Before:
```llvm
define zeroext i1 `@_ZN10playground4demo17h48537f7eac23948fE(i96` %0, i96 %1) unnamed_addr #0 {
start:
  %y = alloca [6 x i16], align 8
  %x = alloca [6 x i16], align 8
  %.0..sroa_cast = bitcast [6 x i16]* %x to i96*
  store i96 %0, i96* %.0..sroa_cast, align 8
  %.0..sroa_cast3 = bitcast [6 x i16]* %y to i96*
  store i96 %1, i96* %.0..sroa_cast3, align 8
  %_11.i.i.i = bitcast [6 x i16]* %x to i8*
  %_14.i.i.i = bitcast [6 x i16]* %y to i8*
  %bcmp.i.i.i = call i32 `@bcmp(i8*` nonnull dereferenceable(12) %_11.i.i.i, i8* nonnull dereferenceable(12) %_14.i.i.i, i64 12) #2, !alias.scope !2
  %2 = icmp eq i32 %bcmp.i.i.i, 0
  ret i1 %2
}
```
```x86
playground::demo: # `@playground::demo`
	sub	rsp, 32
	mov	qword ptr [rsp], rdi
	mov	dword ptr [rsp + 8], esi
	mov	qword ptr [rsp + 16], rdx
	mov	dword ptr [rsp + 24], ecx
	xor	rdi, rdx
	xor	esi, ecx
	or	rsi, rdi
	sete	al
	add	rsp, 32
	ret
```

After:
```llvm
define zeroext i1 `@_ZN4mini4demo17h7a8994aaa314c981E(i96` %0, i96 %1) unnamed_addr #0 {
start:
  %2 = icmp eq i96 %0, %1
  ret i1 %2
}
```
```x86
_ZN4mini4demo17h7a8994aaa314c981E:
	xor	rcx, r8
	xor	edx, r9d
	or	rdx, rcx
	sete	al
	ret
```
2021-07-09 09:16:27 +00:00
..
rustc
rustc_apfloat Use HTTPS links where possible 2021-06-23 16:26:46 -04:00
rustc_arena
rustc_ast Rework SESSION_GLOBALS API to prevent overwriting it 2021-07-08 16:16:28 +02:00
rustc_ast_lowering Arena-allocate Crate during lowering. 2021-06-30 20:31:56 +02:00
rustc_ast_passes Auto merge of #86164 - FabianWolff:issue-86053, r=davidtwco 2021-06-17 06:34:12 +00:00
rustc_ast_pretty Rework SESSION_GLOBALS API to prevent overwriting it 2021-07-08 16:16:28 +02:00
rustc_attr remove cfg(bootstrap) 2021-05-24 11:07:48 -04:00
rustc_builtin_macros Auto merge of #86599 - Amanieu:asm_raw, r=nagisa 2021-06-25 20:44:28 +00:00
rustc_codegen_cranelift Use cranelift's Type::int instead of doing the match myself 2021-07-08 14:55:58 -07:00
rustc_codegen_llvm Adjust the threshold to look at the ABI, not just the size 2021-07-08 14:55:59 -07:00
rustc_codegen_ssa Auto merge of #86105 - bjorn3:link_info_refactor, r=petrochenkov 2021-07-07 18:28:53 +00:00
rustc_data_structures rustc_data_structures: Drop unused dependency on crossbeam-utils 2021-06-25 01:03:16 -07:00
rustc_driver Auto merge of #80182 - in42:stack_trace, r=tmandry 2021-07-02 05:40:51 +00:00
rustc_error_codes Rollup merge of #86838 - lambinoo:I-69630-rust_const_unstable_check_const, r=oli-obk 2021-07-08 18:30:34 +02:00
rustc_errors Rework SESSION_GLOBALS API to prevent overwriting it 2021-07-08 16:16:28 +02:00
rustc_expand Rework SESSION_GLOBALS API to prevent overwriting it 2021-07-08 16:16:28 +02:00
rustc_feature Panic on trying to find non-feature incompleteness 2021-06-28 18:37:54 -04:00
rustc_fs_util
rustc_graphviz Use HTTPS links where possible 2021-06-23 16:26:46 -04:00
rustc_hir Rollup merge of #86726 - sexxi-goose:use-diagnostic-item-for-rfc2229-migration, r=nikomatsakis 2021-07-08 18:30:33 +02:00
rustc_hir_pretty Rollup merge of #86358 - klensy:pp-loop, r=Mark-Simulacrum 2021-06-29 00:26:55 +09:00
rustc_incremental Revert "Revert "Merge CrateDisambiguator into StableCrateId"" 2021-07-06 11:28:04 +02:00
rustc_index Remove unused feature gates 2021-05-31 13:55:43 +02:00
rustc_infer remove unused Option 2021-07-04 11:09:32 -04:00
rustc_interface Rework SESSION_GLOBALS API to prevent overwriting it 2021-07-08 16:16:28 +02:00
rustc_lexer Rename 'bad prefix' to 'unknown prefix'. 2021-06-26 23:11:14 +08:00
rustc_lint Update to last upstream version 2021-07-08 17:14:28 +02:00
rustc_lint_defs rename rust_2021_token_prefixes to rust_2021_prefixes_incompatible_syntax 2021-07-06 20:13:36 +02:00
rustc_llvm Auto merge of #84171 - ricobbe:raw-dylib-via-llvm, r=petrochenkov 2021-06-06 03:59:17 +00:00
rustc_macros Lint for unused borrows as part of UNUSED_MUST_USE 2021-06-18 15:09:40 +08:00
rustc_metadata Revert "Revert "Merge CrateDisambiguator into StableCrateId"" 2021-07-06 11:28:04 +02:00
rustc_middle Auto merge of #86105 - bjorn3:link_info_refactor, r=petrochenkov 2021-07-07 18:28:53 +00:00
rustc_mir PR feedback 2021-07-08 14:55:57 -07:00
rustc_mir_build fixup! Editon 2021 enables precise capture 2021-06-27 21:46:55 -04:00
rustc_parse Rollup merge of #86932 - rylev:fix-ice-86895, r=estebank 2021-07-08 10:44:34 +09:00
rustc_parse_format Rework SESSION_GLOBALS API to prevent overwriting it 2021-07-08 16:16:28 +02:00
rustc_passes Rollup merge of #86838 - lambinoo:I-69630-rust_const_unstable_check_const, r=oli-obk 2021-07-08 18:30:34 +02:00
rustc_plugin_impl Use () for plugin_registrar_fn. 2021-05-12 13:58:43 +02:00
rustc_privacy Add more tests + visit_ty in some places 2021-06-09 19:28:41 +01:00
rustc_query_impl rustc_query_impl: Remove unused dependencies 2021-06-25 01:13:00 -07:00
rustc_query_system Auto merge of #85154 - cjgillot:lessfn, r=bjorn3 2021-06-15 14:52:58 +00:00
rustc_resolve Auto merge of #86143 - bjorn3:revert_revert_merge_crate_disambiguator, r=michaelwoerister 2021-07-06 11:31:59 +00:00
rustc_save_analysis Revert "Revert "Merge CrateDisambiguator into StableCrateId"" 2021-07-06 11:28:04 +02:00
rustc_serialize Emit warnings for unused fields in custom targets. 2021-06-17 21:48:02 +02:00
rustc_session Auto merge of #86572 - rylev:force-warnings-always, r=nikomatsakis 2021-07-06 16:50:33 +00:00
rustc_span Auto merge of #85828 - scottmcm:raw-eq, r=oli-obk 2021-07-09 09:16:27 +00:00
rustc_symbol_mangling Revert "Revert "Merge CrateDisambiguator into StableCrateId"" 2021-07-06 11:28:04 +02:00
rustc_target Replace per-target ABI denylist with an allowlist 2021-07-06 13:12:15 +03:00
rustc_trait_selection Rollup merge of #86726 - sexxi-goose:use-diagnostic-item-for-rfc2229-migration, r=nikomatsakis 2021-07-08 18:30:33 +02:00
rustc_traits Combine individual limit queries into single limits query 2021-07-04 13:02:51 -05:00
rustc_ty_utils Revert "Revert "Merge CrateDisambiguator into StableCrateId"" 2021-07-06 11:28:04 +02:00
rustc_type_ir Remove unused feature gates 2021-05-31 13:55:43 +02:00
rustc_typeck Auto merge of #85828 - scottmcm:raw-eq, r=oli-obk 2021-07-09 09:16:27 +00:00