; NOTE: Assertions have been autogenerated by utils/update_test_checks.py ; RUN: opt < %s -passes=reassociate -S | FileCheck %s ; Test that we can turn things like X*-(Y*Z) -> X*-1*Y*Z. define i32 @test1(i32 %a, i32 %b, i32 %z) { ; CHECK-LABEL: @test1( ; CHECK-NEXT: [[E:%.*]] = mul i32 [[A:%.*]], 12345 ; CHECK-NEXT: [[F:%.*]] = mul i32 [[E]], [[B:%.*]] ; CHECK-NEXT: [[G:%.*]] = mul i32 [[F]], [[Z:%.*]] ; CHECK-NEXT: ret i32 [[G]] ; %c = sub i32 0, %z %d = mul i32 %a, %b %e = mul i32 %c, %d %f = mul i32 %e, 12345 %g = sub i32 0, %f ret i32 %g } define i32 @test2(i32 %a, i32 %b, i32 %z) { ; CHECK-LABEL: @test2( ; CHECK-NEXT: [[E:%.*]] = mul i32 [[A:%.*]], 40 ; CHECK-NEXT: [[F:%.*]] = mul i32 [[E]], [[Z:%.*]] ; CHECK-NEXT: ret i32 [[F]] ; %d = mul i32 %z, 40 %c = sub i32 0, %d %e = mul i32 %a, %c %f = sub i32 0, %e ret i32 %f } define <2 x i32> @negate_vec_undefs(<2 x i32> %a, <2 x i32> %b, <2 x i32> %z) { ; CHECK-LABEL: @negate_vec_undefs( ; CHECK-NEXT: [[E:%.*]] = mul <2 x i32> [[A:%.*]], ; CHECK-NEXT: [[F:%.*]] = mul <2 x i32> [[E]], [[Z:%.*]] ; CHECK-NEXT: ret <2 x i32> [[F]] ; %d = mul <2 x i32> %z, %c = sub <2 x i32> , %d %e = mul <2 x i32> %a, %c %f = sub <2 x i32> , %e ret <2 x i32> %f } ; Replacing %x with a partial undef negation is a miscompile. define <2 x i32> @PR57683(<2 x i32> %x) { ; CHECK-LABEL: @PR57683( ; CHECK-NEXT: [[PARTIAL_NEG:%.*]] = sub <2 x i32> , [[X:%.*]] ; CHECK-NEXT: [[SHUF:%.*]] = shufflevector <2 x i32> [[PARTIAL_NEG]], <2 x i32> [[X]], <2 x i32> ; CHECK-NEXT: [[X_NEG:%.*]] = sub <2 x i32> zeroinitializer, [[X]] ; CHECK-NEXT: [[SUB:%.*]] = add <2 x i32> [[X_NEG]], ; CHECK-NEXT: [[R:%.*]] = add <2 x i32> [[SUB]], [[SHUF]] ; CHECK-NEXT: ret <2 x i32> [[R]] ; %partial_neg = sub <2 x i32> , %x %shuf = shufflevector <2 x i32> %partial_neg, <2 x i32> %x, <2 x i32> %sub = sub <2 x i32> , %x %r = add <2 x i32> %sub, %shuf ret <2 x i32> %r } define <2 x float> @PR57683_FP(<2 x float> %x) { ; CHECK-LABEL: @PR57683_FP( ; CHECK-NEXT: [[PARTIAL_NEG:%.*]] = fsub reassoc nsz <2 x float> , [[X:%.*]] ; CHECK-NEXT: [[SHUF:%.*]] = shufflevector <2 x float> [[PARTIAL_NEG]], <2 x float> [[X]], <2 x i32> ; CHECK-NEXT: [[X_NEG:%.*]] = fneg reassoc nsz <2 x float> [[X]] ; CHECK-NEXT: [[SUB:%.*]] = fadd reassoc nsz <2 x float> [[X_NEG]], ; CHECK-NEXT: [[R:%.*]] = fadd reassoc nsz <2 x float> [[SUB]], [[SHUF]] ; CHECK-NEXT: ret <2 x float> [[R]] ; %partial_neg = fsub reassoc nsz <2 x float> , %x %shuf = shufflevector <2 x float> %partial_neg, <2 x float> %x, <2 x i32> %sub = fsub reassoc nsz <2 x float> , %x %r = fadd reassoc nsz <2 x float> %sub, %shuf ret <2 x float> %r }