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The comparision "max(x,y)==x" is equivalent to "x>=y". Since the max is

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often expressed as "x >= y ? x : y", there is a good chance we can extract
the existing "x >= y" from it and use that as a replacement for "max(x,y)==x".


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@131049 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Duncan Sands
2011-05-07 16:56:49 +00:00
parent 33c110e602
commit e864b5b840
2 changed files with 92 additions and 10 deletions
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36
test/Transforms/InstSimplify/maxmin.ll
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@@ -231,3 +231,39 @@ define i1 @maxmin8(i32 %x, i32 %y, i32 %z) {
ret i1 %c
; CHECK: ret i1 false
}
define i1 @eqcmp1(i32 %x, i32 %y) {
; CHECK: @eqcmp1
%c = icmp sge i32 %x, %y
%max = select i1 %c, i32 %x, i32 %y
%r = icmp eq i32 %max, %x
ret i1 %r
; CHECK: ret i1 %c
}
define i1 @eqcmp2(i32 %x, i32 %y) {
; CHECK: @eqcmp2
%c = icmp sge i32 %x, %y
%max = select i1 %c, i32 %x, i32 %y
%r = icmp eq i32 %x, %max
ret i1 %r
; CHECK: ret i1 %c
}
define i1 @eqcmp3(i32 %x, i32 %y) {
; CHECK: @eqcmp3
%c = icmp uge i32 %x, %y
%max = select i1 %c, i32 %x, i32 %y
%r = icmp eq i32 %max, %x
ret i1 %r
; CHECK: ret i1 %c
}
define i1 @eqcmp4(i32 %x, i32 %y) {
; CHECK: @eqcmp4
%c = icmp uge i32 %x, %y
%max = select i1 %c, i32 %x, i32 %y
%r = icmp eq i32 %x, %max
ret i1 %r
; CHECK: ret i1 %c
}