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When possible, use "mvn ra, rb" instead of "eor ra, rb, -1" because mvn has a narrow version and eor(i) does not. 

llvm-svn: 74355
This commit is contained in:
David Goodwin 2009-06-26 23:13:13 +00:00
parent cf0b47d179
commit 5285817490
2 changed files with 13 additions and 0 deletions
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2
llvm/lib/Target/ARM/ARMInstrThumb2.td
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@ -482,6 +482,8 @@ defm t2ORN : T2I_bin_irs<"orn", BinOpFrag<(or node:$LHS, (not node:$RHS))>>;
def : Thumb2Pat<(or GPR:$src, t2_so_imm_not:$imm),
(t2ORNri GPR:$src, t2_so_imm_not:$imm)>;
// Prefer over of t2EORri ra, rb, -1 because mvn has 16-bit version
let AddedComplexity = 1 in
defm t2MVN : T2I_un_irs <"mvn", UnOpFrag<(not node:$Src)>, 1, 1>;
def : Thumb2Pat<(t2_so_imm_not:$src),

11
llvm/test/CodeGen/Thumb2/thumb2-mvn2.ll Normal file
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@ -0,0 +1,11 @@
; RUN: llvm-as < %s | llc -march=thumb -mattr=+thumb2 | grep {mvn\\W*r\[0-9\]*,\\W*r\[0-9\]*} | count 2
define i32 @f1(i32 %a) {
%tmp = xor i32 4294967295, %a
ret i32 %tmp
}
define i32 @f2(i32 %a) {
%tmp = xor i32 %a, 4294967295
ret i32 %tmp
}