; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py ; RUN: llc -mtriple=aarch64-gnu-linux -mcpu=neoverse-n2 < %s | FileCheck %s --check-prefixes=CHECK,CHECK-STD ; RUN: llc -mtriple=aarch64-gnu-linux -mcpu=neoverse-n2 -enable-unsafe-fp-math < %s | FileCheck %s --check-prefixes=CHECK,CHECK-UNSAFE ; Incremental updates of the instruction depths should be enough for this test ; case. ; RUN: llc -mtriple=aarch64-gnu-linux -mcpu=neoverse-n2 -enable-unsafe-fp-math \ ; RUN: -machine-combiner-inc-threshold=0 -machine-combiner-verify-pattern-order=true < %s | FileCheck %s --check-prefixes=CHECK,CHECK-UNSAFE ; Verify that the first two adds are independent regardless of how the inputs are ; commuted. The destination registers are used as source registers for the third add. define float @reassociate_adds1(float %x0, float %x1, float %x2, float %x3) { ; CHECK-STD-LABEL: reassociate_adds1: ; CHECK-STD: // %bb.0: ; CHECK-STD-NEXT: fadd s0, s0, s1 ; CHECK-STD-NEXT: fadd s0, s0, s2 ; CHECK-STD-NEXT: fadd s0, s0, s3 ; CHECK-STD-NEXT: ret ; ; CHECK-UNSAFE-LABEL: reassociate_adds1: ; CHECK-UNSAFE: // %bb.0: ; CHECK-UNSAFE-NEXT: fadd s0, s0, s1 ; CHECK-UNSAFE-NEXT: fadd s1, s2, s3 ; CHECK-UNSAFE-NEXT: fadd s0, s0, s1 ; CHECK-UNSAFE-NEXT: ret %t0 = fadd float %x0, %x1 %t1 = fadd float %t0, %x2 %t2 = fadd float %t1, %x3 ret float %t2 } define float @reassociate_adds1_fast(float %x0, float %x1, float %x2, float %x3) { ; CHECK-LABEL: reassociate_adds1_fast: ; CHECK: // %bb.0: ; CHECK-NEXT: fadd s0, s0, s1 ; CHECK-NEXT: fadd s1, s2, s3 ; CHECK-NEXT: fadd s0, s0, s1 ; CHECK-NEXT: ret %t0 = fadd fast float %x0, %x1 %t1 = fadd fast float %t0, %x2 %t2 = fadd fast float %t1, %x3 ret float %t2 } define float @reassociate_adds1_reassoc(float %x0, float %x1, float %x2, float %x3) { ; CHECK-STD-LABEL: reassociate_adds1_reassoc: ; CHECK-STD: // %bb.0: ; CHECK-STD-NEXT: fadd s0, s0, s1 ; CHECK-STD-NEXT: fadd s0, s0, s2 ; CHECK-STD-NEXT: fadd s0, s0, s3 ; CHECK-STD-NEXT: ret ; ; CHECK-UNSAFE-LABEL: reassociate_adds1_reassoc: ; CHECK-UNSAFE: // %bb.0: ; CHECK-UNSAFE-NEXT: fadd s0, s0, s1 ; CHECK-UNSAFE-NEXT: fadd s1, s2, s3 ; CHECK-UNSAFE-NEXT: fadd s0, s0, s1 ; CHECK-UNSAFE-NEXT: ret %t0 = fadd reassoc float %x0, %x1 %t1 = fadd reassoc float %t0, %x2 %t2 = fadd reassoc float %t1, %x3 ret float %t2 } define float @reassociate_adds2(float %x0, float %x1, float %x2, float %x3) { ; CHECK-STD-LABEL: reassociate_adds2: ; CHECK-STD: // %bb.0: ; CHECK-STD-NEXT: fadd s0, s0, s1 ; CHECK-STD-NEXT: fadd s0, s2, s0 ; CHECK-STD-NEXT: fadd s0, s0, s3 ; CHECK-STD-NEXT: ret ; ; CHECK-UNSAFE-LABEL: reassociate_adds2: ; CHECK-UNSAFE: // %bb.0: ; CHECK-UNSAFE-NEXT: fadd s0, s0, s1 ; CHECK-UNSAFE-NEXT: fadd s1, s2, s3 ; CHECK-UNSAFE-NEXT: fadd s0, s1, s0 ; CHECK-UNSAFE-NEXT: ret %t0 = fadd float %x0, %x1 %t1 = fadd float %x2, %t0 %t2 = fadd float %t1, %x3 ret float %t2 } define float @reassociate_adds3(float %x0, float %x1, float %x2, float %x3) { ; CHECK-STD-LABEL: reassociate_adds3: ; CHECK-STD: // %bb.0: ; CHECK-STD-NEXT: fadd s0, s0, s1 ; CHECK-STD-NEXT: fadd s0, s0, s2 ; CHECK-STD-NEXT: fadd s0, s3, s0 ; CHECK-STD-NEXT: ret ; ; CHECK-UNSAFE-LABEL: reassociate_adds3: ; CHECK-UNSAFE: // %bb.0: ; CHECK-UNSAFE-NEXT: fadd s0, s0, s1 ; CHECK-UNSAFE-NEXT: fadd s1, s3, s2 ; CHECK-UNSAFE-NEXT: fadd s0, s1, s0 ; CHECK-UNSAFE-NEXT: ret %t0 = fadd float %x0, %x1 %t1 = fadd float %t0, %x2 %t2 = fadd float %x3, %t1 ret float %t2 } define float @reassociate_adds4(float %x0, float %x1, float %x2, float %x3) { ; CHECK-STD-LABEL: reassociate_adds4: ; CHECK-STD: // %bb.0: ; CHECK-STD-NEXT: fadd s0, s0, s1 ; CHECK-STD-NEXT: fadd s0, s2, s0 ; CHECK-STD-NEXT: fadd s0, s3, s0 ; CHECK-STD-NEXT: ret ; ; CHECK-UNSAFE-LABEL: reassociate_adds4: ; CHECK-UNSAFE: // %bb.0: ; CHECK-UNSAFE-NEXT: fadd s0, s0, s1 ; CHECK-UNSAFE-NEXT: fadd s1, s3, s2 ; CHECK-UNSAFE-NEXT: fadd s0, s1, s0 ; CHECK-UNSAFE-NEXT: ret %t0 = fadd float %x0, %x1 %t1 = fadd float %x2, %t0 %t2 = fadd float %x3, %t1 ret float %t2 } ; Verify that we reassociate some of these ops. The optimal balanced tree of adds is not ; produced because that would cost more compile time. define float @reassociate_adds5(float %x0, float %x1, float %x2, float %x3, float %x4, float %x5, float %x6, float %x7) { ; CHECK-STD-LABEL: reassociate_adds5: ; CHECK-STD: // %bb.0: ; CHECK-STD-NEXT: fadd s0, s0, s1 ; CHECK-STD-NEXT: fadd s0, s0, s2 ; CHECK-STD-NEXT: fadd s0, s0, s3 ; CHECK-STD-NEXT: fadd s0, s0, s4 ; CHECK-STD-NEXT: fadd s0, s0, s5 ; CHECK-STD-NEXT: fadd s0, s0, s6 ; CHECK-STD-NEXT: fadd s0, s0, s7 ; CHECK-STD-NEXT: ret ; ; CHECK-UNSAFE-LABEL: reassociate_adds5: ; CHECK-UNSAFE: // %bb.0: ; CHECK-UNSAFE-NEXT: fadd s0, s0, s1 ; CHECK-UNSAFE-NEXT: fadd s1, s2, s3 ; CHECK-UNSAFE-NEXT: fadd s0, s0, s1 ; CHECK-UNSAFE-NEXT: fadd s1, s4, s5 ; CHECK-UNSAFE-NEXT: fadd s1, s1, s6 ; CHECK-UNSAFE-NEXT: fadd s0, s0, s1 ; CHECK-UNSAFE-NEXT: fadd s0, s0, s7 ; CHECK-UNSAFE-NEXT: ret %t0 = fadd float %x0, %x1 %t1 = fadd float %t0, %x2 %t2 = fadd float %t1, %x3 %t3 = fadd float %t2, %x4 %t4 = fadd float %t3, %x5 %t5 = fadd float %t4, %x6 %t6 = fadd float %t5, %x7 ret float %t6 } ; Verify that we only need two associative operations to reassociate the operands. ; Also, we should reassociate such that the result of the high latency division ; is used by the final 'add' rather than reassociating the %x3 operand with the ; division. The latter reassociation would not improve anything. define float @reassociate_adds6(float %x0, float %x1, float %x2, float %x3) { ; CHECK-STD-LABEL: reassociate_adds6: ; CHECK-STD: // %bb.0: ; CHECK-STD-NEXT: fdiv s0, s0, s1 ; CHECK-STD-NEXT: fadd s0, s2, s0 ; CHECK-STD-NEXT: fadd s0, s3, s0 ; CHECK-STD-NEXT: ret ; ; CHECK-UNSAFE-LABEL: reassociate_adds6: ; CHECK-UNSAFE: // %bb.0: ; CHECK-UNSAFE-NEXT: fdiv s0, s0, s1 ; CHECK-UNSAFE-NEXT: fadd s1, s3, s2 ; CHECK-UNSAFE-NEXT: fadd s0, s1, s0 ; CHECK-UNSAFE-NEXT: ret %t0 = fdiv float %x0, %x1 %t1 = fadd float %x2, %t0 %t2 = fadd float %x3, %t1 ret float %t2 } ; Verify that scalar single-precision multiplies are reassociated. define float @reassociate_muls1(float %x0, float %x1, float %x2, float %x3) { ; CHECK-STD-LABEL: reassociate_muls1: ; CHECK-STD: // %bb.0: ; CHECK-STD-NEXT: fdiv s0, s0, s1 ; CHECK-STD-NEXT: fmul s0, s2, s0 ; CHECK-STD-NEXT: fmul s0, s3, s0 ; CHECK-STD-NEXT: ret ; ; CHECK-UNSAFE-LABEL: reassociate_muls1: ; CHECK-UNSAFE: // %bb.0: ; CHECK-UNSAFE-NEXT: fdiv s0, s0, s1 ; CHECK-UNSAFE-NEXT: fmul s1, s3, s2 ; CHECK-UNSAFE-NEXT: fmul s0, s1, s0 ; CHECK-UNSAFE-NEXT: ret %t0 = fdiv float %x0, %x1 %t1 = fmul float %x2, %t0 %t2 = fmul float %x3, %t1 ret float %t2 } ; Verify that scalar double-precision adds are reassociated. define double @reassociate_adds_double(double %x0, double %x1, double %x2, double %x3) { ; CHECK-STD-LABEL: reassociate_adds_double: ; CHECK-STD: // %bb.0: ; CHECK-STD-NEXT: fdiv d0, d0, d1 ; CHECK-STD-NEXT: fadd d0, d2, d0 ; CHECK-STD-NEXT: fadd d0, d3, d0 ; CHECK-STD-NEXT: ret ; ; CHECK-UNSAFE-LABEL: reassociate_adds_double: ; CHECK-UNSAFE: // %bb.0: ; CHECK-UNSAFE-NEXT: fdiv d0, d0, d1 ; CHECK-UNSAFE-NEXT: fadd d1, d3, d2 ; CHECK-UNSAFE-NEXT: fadd d0, d1, d0 ; CHECK-UNSAFE-NEXT: ret %t0 = fdiv double %x0, %x1 %t1 = fadd double %x2, %t0 %t2 = fadd double %x3, %t1 ret double %t2 } ; Verify that scalar double-precision multiplies are reassociated. define double @reassociate_muls_double(double %x0, double %x1, double %x2, double %x3) { ; CHECK-STD-LABEL: reassociate_muls_double: ; CHECK-STD: // %bb.0: ; CHECK-STD-NEXT: fdiv d0, d0, d1 ; CHECK-STD-NEXT: fmul d0, d2, d0 ; CHECK-STD-NEXT: fmul d0, d3, d0 ; CHECK-STD-NEXT: ret ; ; CHECK-UNSAFE-LABEL: reassociate_muls_double: ; CHECK-UNSAFE: // %bb.0: ; CHECK-UNSAFE-NEXT: fdiv d0, d0, d1 ; CHECK-UNSAFE-NEXT: fmul d1, d3, d2 ; CHECK-UNSAFE-NEXT: fmul d0, d1, d0 ; CHECK-UNSAFE-NEXT: ret %t0 = fdiv double %x0, %x1 %t1 = fmul double %x2, %t0 %t2 = fmul double %x3, %t1 ret double %t2 } ; Verify that scalar half-precision adds are reassociated. define half @reassociate_adds_half(half %x0, half %x1, half %x2, half %x3) { ; CHECK-STD-LABEL: reassociate_adds_half: ; CHECK-STD: // %bb.0: ; CHECK-STD-NEXT: fdiv h0, h0, h1 ; CHECK-STD-NEXT: fadd h0, h2, h0 ; CHECK-STD-NEXT: fadd h0, h3, h0 ; CHECK-STD-NEXT: ret ; ; CHECK-UNSAFE-LABEL: reassociate_adds_half: ; CHECK-UNSAFE: // %bb.0: ; CHECK-UNSAFE-NEXT: fdiv h0, h0, h1 ; CHECK-UNSAFE-NEXT: fadd h1, h3, h2 ; CHECK-UNSAFE-NEXT: fadd h0, h1, h0 ; CHECK-UNSAFE-NEXT: ret %t0 = fdiv half %x0, %x1 %t1 = fadd half %x2, %t0 %t2 = fadd half %x3, %t1 ret half %t2 } ; Verify that scalar half-precision multiplies are reassociated. define half @reassociate_muls_half(half %x0, half %x1, half %x2, half %x3) { ; CHECK-STD-LABEL: reassociate_muls_half: ; CHECK-STD: // %bb.0: ; CHECK-STD-NEXT: fdiv h0, h0, h1 ; CHECK-STD-NEXT: fmul h0, h2, h0 ; CHECK-STD-NEXT: fmul h0, h3, h0 ; CHECK-STD-NEXT: ret ; ; CHECK-UNSAFE-LABEL: reassociate_muls_half: ; CHECK-UNSAFE: // %bb.0: ; CHECK-UNSAFE-NEXT: fdiv h0, h0, h1 ; CHECK-UNSAFE-NEXT: fmul h1, h3, h2 ; CHECK-UNSAFE-NEXT: fmul h0, h1, h0 ; CHECK-UNSAFE-NEXT: ret %t0 = fdiv half %x0, %x1 %t1 = fmul half %x2, %t0 %t2 = fmul half %x3, %t1 ret half %t2 } ; Verify that scalar integer adds are reassociated. define i32 @reassociate_adds_i32(i32 %x0, i32 %x1, i32 %x2, i32 %x3) { ; CHECK-LABEL: reassociate_adds_i32: ; CHECK: // %bb.0: ; CHECK-NEXT: udiv w8, w0, w1 ; CHECK-NEXT: add w9, w3, w2 ; CHECK-NEXT: add w0, w9, w8 ; CHECK-NEXT: ret %t0 = udiv i32 %x0, %x1 %t1 = add i32 %x2, %t0 %t2 = add i32 %x3, %t1 ret i32 %t2 } define i64 @reassociate_adds_i64(i64 %x0, i64 %x1, i64 %x2, i64 %x3) { ; CHECK-LABEL: reassociate_adds_i64: ; CHECK: // %bb.0: ; CHECK-NEXT: udiv x8, x0, x1 ; CHECK-NEXT: add x9, x3, x2 ; CHECK-NEXT: add x0, x9, x8 ; CHECK-NEXT: ret %t0 = udiv i64 %x0, %x1 %t1 = add i64 %x2, %t0 %t2 = add i64 %x3, %t1 ret i64 %t2 } ; Verify that scalar bitwise operations are reassociated. define i32 @reassociate_ands_i32(i32 %x0, i32 %x1, i32 %x2, i32 %x3) { ; CHECK-LABEL: reassociate_ands_i32: ; CHECK: // %bb.0: ; CHECK-NEXT: and w8, w0, w1 ; CHECK-NEXT: and w9, w2, w3 ; CHECK-NEXT: and w0, w8, w9 ; CHECK-NEXT: ret %t0 = and i32 %x0, %x1 %t1 = and i32 %t0, %x2 %t2 = and i32 %t1, %x3 ret i32 %t2 } define i64 @reassociate_ors_i64(i64 %x0, i64 %x1, i64 %x2, i64 %x3) { ; CHECK-LABEL: reassociate_ors_i64: ; CHECK: // %bb.0: ; CHECK-NEXT: orr x8, x0, x1 ; CHECK-NEXT: orr x9, x2, x3 ; CHECK-NEXT: orr x0, x8, x9 ; CHECK-NEXT: ret %t0 = or i64 %x0, %x1 %t1 = or i64 %t0, %x2 %t2 = or i64 %t1, %x3 ret i64 %t2 } define i32 @reassociate_xors_i32(i32 %x0, i32 %x1, i32 %x2, i32 %x3) { ; CHECK-LABEL: reassociate_xors_i32: ; CHECK: // %bb.0: ; CHECK-NEXT: eor w8, w0, w1 ; CHECK-NEXT: eor w9, w2, w3 ; CHECK-NEXT: eor w0, w8, w9 ; CHECK-NEXT: ret %t0 = xor i32 %x0, %x1 %t1 = xor i32 %t0, %x2 %t2 = xor i32 %t1, %x3 ret i32 %t2 } ; Verify that we reassociate vector instructions too. define <4 x float> @vector_reassociate_adds1(<4 x float> %x0, <4 x float> %x1, <4 x float> %x2, <4 x float> %x3) { ; CHECK-STD-LABEL: vector_reassociate_adds1: ; CHECK-STD: // %bb.0: ; CHECK-STD-NEXT: fadd v0.4s, v0.4s, v1.4s ; CHECK-STD-NEXT: fadd v0.4s, v0.4s, v2.4s ; CHECK-STD-NEXT: fadd v0.4s, v0.4s, v3.4s ; CHECK-STD-NEXT: ret ; ; CHECK-UNSAFE-LABEL: vector_reassociate_adds1: ; CHECK-UNSAFE: // %bb.0: ; CHECK-UNSAFE-NEXT: fadd v0.4s, v0.4s, v1.4s ; CHECK-UNSAFE-NEXT: fadd v1.4s, v2.4s, v3.4s ; CHECK-UNSAFE-NEXT: fadd v0.4s, v0.4s, v1.4s ; CHECK-UNSAFE-NEXT: ret %t0 = fadd <4 x float> %x0, %x1 %t1 = fadd <4 x float> %t0, %x2 %t2 = fadd <4 x float> %t1, %x3 ret <4 x float> %t2 } define <4 x float> @vector_reassociate_adds2(<4 x float> %x0, <4 x float> %x1, <4 x float> %x2, <4 x float> %x3) { ; CHECK-STD-LABEL: vector_reassociate_adds2: ; CHECK-STD: // %bb.0: ; CHECK-STD-NEXT: fadd v0.4s, v0.4s, v1.4s ; CHECK-STD-NEXT: fadd v0.4s, v2.4s, v0.4s ; CHECK-STD-NEXT: fadd v0.4s, v0.4s, v3.4s ; CHECK-STD-NEXT: ret ; ; CHECK-UNSAFE-LABEL: vector_reassociate_adds2: ; CHECK-UNSAFE: // %bb.0: ; CHECK-UNSAFE-NEXT: fadd v0.4s, v0.4s, v1.4s ; CHECK-UNSAFE-NEXT: fadd v1.4s, v2.4s, v3.4s ; CHECK-UNSAFE-NEXT: fadd v0.4s, v1.4s, v0.4s ; CHECK-UNSAFE-NEXT: ret %t0 = fadd <4 x float> %x0, %x1 %t1 = fadd <4 x float> %x2, %t0 %t2 = fadd <4 x float> %t1, %x3 ret <4 x float> %t2 } define <4 x float> @vector_reassociate_adds3(<4 x float> %x0, <4 x float> %x1, <4 x float> %x2, <4 x float> %x3) { ; CHECK-STD-LABEL: vector_reassociate_adds3: ; CHECK-STD: // %bb.0: ; CHECK-STD-NEXT: fadd v0.4s, v0.4s, v1.4s ; CHECK-STD-NEXT: fadd v0.4s, v0.4s, v2.4s ; CHECK-STD-NEXT: fadd v0.4s, v3.4s, v0.4s ; CHECK-STD-NEXT: ret ; ; CHECK-UNSAFE-LABEL: vector_reassociate_adds3: ; CHECK-UNSAFE: // %bb.0: ; CHECK-UNSAFE-NEXT: fadd v0.4s, v0.4s, v1.4s ; CHECK-UNSAFE-NEXT: fadd v1.4s, v3.4s, v2.4s ; CHECK-UNSAFE-NEXT: fadd v0.4s, v1.4s, v0.4s ; CHECK-UNSAFE-NEXT: ret %t0 = fadd <4 x float> %x0, %x1 %t1 = fadd <4 x float> %t0, %x2 %t2 = fadd <4 x float> %x3, %t1 ret <4 x float> %t2 } define <4 x float> @vector_reassociate_adds4(<4 x float> %x0, <4 x float> %x1, <4 x float> %x2, <4 x float> %x3) { ; CHECK-STD-LABEL: vector_reassociate_adds4: ; CHECK-STD: // %bb.0: ; CHECK-STD-NEXT: fadd v0.4s, v0.4s, v1.4s ; CHECK-STD-NEXT: fadd v0.4s, v2.4s, v0.4s ; CHECK-STD-NEXT: fadd v0.4s, v3.4s, v0.4s ; CHECK-STD-NEXT: ret ; ; CHECK-UNSAFE-LABEL: vector_reassociate_adds4: ; CHECK-UNSAFE: // %bb.0: ; CHECK-UNSAFE-NEXT: fadd v0.4s, v0.4s, v1.4s ; CHECK-UNSAFE-NEXT: fadd v1.4s, v3.4s, v2.4s ; CHECK-UNSAFE-NEXT: fadd v0.4s, v1.4s, v0.4s ; CHECK-UNSAFE-NEXT: ret %t0 = fadd <4 x float> %x0, %x1 %t1 = fadd <4 x float> %x2, %t0 %t2 = fadd <4 x float> %x3, %t1 ret <4 x float> %t2 } ; Verify that 64-bit vector half-precision adds are reassociated. define <4 x half> @reassociate_adds_v4f16(<4 x half> %x0, <4 x half> %x1, <4 x half> %x2, <4 x half> %x3) { ; CHECK-STD-LABEL: reassociate_adds_v4f16: ; CHECK-STD: // %bb.0: ; CHECK-STD-NEXT: fadd v0.4h, v0.4h, v1.4h ; CHECK-STD-NEXT: fadd v0.4h, v2.4h, v0.4h ; CHECK-STD-NEXT: fadd v0.4h, v3.4h, v0.4h ; CHECK-STD-NEXT: ret ; ; CHECK-UNSAFE-LABEL: reassociate_adds_v4f16: ; CHECK-UNSAFE: // %bb.0: ; CHECK-UNSAFE-NEXT: fadd v0.4h, v0.4h, v1.4h ; CHECK-UNSAFE-NEXT: fadd v1.4h, v3.4h, v2.4h ; CHECK-UNSAFE-NEXT: fadd v0.4h, v1.4h, v0.4h ; CHECK-UNSAFE-NEXT: ret %t0 = fadd <4 x half> %x0, %x1 %t1 = fadd <4 x half> %x2, %t0 %t2 = fadd <4 x half> %x3, %t1 ret <4 x half> %t2 } ; Verify that 128-bit vector half-precision multiplies are reassociated. define <8 x half> @reassociate_muls_v8f16(<8 x half> %x0, <8 x half> %x1, <8 x half> %x2, <8 x half> %x3) { ; CHECK-STD-LABEL: reassociate_muls_v8f16: ; CHECK-STD: // %bb.0: ; CHECK-STD-NEXT: fadd v0.8h, v0.8h, v1.8h ; CHECK-STD-NEXT: fmul v0.8h, v2.8h, v0.8h ; CHECK-STD-NEXT: fmul v0.8h, v3.8h, v0.8h ; CHECK-STD-NEXT: ret ; ; CHECK-UNSAFE-LABEL: reassociate_muls_v8f16: ; CHECK-UNSAFE: // %bb.0: ; CHECK-UNSAFE-NEXT: fadd v0.8h, v0.8h, v1.8h ; CHECK-UNSAFE-NEXT: fmul v1.8h, v3.8h, v2.8h ; CHECK-UNSAFE-NEXT: fmul v0.8h, v1.8h, v0.8h ; CHECK-UNSAFE-NEXT: ret %t0 = fadd <8 x half> %x0, %x1 %t1 = fmul <8 x half> %x2, %t0 %t2 = fmul <8 x half> %x3, %t1 ret <8 x half> %t2 } ; Verify that 128-bit vector single-precision multiplies are reassociated. define <4 x float> @reassociate_muls_v4f32(<4 x float> %x0, <4 x float> %x1, <4 x float> %x2, <4 x float> %x3) { ; CHECK-STD-LABEL: reassociate_muls_v4f32: ; CHECK-STD: // %bb.0: ; CHECK-STD-NEXT: fadd v0.4s, v0.4s, v1.4s ; CHECK-STD-NEXT: fmul v0.4s, v2.4s, v0.4s ; CHECK-STD-NEXT: fmul v0.4s, v3.4s, v0.4s ; CHECK-STD-NEXT: ret ; ; CHECK-UNSAFE-LABEL: reassociate_muls_v4f32: ; CHECK-UNSAFE: // %bb.0: ; CHECK-UNSAFE-NEXT: fadd v0.4s, v0.4s, v1.4s ; CHECK-UNSAFE-NEXT: fmul v1.4s, v3.4s, v2.4s ; CHECK-UNSAFE-NEXT: fmul v0.4s, v1.4s, v0.4s ; CHECK-UNSAFE-NEXT: ret %t0 = fadd <4 x float> %x0, %x1 %t1 = fmul <4 x float> %x2, %t0 %t2 = fmul <4 x float> %x3, %t1 ret <4 x float> %t2 } ; Verify that 128-bit vector double-precision multiplies are reassociated. define <2 x double> @reassociate_muls_v2f64(<2 x double> %x0, <2 x double> %x1, <2 x double> %x2, <2 x double> %x3) { ; CHECK-STD-LABEL: reassociate_muls_v2f64: ; CHECK-STD: // %bb.0: ; CHECK-STD-NEXT: fadd v0.2d, v0.2d, v1.2d ; CHECK-STD-NEXT: fmul v0.2d, v2.2d, v0.2d ; CHECK-STD-NEXT: fmul v0.2d, v3.2d, v0.2d ; CHECK-STD-NEXT: ret ; ; CHECK-UNSAFE-LABEL: reassociate_muls_v2f64: ; CHECK-UNSAFE: // %bb.0: ; CHECK-UNSAFE-NEXT: fadd v0.2d, v0.2d, v1.2d ; CHECK-UNSAFE-NEXT: fmul v1.2d, v3.2d, v2.2d ; CHECK-UNSAFE-NEXT: fmul v0.2d, v1.2d, v0.2d ; CHECK-UNSAFE-NEXT: ret %t0 = fadd <2 x double> %x0, %x1 %t1 = fmul <2 x double> %x2, %t0 %t2 = fmul <2 x double> %x3, %t1 ret <2 x double> %t2 } ; Verify that vector integer arithmetic operations are reassociated. define <2 x i32> @reassociate_muls_v2i32(<2 x i32> %x0, <2 x i32> %x1, <2 x i32> %x2, <2 x i32> %x3) { ; CHECK-LABEL: reassociate_muls_v2i32: ; CHECK: // %bb.0: ; CHECK-NEXT: mul v0.2s, v0.2s, v1.2s ; CHECK-NEXT: mul v1.2s, v3.2s, v2.2s ; CHECK-NEXT: mul v0.2s, v1.2s, v0.2s ; CHECK-NEXT: ret %t0 = mul <2 x i32> %x0, %x1 %t1 = mul <2 x i32> %x2, %t0 %t2 = mul <2 x i32> %x3, %t1 ret <2 x i32> %t2 } define <2 x i64> @reassociate_adds_v2i64(<2 x i64> %x0, <2 x i64> %x1, <2 x i64> %x2, <2 x i64> %x3) { ; CHECK-LABEL: reassociate_adds_v2i64: ; CHECK: // %bb.0: ; CHECK-NEXT: add v0.2d, v0.2d, v1.2d ; CHECK-NEXT: add v1.2d, v3.2d, v2.2d ; CHECK-NEXT: add v0.2d, v1.2d, v0.2d ; CHECK-NEXT: ret %t0 = add <2 x i64> %x0, %x1 %t1 = add <2 x i64> %x2, %t0 %t2 = add <2 x i64> %x3, %t1 ret <2 x i64> %t2 } ; Verify that vector bitwise operations are reassociated. define <16 x i8> @reassociate_ands_v16i8(<16 x i8> %x0, <16 x i8> %x1, <16 x i8> %x2, <16 x i8> %x3) { ; CHECK-LABEL: reassociate_ands_v16i8: ; CHECK: // %bb.0: ; CHECK-NEXT: orr v0.16b, v0.16b, v1.16b ; CHECK-NEXT: and v1.16b, v2.16b, v3.16b ; CHECK-NEXT: and v0.16b, v0.16b, v1.16b ; CHECK-NEXT: ret %t0 = or <16 x i8> %x0, %x1 %t1 = and <16 x i8> %t0, %x2 %t2 = and <16 x i8> %t1, %x3 ret <16 x i8> %t2 } define <4 x i16> @reassociate_ors_v4i16(<4 x i16> %x0, <4 x i16> %x1, <4 x i16> %x2, <4 x i16> %x3) { ; CHECK-LABEL: reassociate_ors_v4i16: ; CHECK: // %bb.0: ; CHECK-NEXT: eor v0.8b, v0.8b, v1.8b ; CHECK-NEXT: orr v1.8b, v2.8b, v3.8b ; CHECK-NEXT: orr v0.8b, v0.8b, v1.8b ; CHECK-NEXT: ret %t0 = xor <4 x i16> %x0, %x1 %t1 = or <4 x i16> %t0, %x2 %t2 = or <4 x i16> %t1, %x3 ret <4 x i16> %t2 } define <4 x i32> @reassociate_xors_v4i32(<4 x i32> %x0, <4 x i32> %x1, <4 x i32> %x2, <4 x i32> %x3) { ; CHECK-LABEL: reassociate_xors_v4i32: ; CHECK: // %bb.0: ; CHECK-NEXT: and v0.16b, v0.16b, v1.16b ; CHECK-NEXT: eor v1.16b, v2.16b, v3.16b ; CHECK-NEXT: eor v0.16b, v0.16b, v1.16b ; CHECK-NEXT: ret %t0 = and <4 x i32> %x0, %x1 %t1 = xor <4 x i32> %t0, %x2 %t2 = xor <4 x i32> %t1, %x3 ret <4 x i32> %t2 } ; Verify that scalable vector FP arithmetic operations are reassociated. define @reassociate_adds_nxv4f16( %x0, %x1, %x2, %x3) { ; CHECK-STD-LABEL: reassociate_adds_nxv4f16: ; CHECK-STD: // %bb.0: ; CHECK-STD-NEXT: fadd z0.h, z0.h, z1.h ; CHECK-STD-NEXT: fadd z0.h, z2.h, z0.h ; CHECK-STD-NEXT: fadd z0.h, z3.h, z0.h ; CHECK-STD-NEXT: ret ; ; CHECK-UNSAFE-LABEL: reassociate_adds_nxv4f16: ; CHECK-UNSAFE: // %bb.0: ; CHECK-UNSAFE-NEXT: fadd z0.h, z0.h, z1.h ; CHECK-UNSAFE-NEXT: fadd z1.h, z3.h, z2.h ; CHECK-UNSAFE-NEXT: fadd z0.h, z1.h, z0.h ; CHECK-UNSAFE-NEXT: ret %t0 = fadd reassoc %x0, %x1 %t1 = fadd reassoc %x2, %t0 %t2 = fadd reassoc %x3, %t1 ret %t2 } define @reassociate_adds_nxv4f32( %x0, %x1, %x2, %x3) { ; CHECK-STD-LABEL: reassociate_adds_nxv4f32: ; CHECK-STD: // %bb.0: ; CHECK-STD-NEXT: fadd z0.s, z0.s, z1.s ; CHECK-STD-NEXT: fadd z0.s, z2.s, z0.s ; CHECK-STD-NEXT: fadd z0.s, z3.s, z0.s ; CHECK-STD-NEXT: ret ; ; CHECK-UNSAFE-LABEL: reassociate_adds_nxv4f32: ; CHECK-UNSAFE: // %bb.0: ; CHECK-UNSAFE-NEXT: fadd z0.s, z0.s, z1.s ; CHECK-UNSAFE-NEXT: fadd z1.s, z3.s, z2.s ; CHECK-UNSAFE-NEXT: fadd z0.s, z1.s, z0.s ; CHECK-UNSAFE-NEXT: ret %t0 = fadd reassoc %x0, %x1 %t1 = fadd reassoc %x2, %t0 %t2 = fadd reassoc %x3, %t1 ret %t2 } define @reassociate_muls_nxv2f64( %x0, %x1, %x2, %x3) { ; CHECK-STD-LABEL: reassociate_muls_nxv2f64: ; CHECK-STD: // %bb.0: ; CHECK-STD-NEXT: fmul z0.d, z0.d, z1.d ; CHECK-STD-NEXT: fmul z0.d, z2.d, z0.d ; CHECK-STD-NEXT: fmul z0.d, z3.d, z0.d ; CHECK-STD-NEXT: ret ; ; CHECK-UNSAFE-LABEL: reassociate_muls_nxv2f64: ; CHECK-UNSAFE: // %bb.0: ; CHECK-UNSAFE-NEXT: fmul z0.d, z0.d, z1.d ; CHECK-UNSAFE-NEXT: fmul z1.d, z3.d, z2.d ; CHECK-UNSAFE-NEXT: fmul z0.d, z1.d, z0.d ; CHECK-UNSAFE-NEXT: ret %t0 = fmul reassoc %x0, %x1 %t1 = fmul reassoc %x2, %t0 %t2 = fmul reassoc %x3, %t1 ret %t2 } ; Verify that scalable vector integer arithmetic operations are reassociated. define @reassociate_muls_nxv16i8( %x0, %x1, %x2, %x3) { ; CHECK-LABEL: reassociate_muls_nxv16i8: ; CHECK: // %bb.0: ; CHECK-NEXT: mul z0.b, z0.b, z1.b ; CHECK-NEXT: mul z1.b, z3.b, z2.b ; CHECK-NEXT: mul z0.b, z1.b, z0.b ; CHECK-NEXT: ret %t0 = mul %x0, %x1 %t1 = mul %x2, %t0 %t2 = mul %x3, %t1 ret %t2 } define @reassociate_adds_nxv8i16( %x0, %x1, %x2, %x3) { ; CHECK-LABEL: reassociate_adds_nxv8i16: ; CHECK: // %bb.0: ; CHECK-NEXT: add z0.h, z0.h, z1.h ; CHECK-NEXT: add z1.h, z3.h, z2.h ; CHECK-NEXT: add z0.h, z1.h, z0.h ; CHECK-NEXT: ret %t0 = add %x0, %x1 %t1 = add %x2, %t0 %t2 = add %x3, %t1 ret %t2 } define @reassociate_muls_nxv4i32( %x0, %x1, %x2, %x3) { ; CHECK-LABEL: reassociate_muls_nxv4i32: ; CHECK: // %bb.0: ; CHECK-NEXT: mul z0.s, z0.s, z1.s ; CHECK-NEXT: mul z1.s, z3.s, z2.s ; CHECK-NEXT: mul z0.s, z1.s, z0.s ; CHECK-NEXT: ret %t0 = mul %x0, %x1 %t1 = mul %x2, %t0 %t2 = mul %x3, %t1 ret %t2 } define @reassociate_adds_nxv2i64( %x0, %x1, %x2, %x3) { ; CHECK-LABEL: reassociate_adds_nxv2i64: ; CHECK: // %bb.0: ; CHECK-NEXT: add z0.d, z0.d, z1.d ; CHECK-NEXT: add z1.d, z3.d, z2.d ; CHECK-NEXT: add z0.d, z1.d, z0.d ; CHECK-NEXT: ret %t0 = add %x0, %x1 %t1 = add %x2, %t0 %t2 = add %x3, %t1 ret %t2 } ; Verify that scalable vector bitwise operations are reassociated. define @reassociate_ands_nxv16i8( %x0, %x1, %x2, %x3) { ; CHECK-LABEL: reassociate_ands_nxv16i8: ; CHECK: // %bb.0: ; CHECK-NEXT: orr z0.d, z0.d, z1.d ; CHECK-NEXT: and z1.d, z2.d, z3.d ; CHECK-NEXT: and z0.d, z0.d, z1.d ; CHECK-NEXT: ret %t0 = or %x0, %x1 %t1 = and %t0, %x2 %t2 = and %t1, %x3 ret %t2 } define @reassociate_ors_nxv8i16( %x0, %x1, %x2, %x3) { ; CHECK-LABEL: reassociate_ors_nxv8i16: ; CHECK: // %bb.0: ; CHECK-NEXT: eor z0.d, z0.d, z1.d ; CHECK-NEXT: orr z1.d, z2.d, z3.d ; CHECK-NEXT: orr z0.d, z0.d, z1.d ; CHECK-NEXT: ret %t0 = xor %x0, %x1 %t1 = or %t0, %x2 %t2 = or %t1, %x3 ret %t2 } ; PR25016: https://llvm.org/bugs/show_bug.cgi?id=25016 ; Verify that reassociation is not happening needlessly or wrongly. declare double @bar() define double @reassociate_adds_from_calls() { ; CHECK-STD-LABEL: reassociate_adds_from_calls: ; CHECK-STD: // %bb.0: ; CHECK-STD-NEXT: str d10, [sp, #-32]! // 8-byte Folded Spill ; CHECK-STD-NEXT: stp d9, d8, [sp, #8] // 16-byte Folded Spill ; CHECK-STD-NEXT: str x30, [sp, #24] // 8-byte Folded Spill ; CHECK-STD-NEXT: .cfi_def_cfa_offset 32 ; CHECK-STD-NEXT: .cfi_offset w30, -8 ; CHECK-STD-NEXT: .cfi_offset b8, -16 ; CHECK-STD-NEXT: .cfi_offset b9, -24 ; CHECK-STD-NEXT: .cfi_offset b10, -32 ; CHECK-STD-NEXT: bl bar ; CHECK-STD-NEXT: fmov d8, d0 ; CHECK-STD-NEXT: bl bar ; CHECK-STD-NEXT: fmov d9, d0 ; CHECK-STD-NEXT: bl bar ; CHECK-STD-NEXT: fmov d10, d0 ; CHECK-STD-NEXT: bl bar ; CHECK-STD-NEXT: fadd d1, d8, d9 ; CHECK-STD-NEXT: ldp d9, d8, [sp, #8] // 16-byte Folded Reload ; CHECK-STD-NEXT: ldr x30, [sp, #24] // 8-byte Folded Reload ; CHECK-STD-NEXT: fadd d1, d1, d10 ; CHECK-STD-NEXT: fadd d0, d1, d0 ; CHECK-STD-NEXT: ldr d10, [sp], #32 // 8-byte Folded Reload ; CHECK-STD-NEXT: ret ; ; CHECK-UNSAFE-LABEL: reassociate_adds_from_calls: ; CHECK-UNSAFE: // %bb.0: ; CHECK-UNSAFE-NEXT: str d10, [sp, #-32]! // 8-byte Folded Spill ; CHECK-UNSAFE-NEXT: stp d9, d8, [sp, #8] // 16-byte Folded Spill ; CHECK-UNSAFE-NEXT: str x30, [sp, #24] // 8-byte Folded Spill ; CHECK-UNSAFE-NEXT: .cfi_def_cfa_offset 32 ; CHECK-UNSAFE-NEXT: .cfi_offset w30, -8 ; CHECK-UNSAFE-NEXT: .cfi_offset b8, -16 ; CHECK-UNSAFE-NEXT: .cfi_offset b9, -24 ; CHECK-UNSAFE-NEXT: .cfi_offset b10, -32 ; CHECK-UNSAFE-NEXT: bl bar ; CHECK-UNSAFE-NEXT: fmov d8, d0 ; CHECK-UNSAFE-NEXT: bl bar ; CHECK-UNSAFE-NEXT: fmov d9, d0 ; CHECK-UNSAFE-NEXT: bl bar ; CHECK-UNSAFE-NEXT: fmov d10, d0 ; CHECK-UNSAFE-NEXT: bl bar ; CHECK-UNSAFE-NEXT: fadd d1, d8, d9 ; CHECK-UNSAFE-NEXT: ldp d9, d8, [sp, #8] // 16-byte Folded Reload ; CHECK-UNSAFE-NEXT: ldr x30, [sp, #24] // 8-byte Folded Reload ; CHECK-UNSAFE-NEXT: fadd d0, d10, d0 ; CHECK-UNSAFE-NEXT: fadd d0, d1, d0 ; CHECK-UNSAFE-NEXT: ldr d10, [sp], #32 // 8-byte Folded Reload ; CHECK-UNSAFE-NEXT: ret %x0 = call double @bar() %x1 = call double @bar() %x2 = call double @bar() %x3 = call double @bar() %t0 = fadd double %x0, %x1 %t1 = fadd double %t0, %x2 %t2 = fadd double %t1, %x3 ret double %t2 } define double @already_reassociated() { ; CHECK-LABEL: already_reassociated: ; CHECK: // %bb.0: ; CHECK-NEXT: str d10, [sp, #-32]! // 8-byte Folded Spill ; CHECK-NEXT: stp d9, d8, [sp, #8] // 16-byte Folded Spill ; CHECK-NEXT: str x30, [sp, #24] // 8-byte Folded Spill ; CHECK-NEXT: .cfi_def_cfa_offset 32 ; CHECK-NEXT: .cfi_offset w30, -8 ; CHECK-NEXT: .cfi_offset b8, -16 ; CHECK-NEXT: .cfi_offset b9, -24 ; CHECK-NEXT: .cfi_offset b10, -32 ; CHECK-NEXT: bl bar ; CHECK-NEXT: fmov d8, d0 ; CHECK-NEXT: bl bar ; CHECK-NEXT: fmov d9, d0 ; CHECK-NEXT: bl bar ; CHECK-NEXT: fmov d10, d0 ; CHECK-NEXT: bl bar ; CHECK-NEXT: fadd d1, d8, d9 ; CHECK-NEXT: ldp d9, d8, [sp, #8] // 16-byte Folded Reload ; CHECK-NEXT: ldr x30, [sp, #24] // 8-byte Folded Reload ; CHECK-NEXT: fadd d0, d10, d0 ; CHECK-NEXT: fadd d0, d1, d0 ; CHECK-NEXT: ldr d10, [sp], #32 // 8-byte Folded Reload ; CHECK-NEXT: ret %x0 = call double @bar() %x1 = call double @bar() %x2 = call double @bar() %x3 = call double @bar() %t0 = fadd double %x0, %x1 %t1 = fadd double %x2, %x3 %t2 = fadd double %t0, %t1 ret double %t2 }