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cdf43b1fad
and the compaison is against a constant value, try eliminate the stride by moving the compare instruction to another stride and change its constant operand accordingly. e.g. loop: ... v1 = v1 + 3 v2 = v2 + 1 if (v2 < 10) goto loop => loop: ... v1 = v1 + 3 if (v1 < 30) goto loop git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@43336 91177308-0d34-0410-b5e6-96231b3b80d8
50 lines
2.3 KiB
LLVM
50 lines
2.3 KiB
LLVM
; RUN: llvm-as < %s | llc -march=x86 | grep cmp | grep 64
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; RUN: llvm-as < %s | llc -march=x86 | not grep inc
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@state = external global [0 x i32] ; <[0 x i32]*> [#uses=4]
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@S = external global [0 x i32] ; <[0 x i32]*> [#uses=4]
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define i32 @foo() {
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entry:
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br label %bb
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bb: ; preds = %bb, %entry
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%indvar = phi i32 [ 0, %entry ], [ %indvar.next, %bb ] ; <i32> [#uses=2]
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%t.063.0 = phi i32 [ 0, %entry ], [ %tmp47, %bb ] ; <i32> [#uses=1]
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%j.065.0 = shl i32 %indvar, 2 ; <i32> [#uses=4]
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%tmp3 = getelementptr [0 x i32]* @state, i32 0, i32 %j.065.0 ; <i32*> [#uses=2]
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%tmp4 = load i32* %tmp3, align 4 ; <i32> [#uses=1]
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%tmp6 = getelementptr [0 x i32]* @S, i32 0, i32 %t.063.0 ; <i32*> [#uses=1]
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%tmp7 = load i32* %tmp6, align 4 ; <i32> [#uses=1]
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%tmp8 = xor i32 %tmp7, %tmp4 ; <i32> [#uses=2]
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store i32 %tmp8, i32* %tmp3, align 4
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%tmp1378 = or i32 %j.065.0, 1 ; <i32> [#uses=1]
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%tmp16 = getelementptr [0 x i32]* @state, i32 0, i32 %tmp1378 ; <i32*> [#uses=2]
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%tmp17 = load i32* %tmp16, align 4 ; <i32> [#uses=1]
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%tmp19 = getelementptr [0 x i32]* @S, i32 0, i32 %tmp8 ; <i32*> [#uses=1]
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%tmp20 = load i32* %tmp19, align 4 ; <i32> [#uses=1]
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%tmp21 = xor i32 %tmp20, %tmp17 ; <i32> [#uses=2]
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store i32 %tmp21, i32* %tmp16, align 4
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%tmp2680 = or i32 %j.065.0, 2 ; <i32> [#uses=1]
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%tmp29 = getelementptr [0 x i32]* @state, i32 0, i32 %tmp2680 ; <i32*> [#uses=2]
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%tmp30 = load i32* %tmp29, align 4 ; <i32> [#uses=1]
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%tmp32 = getelementptr [0 x i32]* @S, i32 0, i32 %tmp21 ; <i32*> [#uses=1]
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%tmp33 = load i32* %tmp32, align 4 ; <i32> [#uses=1]
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%tmp34 = xor i32 %tmp33, %tmp30 ; <i32> [#uses=2]
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store i32 %tmp34, i32* %tmp29, align 4
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%tmp3982 = or i32 %j.065.0, 3 ; <i32> [#uses=1]
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%tmp42 = getelementptr [0 x i32]* @state, i32 0, i32 %tmp3982 ; <i32*> [#uses=2]
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%tmp43 = load i32* %tmp42, align 4 ; <i32> [#uses=1]
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%tmp45 = getelementptr [0 x i32]* @S, i32 0, i32 %tmp34 ; <i32*> [#uses=1]
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%tmp46 = load i32* %tmp45, align 4 ; <i32> [#uses=1]
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%tmp47 = xor i32 %tmp46, %tmp43 ; <i32> [#uses=3]
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store i32 %tmp47, i32* %tmp42, align 4
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%indvar.next = add i32 %indvar, 1 ; <i32> [#uses=2]
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%exitcond = icmp eq i32 %indvar.next, 4 ; <i1> [#uses=1]
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br i1 %exitcond, label %bb57, label %bb
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bb57: ; preds = %bb
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%tmp59 = and i32 %tmp47, 255 ; <i32> [#uses=1]
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ret i32 %tmp59
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}
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