llvm-mirror/test/Analysis/ScalarEvolution/2008-02-11-ReversedCondition.ll

; RUN: llvm-as < %s | opt -scalar-evolution -analyze | grep {Loop header: (0 smax %n) iterations!}

define void @foo(i32 %n) {
entry:
	br label %header
header:
	%i = phi i32 [ 0, %entry ], [ %i.inc, %next ]
	%cond = icmp sgt i32 %n, %i
	br i1 %cond, label %next, label %return
next:
        %i.inc = add i32 %i, 1
	br label %header
return:
	ret void
}
Fix spacing in the grep line for this test, following the recent SCEV-whitespace changes. llvm-svn: 56234 2008-09-16 03:37:08 +02:00			`; RUN: llvm-as < %s \| opt -scalar-evolution -analyze \| grep {Loop header: (0 smax %n) iterations!}`
If the LHS of the comparison is a loop-invariant we also want to move it to the RHS. This simple change allows to compute loop iteration count for loops with condition similar to the one in the testcase (which seems to be quite common). llvm-svn: 46959 2008-02-11 19:37:34 +01:00
			`define void @foo(i32 %n) {`
			`entry:`
			`br label %header`
			`header:`
			`%i = phi i32 [ 0, %entry ], [ %i.inc, %next ]`
			`%cond = icmp sgt i32 %n, %i`
			`br i1 %cond, label %next, label %return`
			`next:`
			`%i.inc = add i32 %i, 1`
			`br label %header`
			`return:`
			`ret void`
			`}`