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Perform mul combine when multiplying wiht negative constants.

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Patch by Weiming Zhao!
This fixes PR12212


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@153049 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Anton Korobeynikov
2012-03-19 19:19:50 +00:00
parent 23f1cbbd68
commit 2d7ea04e28
2 changed files with 90 additions and 18 deletions
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42
test/CodeGen/ARM/mul_const.ll
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@@ -41,3 +41,45 @@ entry:
ret i32 %0
}
define i32 @tn9(i32 %v) nounwind readnone {
entry:
; CHECK: tn9:
; CHECK: add r0, r0, r0, lsl #3
; CHECK: rsb r0, r0, #0
%0 = mul i32 %v, -9
ret i32 %0
}
define i32 @tn7(i32 %v) nounwind readnone {
entry:
; CHECK: tn7:
; CHECK: sub r0, r0, r0, lsl #3
%0 = mul i32 %v, -7
ret i32 %0
}
define i32 @tn5(i32 %v) nounwind readnone {
entry:
; CHECK: tn5:
; CHECK: add r0, r0, r0, lsl #2
; CHECK: rsb r0, r0, #0
%0 = mul i32 %v, -5
ret i32 %0
}
define i32 @tn3(i32 %v) nounwind readnone {
entry:
; CHECK: tn3:
; CHECK: sub r0, r0, r0, lsl #2
%0 = mul i32 %v, -3
ret i32 %0
}
define i32 @tn12288(i32 %v) nounwind readnone {
entry:
; CHECK: tn12288:
; CHECK: sub r0, r0, r0, lsl #2
; CHECK: lsl{{.*}}#12
%0 = mul i32 %v, -12288
ret i32 %0
}