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New InstCombine pattern: (icmp ult/ule (A + C1), C3) | (icmp ult/ule (A + C2), C3) to (icmp ult/ule ((A & ~(C1 ^ C2)) + max(C1, C2)), C3) under certain condition

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216135 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Yi Jiang
2014-08-20 22:55:40 +00:00
parent 9ec471a5d8
commit ee1b45f2a2
2 changed files with 81 additions and 0 deletions
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test/Transforms/InstCombine/or.ll
+26
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@@ -480,3 +480,29 @@ define i32 @test45(i32 %x, i32 %y, i32 %z) {
%or1 = or i32 %and, %y
ret i32 %or1
}
define i1 @test46(i8 signext %c) {
%c.off = add i8 %c, -97
%cmp1 = icmp ult i8 %c.off, 26
%c.off17 = add i8 %c, -65
%cmp2 = icmp ult i8 %c.off17, 26
%or = or i1 %cmp1, %cmp2
ret i1 %or
; CHECK-LABEL: @test46(
; CHECK-NEXT: and i8 %c, -33
; CHECK-NEXT: add i8 %1, -65
; CHECK-NEXT: icmp ult i8 %2, 26
}
define i1 @test47(i8 signext %c) {
%c.off = add i8 %c, -65
%cmp1 = icmp ule i8 %c.off, 26
%c.off17 = add i8 %c, -97
%cmp2 = icmp ule i8 %c.off17, 26
%or = or i1 %cmp1, %cmp2
ret i1 %or
; CHECK-LABEL: @test47(
; CHECK-NEXT: and i8 %c, -33
; CHECK-NEXT: add i8 %1, -65
; CHECK-NEXT: icmp ult i8 %2, 27
}