https://bugs.llvm.org/show_bug.cgi?id=50697
Bug ID: 50697
Summary: InstCombine breaks calls of casted functions with type
attributes
Product: libraries
Version: 12.0
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: Scalar Optimizations
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
In LLVM 12.0.0, InstCombine can break call instructions of casted functions
when type attributes (byval, sret, etc.) are involved. Example input:
%struct0 = type { i32 }
%struct1 = type { float }
declare void @callee(%struct0* sret(%struct0))
define void @caller() {
%1 = alloca %struct1
call void bitcast (void (%struct0*)* @callee to void (%struct1*)*)(%struct1*
sret(%struct1) %1)
unreachable
}
When run through `opt -S -instcombine`, the output is:
%struct0 = type { i32 }
declare void @callee(%struct0* sret(%struct0))
define void @caller() {
%1 = alloca %struct0, align 8
call void @callee(%struct0* nonnull sret(%struct1) %1)
unreachable
}
This is invalid because the argument type (%struct0*) no longer matches the
attribute type (%struct1).
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