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Use value ranges to fold ext(trunc) in SCEV when possible.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@124062 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nick Lewycky
2011-01-23 06:20:19 +00:00
parent 54cdad97eb
commit 630d85a78c
2 changed files with 68 additions and 0 deletions
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test/Analysis/ScalarEvolution/fold.ll
+34
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@@ -22,3 +22,37 @@ define i8 @test3(i8 %x) {
; CHECK: (3 * %x)
ret i8 %C
}
define void @test4(i32 %x) {
entry:
%0 = icmp sge i32 %x, 0
br i1 %0, label %loop, label %exit
loop:
%A = phi i32 [0, %entry], [%I, %loop]
%rand = icmp sgt i32 %A, 10
%Z = select i1 %rand, i32 %A, i32 10
%B = trunc i32 %Z to i16
%C = sext i16 %B to i30
; CHECK: %C =
; CHECK-NEXT: (trunc i32 (10 smax {0,+,1}<%loop>) to i30)
%D = sext i16 %B to i32
; CHECK: %D =
; CHECK-NEXT: (10 smax {0,+,1}<%loop>)
%E = sext i16 %B to i34
; CHECK: %E =
; CHECK-NEXT: (zext i32 (10 smax {0,+,1}<%loop>) to i34)
%F = zext i16 %B to i30
; CHECK: %F =
; CHECK-NEXT: (trunc i32 (10 smax {0,+,1}<%loop>) to i30
%G = zext i16 %B to i32
; CHECK: %G =
; CHECK-NEXT: (10 smax {0,+,1}<%loop>)
%H = zext i16 %B to i34
; CHECK: %H =
; CHECK-NEXT: (zext i32 (10 smax {0,+,1}<%loop>) to i34)
%I = add i32 %A, 1
%1 = icmp ne i32 %A, 20
br i1 %1, label %loop, label %exit
exit:
ret void
}