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llvm-mirror/test/Transforms/InstCombine/add-shrink.ll
Dan Gohman 795e3db7ce Code that checks WillNotOverflowSignedAdd before creating an Add
can safely use the NSW bit on the Add.

llvm-svn: 85164
2009-10-26 22:14:22 +00:00

15 lines
430 B
LLVM

; RUN: opt < %s -instcombine -S | grep {add nsw i32}
; RUN: opt < %s -instcombine -S | grep sext | count 1
; Should only have one sext and the add should be i32 instead of i64.
define i64 @test1(i32 %A) {
%B = ashr i32 %A, 7 ; <i32> [#uses=1]
%C = ashr i32 %A, 9 ; <i32> [#uses=1]
%D = sext i32 %B to i64 ; <i64> [#uses=1]
%E = sext i32 %C to i64 ; <i64> [#uses=1]
%F = add i64 %D, %E ; <i64> [#uses=1]
ret i64 %F
}