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llvm-6502/test/Transforms/LICM/2007-10-01-PromoteSafeValue.ll
Eli Friedman 0e382192c1 PR9634: Don't unconditionally tell the AliasSetTracker that the PreheaderLoad
is equivalent to any other relevant value; it isn't true in general.
If it is equivalent, the LoopPromoter will tell the AST the equivalence.
Also, delete the PreheaderLoad if it is unused.

Chris, since you were the last one to make major changes here, can you check
that this is sane?



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@129049 91177308-0d34-0410-b5e6-96231b3b80d8
2011-04-07 01:35:06 +00:00

24 lines
576 B
LLVM

; RUN: opt < %s -licm -S | FileCheck %s
; Promote value if at least one use is safe
define i32 @f2(i32* %p, i8* %q) {
entry:
br label %loop.head
loop.head: ; preds = %cond.true, %entry
store i32 20, i32* %p
%tmp3.i = icmp eq i8* null, %q ; <i1> [#uses=1]
br i1 %tmp3.i, label %exit, label %cond.true
cond.true: ; preds = %loop.head
store i32 40, i32* %p
br label %loop.head
; CHECK: exit:
; CHECK: store i32 20, i32* %p
exit: ; preds = %loop.head
ret i32 0
}