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4d5ef8fb85
We sometimes create intermediate subtract instructions during reassociation. Adding these to the worklist to revisit exposes many additional reassociation opportunities. Patch by Aditya Nandakumar. llvm-svn: 253240
31 lines
875 B
LLVM
31 lines
875 B
LLVM
; RUN: opt < %s -reassociate -S | FileCheck %s
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define i64 @multistep1(i64 %a, i64 %b, i64 %c) {
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; Check that a*a*b+a*a*c is turned into a*(a*(b+c)).
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; CHECK-LABEL: @multistep1(
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%t0 = mul i64 %a, %b
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%t1 = mul i64 %a, %t0 ; a*(a*b)
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%t2 = mul i64 %a, %c
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%t3 = mul i64 %a, %t2 ; a*(a*c)
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%t4 = add i64 %t1, %t3
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; CHECK-NEXT: [[TMP1:%tmp.*]] = add i64 %c, %b
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; CHECK-NEXT: [[TMP2:%tmp.*]] = mul i64 %a, %a
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; CHECK-NEXT: mul i64 [[TMP2]], [[TMP1]]
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; CHECK-NEXT: ret
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ret i64 %t4
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}
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define i64 @multistep2(i64 %a, i64 %b, i64 %c, i64 %d) {
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; Check that a*b+a*c+d is turned into a*(b+c)+d.
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; CHECK-LABEL: @multistep2(
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%t0 = mul i64 %a, %b
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%t1 = mul i64 %a, %c
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%t2 = add i64 %t1, %d ; a*c+d
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%t3 = add i64 %t0, %t2 ; a*b+(a*c+d)
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; CHECK-NEXT: add i64 %c, %b
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; CHECK-NEXT: mul i64 %tmp{{.*}}, %a
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; CHECK-NEXT: add i64 %tmp{{.*}}, %d
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; CHECK-NEXT: ret
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ret i64 %t3
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}
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