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Avoid wrapping constant allocations in packed structs when not necessary

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This way LLVM will set the string merging flag if the alloc is a nul
terminated string, reducing binary sizes.
This commit is contained in:
bjorn3 2025-03-14 15:56:33 +00:00
parent f7b4354283
commit a5fa12b6b9
8 changed files with 26 additions and 25 deletions
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6
tests/codegen/uninit-consts.rs
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@ -11,15 +11,15 @@ pub struct PartiallyUninit {
y: MaybeUninit<[u8; 10]>,
}
// CHECK: [[FULLY_UNINIT:@.*]] = private unnamed_addr constant <{ [10 x i8] }> undef
// CHECK: [[FULLY_UNINIT:@.*]] = private unnamed_addr constant [10 x i8] undef
// CHECK: [[PARTIALLY_UNINIT:@.*]] = private unnamed_addr constant <{ [4 x i8], [12 x i8] }> <{ [4 x i8] c"{{\\EF\\BE\\AD\\DE|\\DE\\AD\\BE\\EF}}", [12 x i8] undef }>, align 4
// This shouldn't contain undef, since it contains more chunks
// than the default value of uninit_const_chunk_threshold.
// CHECK: [[UNINIT_PADDING_HUGE:@.*]] = private unnamed_addr constant <{ [32768 x i8] }> <{ [32768 x i8] c"{{.+}}" }>, align 4
// CHECK: [[UNINIT_PADDING_HUGE:@.*]] = private unnamed_addr constant [32768 x i8] c"{{.+}}", align 4
// CHECK: [[FULLY_UNINIT_HUGE:@.*]] = private unnamed_addr constant <{ [16384 x i8] }> undef
// CHECK: [[FULLY_UNINIT_HUGE:@.*]] = private unnamed_addr constant [16384 x i8] undef
// CHECK-LABEL: @fully_uninit
#[no_mangle]