bjoernager/rust
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Also use gep inbounds nuw for index projections

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This commit is contained in:
Nikita Popov 2025-02-19 15:14:12 +01:00
parent 31cc4c074d
commit 9e7b1847dc
2 changed files with 3 additions and 3 deletions
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2
compiler/rustc_codegen_ssa/src/mir/place.rs
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@ -423,7 +423,7 @@ impl<'a, 'tcx, V: CodegenObject> PlaceRef<'tcx, V> {
layout.size layout.size
}; };
let llval = bx.inbounds_gep(bx.cx().backend_type(layout), self.val.llval, &[llindex]); let llval = bx.inbounds_nuw_gep(bx.cx().backend_type(layout), self.val.llval, &[llindex]);
let align = self.val.align.restrict_for_offset(offset); let align = self.val.align.restrict_for_offset(offset);
PlaceValue::new_sized(llval, align).with_type(layout) PlaceValue::new_sized(llval, align).with_type(layout)
} }

4
tests/codegen/gep-index.rs
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@ -11,7 +11,7 @@ struct Foo(i32, i32);
// CHECK-LABEL: @index_on_struct( // CHECK-LABEL: @index_on_struct(
#[no_mangle] #[no_mangle]
fn index_on_struct(a: &[Foo], index: usize) -> &Foo { fn index_on_struct(a: &[Foo], index: usize) -> &Foo {
// CHECK: getelementptr inbounds %Foo, ptr %a.0, {{i64|i32}} %index // CHECK: getelementptr inbounds{{( nuw)?}} %Foo, ptr %a.0, {{i64|i32}} %index
&a[index] &a[index]
} }
@ -25,7 +25,7 @@ fn offset_on_struct(a: *const Foo, index: usize) -> *const Foo {
// CHECK-LABEL: @index_on_i32( // CHECK-LABEL: @index_on_i32(
#[no_mangle] #[no_mangle]
fn index_on_i32(a: &[i32], index: usize) -> &i32 { fn index_on_i32(a: &[i32], index: usize) -> &i32 {
// CHECK: getelementptr inbounds i32, ptr %a.0, {{i64|i32}} %index // CHECK: getelementptr inbounds{{( nuw)?}} i32, ptr %a.0, {{i64|i32}} %index
&a[index] &a[index]
} }