http://llvm.org/bugs/show_bug.cgi?id=19270
Bug ID: 19270
Summary: Check address space when optimizing gep+cast
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: Scalar Optimizations
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
Created attachment 12304
--> http://llvm.org/bugs/attachment.cgi?id=12304&action=edit
unoptimized
visitGetElementPtr in InstructionCombining.cpp gets rid of unnecessary pointer
casts in gep (cast X). However, this optimization may change the address space
of the result pointer type, and cause type mismatch.
I attached a very simple test to reproduce this issue. Run:
opt -S -O3 gep.ll -o gep.opt.ll
opt -verify gep.opt.ll -disable-output
The verifier will complain about the type mismatch.
I attached a patch that disables this optimization when the address space of
the source is different from that of the destination. If it looks good to you,
I'll send it to llvm-commits for review.
Jingyue
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