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Fix the folding of multiplication into addresses on x86, which was broken
by the recent {U,S}MUL_LOHI changes. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@43230 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -681,6 +681,11 @@ bool X86DAGToDAGISel::MatchAddress(SDOperand N, X86ISelAddressMode &AM,
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}
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break;
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case ISD::SMUL_LOHI:
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case ISD::UMUL_LOHI:
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// A mul_lohi where we need the low part can be folded as a plain multiply.
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if (N.ResNo != 0) break;
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// FALL THROUGH
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case ISD::MUL:
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// X*[3,5,9] -> X+X*[2,4,8]
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if (!Available &&
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30
test/CodeGen/X86/fold-mul-lohi.ll
Normal file
30
test/CodeGen/X86/fold-mul-lohi.ll
Normal file
@ -0,0 +1,30 @@
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; RUN: llvm-as < %s | llc -march=x86 | not grep lea
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; RUN: llvm-as < %s | llc -march=x86-64 | not grep lea
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@B = external global [1000 x i8], align 32
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@A = external global [1000 x i8], align 32
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@P = external global [1000 x i8], align 32
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define void @foo(i32 %m) {
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entry:
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%tmp1 = icmp sgt i32 %m, 0
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br i1 %tmp1, label %bb, label %return
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bb:
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%i.019.0 = phi i32 [ %indvar.next, %bb ], [ 0, %entry ]
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%tmp2 = getelementptr [1000 x i8]* @B, i32 0, i32 %i.019.0
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%tmp3 = load i8* %tmp2, align 4
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%tmp4 = mul i8 %tmp3, 2
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%tmp5 = getelementptr [1000 x i8]* @A, i32 0, i32 %i.019.0
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store i8 %tmp4, i8* %tmp5, align 4
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%tmp8 = mul i32 %i.019.0, 9
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%tmp10 = getelementptr [1000 x i8]* @P, i32 0, i32 %tmp8
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store i8 17, i8* %tmp10, align 4
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%indvar.next = add i32 %i.019.0, 1
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%exitcond = icmp eq i32 %indvar.next, %m
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br i1 %exitcond, label %return, label %bb
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return:
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ret void
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}
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