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Generalize the zext(trunc(t) & C) instcombine to work even with

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C is not a low-bits mask, and add a similar instcombine for
zext((trunc(t) & C) ^ C).


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@73705 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman
2009-06-18 16:30:21 +00:00
parent 6864db6fac
commit fd3daa74c2
2 changed files with 37 additions and 9 deletions
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17
test/Transforms/InstCombine/trunc-mask-ext.ll
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@@ -2,7 +2,7 @@
; RUN: not grep zext %t
; RUN: not grep sext %t
; Instcombine should be able to eliminate both ext casts.
; Instcombine should be able to eliminate all of these ext casts.
declare void @use(i32)
@@ -21,3 +21,18 @@ define i64 @bar(i64 %a) {
call void @use(i32 %b)
ret i64 %d
}
define i64 @goo(i64 %a) {
%b = trunc i64 %a to i32
%c = and i32 %b, 8
%d = zext i32 %c to i64
call void @use(i32 %b)
ret i64 %d
}
define i64 @hoo(i64 %a) {
%b = trunc i64 %a to i32
%c = and i32 %b, 8
%x = xor i32 %c, 8
%d = zext i32 %x to i64
call void @use(i32 %b)
ret i64 %d
}