llvm-6502/test/Analysis/ScalarEvolution/2008-02-15-UMax.ll

; RUN: llvm-as < %s | opt -analyze -scalar-evolution | grep umax
; PR2003

define i32 @foo(i32 %n) {
entry:
        br label %header
header:
        %i = phi i32 [ 100, %entry ], [ %i.inc, %next ]
        %cond = icmp ult i32 %i, %n
        br i1 %cond, label %next, label %return
next:
        %i.inc = add i32 %i, 1
        br label %header
return:
        ret i32 %i
}
Add 'umax' similar to 'smax' SCEV. Closes PR2003. Parse reversed smax and umax as smin and umin and express them with negative or binary-not SCEVs (which are really just subtract under the hood). Parse 'xor %x, -1' as (-1 - %x). Remove dead code (ConstantInt::get always returns a ConstantInt). Don't use getIntegerSCEV(-1, Ty). The first value is an int, then it gets passed into a uint64_t. Instead, create the -1 directly from ConstantInt::getAllOnesValue(). git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47360 91177308-0d34-0410-b5e6-96231b3b80d8 2008-02-20 06:48:22 +00:00			`; RUN: llvm-as < %s \| opt -analyze -scalar-evolution \| grep umax`
			`; PR2003`

			`define i32 @foo(i32 %n) {`
			`entry:`
			`br label %header`
			`header:`
			`%i = phi i32 [ 100, %entry ], [ %i.inc, %next ]`
			`%cond = icmp ult i32 %i, %n`
			`br i1 %cond, label %next, label %return`
			`next:`
			`%i.inc = add i32 %i, 1`
			`br label %header`
			`return:`
			`ret i32 %i`
			`}`