QingShan Zhang
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abbb894ff5
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[PowerPC] Combine ADD to ADDZE
On the ppc64le platform, if ir has the following form,
define i64 @addze1(i64 %x, i64 %z) local_unnamed_addr #0 {
entry:
%cmp = icmp ne i64 %z, CONSTANT (-32767 <= CONSTANT <= 32768)
%conv1 = zext i1 %cmp to i64
%add = add nsw i64 %conv1, %x
ret i64 %add
}
we can optimize it to the form below.
when C == 0
--> addze X, (addic Z, -1))
/
add X, (zext(setne Z, C))--
\ when -32768 <= -C <= 32767 && C != 0
--> addze X, (addic (addi Z, -C), -1)
Patch By: HLJ2009 (Li Jia He)
Differential Revision: https://reviews.llvm.org/D51403
Reviewed By: Nemanjai
llvm-svn: 341634
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2018-09-07 07:56:05 +00:00 |