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Add a test case for a particular udiv/select transform. 

llvm-svn: 34935
This commit is contained in:
Reid Spencer 2007-03-05 22:51:08 +00:00
parent 003a559633
commit 509acc186e
1 changed files with 17 additions and 0 deletions
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17
llvm/test/Transforms/InstCombine/udiv_select_to_select_shift.ll Normal file
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; This tests that this transform:
; udiv X, (Select Cond, C1, C2) --> Select Cond, (shr X, C1), (shr X, C2)
;
; RUN: llvm-as %s -o - | opt -instcombine | llvm-dis -f -o %t && \
; RUN: grep select %t | wc -l | grep 1 && \
; RUN: grep lshr %t | wc -l | grep 2 && \
; RUN: grep udiv %t | wc -l | grep 0
define i64 @test(i64 %X, i1 %Cond ) {
entry:
%divisor1 = select i1 %Cond, i64 8, i64 16
%quotient1 = udiv i64 %X, %divisor1
%divisor2 = select i1 %Cond, i64 8, i64 0
%quotient2 = udiv i64 %X, %divisor2
%sum = add i64 %quotient1, %quotient2
ret i64 %sum
}