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llvm-project/llvm/test/Transforms/IndVarSimplify/masked-iv.ll

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Use "opt < %s" instead of "opt %s" so that opt doesn't print the test filename in the output, which interferes with the tests' grep lines. llvm-svn: 81263
2009-09-09 06:57:49 +08:00
; RUN: opt < %s -indvars -S > %t
Remove the code from IVUsers that attempted to handle casted induction variables in cases where the cast isn't foldable. It ended up being a pessimization in many cases. This could be fixed, but it would require a bunch of complicated code in IVUsers' clients. The advantages of this approach aren't visible enough to justify it at this time. llvm-svn: 73706
2009-06-19 00:54:06 +08:00
; RUN: not grep trunc %t
; RUN: grep and %t | count 1
Teach SCEVExpander's visitAddRecExpr to reuse an existing canonical induction variable when the addrec to be expanded does not require a wider type. This eliminates the need for IndVarSimplify to micro-manage SCEV expansions, because SCEVExpander now automatically expands them in the form that IndVarSimplify considers to be canonical. (LSR still micro-manages its SCEV expansions, because it's optimizing for the target, rather than for other optimizations.) Also, this uses the new getAnyExtendExpr, which has more clever expression simplification logic than the IndVarSimplify code it replaces, and this cleans up some ugly expansions in code such as the included masked-iv.ll testcase. llvm-svn: 73294
2009-06-14 00:25:49 +08:00
; Indvars should do the IV arithmetic in the canonical IV type (i64),
; and only use one truncation.
define void @foo(i64* %A, i64* %B, i64 %n, i64 %a, i64 %s) nounwind {
entry:
%t0 = icmp sgt i64 %n, 0 ; <i1> [#uses=1]
br i1 %t0, label %bb.preheader, label %return
bb.preheader: ; preds = %entry
br label %bb
bb: ; preds = %bb, %bb.preheader
%i.01 = phi i64 [ %t6, %bb ], [ %a, %bb.preheader ] ; <i64> [#uses=3]
%t1 = and i64 %i.01, 255 ; <i64> [#uses=1]
%t2 = getelementptr i64* %A, i64 %t1 ; <i64*> [#uses=1]
store i64 %i.01, i64* %t2, align 8
%t6 = add i64 %i.01, %s ; <i64> [#uses=1]
br label %bb
return: ; preds = %entry
ret void
}