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Peephole optimization for ABS on ARM.

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Patch by Ana Pazos!


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@141365 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Anton Korobeynikov
2011-10-07 16:15:08 +00:00
parent 3f329cb781
commit 244455e6d6
6 changed files with 174 additions and 7 deletions
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11
test/CodeGen/Thumb/iabs.ll
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@@ -3,9 +3,9 @@
;; Integer absolute value, should produce something as good as:
;; Thumb:
;; asr r2, r0, #31
;; add r0, r0, r2
;; eor r0, r2
;; movs r0, r0
;; bpl
;; rsb r0, r0, #0 (with opitmization, bpl + rsb is if-converted into rsbmi)
;; bx lr
define i32 @test(i32 %a) {
@@ -13,5 +13,10 @@ define i32 @test(i32 %a) {
%b = icmp sgt i32 %a, -1
%abs = select i1 %b, i32 %a, i32 %tmp1neg
ret i32 %abs
; CHECK: movs r0, r0
; CHECK: bpl
; CHECK: rsb r0, r0, #0
; CHECK: bx lr
}