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interp: add regression test for partial store aliasing

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Adds a third init function to the store testdata: an initial partial
store puts the buffer into the current memory view, then a partial load
is followed by another partial store at the same offset, and finally the
loaded value is written to a separate global.

The expected output captures the current (incorrect) behavior of the
in-place partial store optimization: the loaded value gets corrupted by
the subsequent in-place store. The next commit fixes this.
This commit is contained in:
Jake Bailey
2026-05-11 13:40:58 -07:00
committed by Ron Evans
parent f5bd750a4d
commit c980e48ad4
2 changed files with 19 additions and 0 deletions
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interp/testdata/store.ll
Vendored
+17
View File
@@ -4,11 +4,14 @@ target triple = "x86_64--linux"
@overlap.buf = global [4 x i8] c"\01\02\03\04"
@alias.src = global [4 x i8] c"\05\06\07\08"
@alias.dst = global [2 x i8] zeroinitializer
@reload.buf = global [4 x i8] c"\01\02\03\04"
@reload.out = global [2 x i8] zeroinitializer
define void @runtime.initAll() unnamed_addr {
entry:
call void @overlap.init(ptr undef)
call void @alias.init(ptr undef)
call void @reload.init(ptr undef)
ret void
}
@@ -30,3 +33,17 @@ entry:
store i8 9, ptr @alias.dst
ret void
}
define internal void @reload.init(ptr %context) unnamed_addr {
entry:
; First store makes reload.buf writable in the current memory view.
%tail = getelementptr [4 x i8], ptr @reload.buf, i32 0, i32 3
store i8 9, ptr %tail
; Partial load whose result may share the underlying buffer.
%val = load i16, ptr @reload.buf
; Subsequent in-place partial store; this must not corrupt %val.
store i8 99, ptr @reload.buf
; Write the originally-loaded value to a separate global.
store i16 %val, ptr @reload.out
ret void
}
interp/testdata/store.out.ll
Vendored
+2
View File
@@ -4,6 +4,8 @@ target triple = "x86_64--linux"
@overlap.buf = local_unnamed_addr global [4 x i8] c"\01\01\02\09"
@alias.src = local_unnamed_addr global [4 x i8] c"\05\06\07\08"
@alias.dst = local_unnamed_addr global [2 x i8] c"\09\07"
@reload.buf = local_unnamed_addr global [4 x i8] c"c\02\03\09"
@reload.out = local_unnamed_addr global [2 x i8] c"c\02"
define void @runtime.initAll() unnamed_addr {
entry: