http://llvm.org/bugs/show_bug.cgi?id=11018
Summary: ARM byval is actually by reference
Product: libraries
Version: trunk
Platform: PC
OS/Version: Linux
Status: NEW
Severity: normal
Priority: P
Component: Backend: ARM
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
The attached byval_is_ref.ll demonstrates how byval is actually passed by
reference in this case. Modifying the parameter in the callee affects the value
in the caller. The return value of main is 55 instead of 0.
Compile with:
$ llc -march=arm -mtriple=armv7a-none-linux-gnueabi byval_is_ref.ll
The reason for this behavior:
CCValAssign::isRegLoc() returns true for the byval argument. In
ARMTargetLowering::LowerCall(), this causes a pointer to the struct be passed,
instead of following the IsByVal case.
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