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[SystemZ] Try to fold shifts into TMxx

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E.g. "SRL %r2, 2; TMLL %r2, 1" => "TMLL %r2, 4".


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@190672 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Richard Sandiford
2013-09-13 09:09:50 +00:00
parent 9a8392b8ac
commit 856bf59433
3 changed files with 137 additions and 20 deletions
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40
test/CodeGen/SystemZ/int-cmp-47.ll
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@@ -191,3 +191,43 @@ store:
exit:
ret void
}
; Check that we can fold an SHL into a TMxx mask.
define void @f11(i64 %a) {
; CHECK-LABEL: f11:
; CHECK: tmhl %r2, 32768
; CHECK: jne {{\.L.*}}
; CHECK: br %r14
entry:
%shl = shl i64 %a, 1
%and = and i64 %shl, 281474976710656
%cmp = icmp ne i64 %and, 0
br i1 %cmp, label %exit, label %store
store:
store i32 1, i32 *@g
br label %exit
exit:
ret void
}
; Check that we can fold an SHR into a TMxx mask.
define void @f12(i64 %a) {
; CHECK-LABEL: f12:
; CHECK: tmhh %r2, 256
; CHECK: jne {{\.L.*}}
; CHECK: br %r14
entry:
%shr = lshr i64 %a, 56
%and = and i64 %shr, 1
%cmp = icmp ne i64 %and, 0
br i1 %cmp, label %exit, label %store
store:
store i32 1, i32 *@g
br label %exit
exit:
ret void
}