; NOTE: Assertions have been autogenerated by utils/update_test_checks.py ; RUN: opt < %s -passes=instcombine -S | FileCheck %s declare void @use(float) define float @fneg_fneg(float %a) { ; ; CHECK-LABEL: @fneg_fneg( ; CHECK-NEXT: ret float [[A:%.*]] ; %f = fneg float %a %r = fneg float %f ret float %r } ; -(X * C) --> X * (-C) define float @fmul_fsub(float %x) { ; CHECK-LABEL: @fmul_fsub( ; CHECK-NEXT: [[R:%.*]] = fmul float [[X:%.*]], -4.200000e+01 ; CHECK-NEXT: ret float [[R]] ; %m = fmul float %x, 42.0 %r = fsub float -0.0, %m ret float %r } define float @fmul_fneg(float %x) { ; CHECK-LABEL: @fmul_fneg( ; CHECK-NEXT: [[R:%.*]] = fmul float [[X:%.*]], -4.200000e+01 ; CHECK-NEXT: ret float [[R]] ; %m = fmul float %x, 42.0 %r = fneg float %m ret float %r } ; Fast math is not required, but it should be propagated. define float @fmul_fsub_fmf(float %x) { ; CHECK-LABEL: @fmul_fsub_fmf( ; CHECK-NEXT: [[R:%.*]] = fmul reassoc nsz float [[X:%.*]], -4.200000e+01 ; CHECK-NEXT: ret float [[R]] ; %m = fmul float %x, 42.0 %r = fsub reassoc nsz float -0.0, %m ret float %r } define float @fmul_fneg_fmf(float %x) { ; CHECK-LABEL: @fmul_fneg_fmf( ; CHECK-NEXT: [[R:%.*]] = fmul reassoc nsz float [[X:%.*]], -4.200000e+01 ; CHECK-NEXT: ret float [[R]] ; %m = fmul float %x, 42.0 %r = fneg reassoc nsz float %m ret float %r } ; Extra use prevents the fold. We don't want to replace the fneg with an fmul. define float @fmul_fsub_extra_use(float %x) { ; CHECK-LABEL: @fmul_fsub_extra_use( ; CHECK-NEXT: [[M:%.*]] = fmul float [[X:%.*]], 4.200000e+01 ; CHECK-NEXT: [[R:%.*]] = fneg float [[M]] ; CHECK-NEXT: call void @use(float [[M]]) ; CHECK-NEXT: ret float [[R]] ; %m = fmul float %x, 42.0 %r = fsub float -0.0, %m call void @use(float %m) ret float %r } define float @fmul_fneg_extra_use(float %x) { ; CHECK-LABEL: @fmul_fneg_extra_use( ; CHECK-NEXT: [[M:%.*]] = fmul float [[X:%.*]], 4.200000e+01 ; CHECK-NEXT: [[R:%.*]] = fneg float [[M]] ; CHECK-NEXT: call void @use(float [[M]]) ; CHECK-NEXT: ret float [[R]] ; %m = fmul float %x, 42.0 %r = fneg float %m call void @use(float %m) ret float %r } ; Try a vector. Use special constants (NaN, INF, undef) because they don't change anything. define <4 x double> @fmul_fsub_vec(<4 x double> %x) { ; CHECK-LABEL: @fmul_fsub_vec( ; CHECK-NEXT: [[R:%.*]] = fmul <4 x double> [[X:%.*]], <double -4.200000e+01, double 0xFFF8000000000000, double 0xFFF0000000000000, double undef> ; CHECK-NEXT: ret <4 x double> [[R]] ; %m = fmul <4 x double> %x, <double 42.0, double 0x7FF8000000000000, double 0x7FF0000000000000, double undef> %r = fsub <4 x double> <double -0.0, double -0.0, double -0.0, double -0.0>, %m ret <4 x double> %r } define <4 x double> @fmul_fneg_vec(<4 x double> %x) { ; CHECK-LABEL: @fmul_fneg_vec( ; CHECK-NEXT: [[R:%.*]] = fmul <4 x double> [[X:%.*]], <double -4.200000e+01, double 0xFFF8000000000000, double 0xFFF0000000000000, double undef> ; CHECK-NEXT: ret <4 x double> [[R]] ; %m = fmul <4 x double> %x, <double 42.0, double 0x7FF8000000000000, double 0x7FF0000000000000, double undef> %r = fneg <4 x double> %m ret <4 x double> %r } ; -(X / C) --> X / (-C) define float @fdiv_op1_constant_fsub(float %x) { ; CHECK-LABEL: @fdiv_op1_constant_fsub( ; CHECK-NEXT: [[R:%.*]] = fdiv float [[X:%.*]], 4.200000e+01 ; CHECK-NEXT: ret float [[R]] ; %d = fdiv float %x, -42.0 %r = fsub float -0.0, %d ret float %r } define float @fdiv_op1_constant_fneg(float %x) { ; CHECK-LABEL: @fdiv_op1_constant_fneg( ; CHECK-NEXT: [[R:%.*]] = fdiv float [[X:%.*]], 4.200000e+01 ; CHECK-NEXT: ret float [[R]] ; %d = fdiv float %x, -42.0 %r = fneg float %d ret float %r } ; Fast math is not required, but it should be propagated. define float @fdiv_op1_constant_fsub_fmf(float %x) { ; CHECK-LABEL: @fdiv_op1_constant_fsub_fmf( ; CHECK-NEXT: [[R:%.*]] = fdiv nnan float [[X:%.*]], 4.200000e+01 ; CHECK-NEXT: ret float [[R]] ; %d = fdiv float %x, -42.0 %r = fsub nnan float -0.0, %d ret float %r } define float @fdiv_op1_constant_fneg_fmf(float %x) { ; CHECK-LABEL: @fdiv_op1_constant_fneg_fmf( ; CHECK-NEXT: [[R:%.*]] = fdiv nnan float [[X:%.*]], 4.200000e+01 ; CHECK-NEXT: ret float [[R]] ; %d = fdiv float %x, -42.0 %r = fneg nnan float %d ret float %r } ; Extra use prevents the fold. We don't want to replace the fneg with an fdiv. define float @fdiv_op1_constant_fsub_extra_use(float %x) { ; CHECK-LABEL: @fdiv_op1_constant_fsub_extra_use( ; CHECK-NEXT: [[D:%.*]] = fdiv float [[X:%.*]], 4.200000e+01 ; CHECK-NEXT: [[R:%.*]] = fneg float [[D]] ; CHECK-NEXT: call void @use(float [[D]]) ; CHECK-NEXT: ret float [[R]] ; %d = fdiv float %x, 42.0 %r = fsub float -0.0, %d call void @use(float %d) ret float %r } define float @fdiv_op1_constant_fneg_extra_use(float %x) { ; CHECK-LABEL: @fdiv_op1_constant_fneg_extra_use( ; CHECK-NEXT: [[D:%.*]] = fdiv float [[X:%.*]], 4.200000e+01 ; CHECK-NEXT: [[R:%.*]] = fneg float [[D]] ; CHECK-NEXT: call void @use(float [[D]]) ; CHECK-NEXT: ret float [[R]] ; %d = fdiv float %x, 42.0 %r = fneg float %d call void @use(float %d) ret float %r } ; Try a vector. Use special constants (NaN, INF, undef) because they don't change anything. define <4 x double> @fdiv_op1_constant_fsub_vec(<4 x double> %x) { ; CHECK-LABEL: @fdiv_op1_constant_fsub_vec( ; CHECK-NEXT: [[R:%.*]] = fdiv <4 x double> [[X:%.*]], <double 4.200000e+01, double 0x7FF800000ABCD000, double 0x7FF0000000000000, double undef> ; CHECK-NEXT: ret <4 x double> [[R]] ; %d = fdiv <4 x double> %x, <double -42.0, double 0xFFF800000ABCD000, double 0xFFF0000000000000, double undef> %r = fsub <4 x double> <double -0.0, double -0.0, double -0.0, double -0.0>, %d ret <4 x double> %r } define <4 x double> @fdiv_op1_constant_fneg_vec(<4 x double> %x) { ; CHECK-LABEL: @fdiv_op1_constant_fneg_vec( ; CHECK-NEXT: [[R:%.*]] = fdiv <4 x double> [[X:%.*]], <double 4.200000e+01, double 0x7FF800000ABCD000, double 0x7FF0000000000000, double undef> ; CHECK-NEXT: ret <4 x double> [[R]] ; %d = fdiv <4 x double> %x, <double -42.0, double 0xFFF800000ABCD000, double 0xFFF0000000000000, double undef> %r = fneg <4 x double> %d ret <4 x double> %r } ; -(C / X) --> (-C) / X define float @fdiv_op0_constant_fsub(float %x) { ; CHECK-LABEL: @fdiv_op0_constant_fsub( ; CHECK-NEXT: [[R:%.*]] = fdiv float -4.200000e+01, [[X:%.*]] ; CHECK-NEXT: ret float [[R]] ; %d = fdiv float 42.0, %x %r = fsub float -0.0, %d ret float %r } define float @fdiv_op0_constant_fneg(float %x) { ; CHECK-LABEL: @fdiv_op0_constant_fneg( ; CHECK-NEXT: [[R:%.*]] = fdiv float -4.200000e+01, [[X:%.*]] ; CHECK-NEXT: ret float [[R]] ; %d = fdiv float 42.0, %x %r = fneg float %d ret float %r } ; Fast math is not required, but it should be propagated. define float @fdiv_op0_constant_fneg_fast_fast(float %x) { ; CHECK-LABEL: @fdiv_op0_constant_fneg_fast_fast( ; CHECK-NEXT: [[R:%.*]] = fdiv fast float -4.200000e+01, [[X:%.*]] ; CHECK-NEXT: ret float [[R]] ; %d = fdiv fast float 42.0, %x %r = fneg fast float %d ret float %r } define float @fdiv_op0_constant_fneg_fast(float %x) { ; CHECK-LABEL: @fdiv_op0_constant_fneg_fast( ; CHECK-NEXT: [[R:%.*]] = fdiv reassoc nnan arcp contract afn float -4.200000e+01, [[X:%.*]] ; CHECK-NEXT: ret float [[R]] ; %d = fdiv float 42.0, %x %r = fneg fast float %d ret float %r } define float @fdiv_op0_constant_fneg_nsz_nsz(float %x) { ; CHECK-LABEL: @fdiv_op0_constant_fneg_nsz_nsz( ; CHECK-NEXT: [[R:%.*]] = fdiv nsz float -4.200000e+01, [[X:%.*]] ; CHECK-NEXT: ret float [[R]] ; %d = fdiv nsz float 42.0, %x %r = fneg nsz float %d ret float %r } define float @fdiv_op0_constant_fneg_nsz(float %x) { ; CHECK-LABEL: @fdiv_op0_constant_fneg_nsz( ; CHECK-NEXT: [[R:%.*]] = fdiv float -4.200000e+01, [[X:%.*]] ; CHECK-NEXT: ret float [[R]] ; %d = fdiv float 42.0, %x %r = fneg nsz float %d ret float %r } define float @fdiv_op0_constant_fneg_ninf_ninf(float %x) { ; CHECK-LABEL: @fdiv_op0_constant_fneg_ninf_ninf( ; CHECK-NEXT: [[R:%.*]] = fdiv ninf float -4.200000e+01, [[X:%.*]] ; CHECK-NEXT: ret float [[R]] ; %d = fdiv ninf float 42.0, %x %r = fneg ninf float %d ret float %r } define float @fdiv_op0_constant_fneg_ninf(float %x) { ; CHECK-LABEL: @fdiv_op0_constant_fneg_ninf( ; CHECK-NEXT: [[R:%.*]] = fdiv float -4.200000e+01, [[X:%.*]] ; CHECK-NEXT: ret float [[R]] ; %d = fdiv float 42.0, %x %r = fneg ninf float %d ret float %r } define float @fdiv_op0_constant_fneg_nnan_nnan(float %x) { ; CHECK-LABEL: @fdiv_op0_constant_fneg_nnan_nnan( ; CHECK-NEXT: [[R:%.*]] = fdiv nnan float -4.200000e+01, [[X:%.*]] ; CHECK-NEXT: ret float [[R]] ; %d = fdiv nnan float 42.0, %x %r = fneg nnan float %d ret float %r } define float @fdiv_op0_constant_fneg_nnan(float %x) { ; CHECK-LABEL: @fdiv_op0_constant_fneg_nnan( ; CHECK-NEXT: [[R:%.*]] = fdiv nnan float -4.200000e+01, [[X:%.*]] ; CHECK-NEXT: ret float [[R]] ; %d = fdiv float 42.0, %x %r = fneg nnan float %d ret float %r } ; Extra use prevents the fold. We don't want to replace the fneg with an fdiv. define float @fdiv_op0_constant_fsub_extra_use(float %x) { ; CHECK-LABEL: @fdiv_op0_constant_fsub_extra_use( ; CHECK-NEXT: [[D:%.*]] = fdiv float -4.200000e+01, [[X:%.*]] ; CHECK-NEXT: [[R:%.*]] = fneg float [[D]] ; CHECK-NEXT: call void @use(float [[D]]) ; CHECK-NEXT: ret float [[R]] ; %d = fdiv float -42.0, %x %r = fsub float -0.0, %d call void @use(float %d) ret float %r } define float @fdiv_op0_constant_fneg_extra_use(float %x) { ; CHECK-LABEL: @fdiv_op0_constant_fneg_extra_use( ; CHECK-NEXT: [[D:%.*]] = fdiv float -4.200000e+01, [[X:%.*]] ; CHECK-NEXT: [[R:%.*]] = fneg float [[D]] ; CHECK-NEXT: call void @use(float [[D]]) ; CHECK-NEXT: ret float [[R]] ; %d = fdiv float -42.0, %x %r = fneg float %d call void @use(float %d) ret float %r } ; Try a vector. Use special constants (NaN, INF, undef) because they don't change anything. define <4 x double> @fdiv_op0_constant_fsub_vec(<4 x double> %x) { ; CHECK-LABEL: @fdiv_op0_constant_fsub_vec( ; CHECK-NEXT: [[R:%.*]] = fdiv <4 x double> <double 4.200000e+01, double 0xFFF8000000000000, double 0x7FF0000000000000, double undef>, [[X:%.*]] ; CHECK-NEXT: ret <4 x double> [[R]] ; %d = fdiv <4 x double> <double -42.0, double 0x7FF8000000000000, double 0xFFF0000000000000, double undef>, %x %r = fsub <4 x double> <double -0.0, double -0.0, double -0.0, double -0.0>, %d ret <4 x double> %r } define <4 x double> @fdiv_op0_constant_fneg_vec(<4 x double> %x) { ; CHECK-LABEL: @fdiv_op0_constant_fneg_vec( ; CHECK-NEXT: [[R:%.*]] = fdiv <4 x double> <double 4.200000e+01, double 0xFFF8000000000000, double 0x7FF0000000000000, double undef>, [[X:%.*]] ; CHECK-NEXT: ret <4 x double> [[R]] ; %d = fdiv <4 x double> <double -42.0, double 0x7FF8000000000000, double 0xFFF0000000000000, double undef>, %x %r = fneg <4 x double> %d ret <4 x double> %r } ; Sink FP negation through a select: ; c ? -x : -y --> -(c ? x : y) define <2 x double> @fneg_fneg_sel(<2 x double> %x, <2 x double> %y, i1 %cond) { ; CHECK-LABEL: @fneg_fneg_sel( ; CHECK-NEXT: [[SEL_V:%.*]] = select i1 [[COND:%.*]], <2 x double> [[X:%.*]], <2 x double> [[Y:%.*]] ; CHECK-NEXT: [[SEL:%.*]] = fneg <2 x double> [[SEL_V]] ; CHECK-NEXT: ret <2 x double> [[SEL]] ; %n1 = fneg <2 x double> %x %n2 = fneg <2 x double> %y %sel = select i1 %cond, <2 x double> %n1, <2 x double> %n2 ret <2 x double> %sel } ; An extra use is allowed. define float @fneg_fneg_sel_extra_use1(float %x, float %y, i1 %cond) { ; CHECK-LABEL: @fneg_fneg_sel_extra_use1( ; CHECK-NEXT: [[N1:%.*]] = fneg float [[X:%.*]] ; CHECK-NEXT: call void @use(float [[N1]]) ; CHECK-NEXT: [[SEL_V:%.*]] = select i1 [[COND:%.*]], float [[X]], float [[Y:%.*]] ; CHECK-NEXT: [[SEL:%.*]] = fneg float [[SEL_V]] ; CHECK-NEXT: ret float [[SEL]] ; %n1 = fneg float %x call void @use(float %n1) %n2 = fneg float %y %sel = select i1 %cond, float %n1, float %n2 ret float %sel } define float @fneg_fneg_sel_extra_use2(float %x, float %y, i1 %cond) { ; CHECK-LABEL: @fneg_fneg_sel_extra_use2( ; CHECK-NEXT: [[N2:%.*]] = fneg float [[Y:%.*]] ; CHECK-NEXT: call void @use(float [[N2]]) ; CHECK-NEXT: [[SEL_V:%.*]] = select i1 [[COND:%.*]], float [[X:%.*]], float [[Y]] ; CHECK-NEXT: [[SEL:%.*]] = fneg float [[SEL_V]] ; CHECK-NEXT: ret float [[SEL]] ; %n1 = fneg float %x %n2 = fneg float %y call void @use(float %n2) %sel = select i1 %cond, float %n1, float %n2 ret float %sel } ; Legacy form of fneg should work too. define float @fsub_fsub_sel_extra_use1(float %x, float %y, i1 %cond) { ; CHECK-LABEL: @fsub_fsub_sel_extra_use1( ; CHECK-NEXT: [[N1:%.*]] = fneg float [[X:%.*]] ; CHECK-NEXT: call void @use(float [[N1]]) ; CHECK-NEXT: [[SEL_V:%.*]] = select i1 [[COND:%.*]], float [[X]], float [[Y:%.*]] ; CHECK-NEXT: [[SEL:%.*]] = fneg float [[SEL_V]] ; CHECK-NEXT: ret float [[SEL]] ; %n1 = fsub float -0.0, %x call void @use(float %n1) %n2 = fsub float -0.0, %y %sel = select i1 %cond, float %n1, float %n2 ret float %sel } ; Negative test: but 2 extra uses would require an extra instruction. define float @fneg_fneg_sel_extra_use3(float %x, float %y, i1 %cond) { ; CHECK-LABEL: @fneg_fneg_sel_extra_use3( ; CHECK-NEXT: [[N1:%.*]] = fneg float [[X:%.*]] ; CHECK-NEXT: call void @use(float [[N1]]) ; CHECK-NEXT: [[N2:%.*]] = fneg float [[Y:%.*]] ; CHECK-NEXT: call void @use(float [[N2]]) ; CHECK-NEXT: [[SEL:%.*]] = select i1 [[COND:%.*]], float [[N1]], float [[N2]] ; CHECK-NEXT: ret float [[SEL]] ; %n1 = fneg float %x call void @use(float %n1) %n2 = fneg float %y call void @use(float %n2) %sel = select i1 %cond, float %n1, float %n2 ret float %sel } define double @fneg_fneg_sel_fmf1(double %x, double %y, i1 %cond) { ; CHECK-LABEL: @fneg_fneg_sel_fmf1( ; CHECK-NEXT: [[SEL_V:%.*]] = select i1 [[COND:%.*]], double [[X:%.*]], double [[Y:%.*]] ; CHECK-NEXT: [[SEL:%.*]] = fneg double [[SEL_V]] ; CHECK-NEXT: ret double [[SEL]] ; %n1 = fneg nnan double %x %n2 = fneg ninf double %y %sel = select i1 %cond, double %n1, double %n2 ret double %sel } define double @fneg_fneg_sel_fmf2(double %x, double %y, i1 %cond) { ; CHECK-LABEL: @fneg_fneg_sel_fmf2( ; CHECK-NEXT: [[SEL_V:%.*]] = select ninf i1 [[COND:%.*]], double [[X:%.*]], double [[Y:%.*]] ; CHECK-NEXT: [[SEL:%.*]] = fneg ninf double [[SEL_V]] ; CHECK-NEXT: ret double [[SEL]] ; %n1 = fneg nnan ninf double %x %n2 = fneg ninf double %y %sel = select i1 %cond, double %n1, double %n2 ret double %sel } define double @fneg_fneg_sel_fmf3(double %x, double %y, i1 %cond) { ; CHECK-LABEL: @fneg_fneg_sel_fmf3( ; CHECK-NEXT: [[SEL_V:%.*]] = select ninf i1 [[COND:%.*]], double [[X:%.*]], double [[Y:%.*]] ; CHECK-NEXT: [[SEL:%.*]] = fneg ninf double [[SEL_V]] ; CHECK-NEXT: ret double [[SEL]] ; %n1 = fneg nnan ninf double %x %n2 = fneg ninf double %y %sel = select ninf i1 %cond, double %n1, double %n2 ret double %sel } define double @fneg_fneg_sel_fmf4(double %x, double %y, i1 %cond) { ; CHECK-LABEL: @fneg_fneg_sel_fmf4( ; CHECK-NEXT: [[SEL_V:%.*]] = select nnan ninf nsz i1 [[COND:%.*]], double [[X:%.*]], double [[Y:%.*]] ; CHECK-NEXT: [[SEL:%.*]] = fneg nnan ninf nsz double [[SEL_V]] ; CHECK-NEXT: ret double [[SEL]] ; %n1 = fneg nnan double %x %n2 = fneg ninf double %y %sel = select nsz nnan ninf i1 %cond, double %n1, double %n2 ret double %sel } ; Negative test define float @fneg_fadd_constant(float %x) { ; CHECK-LABEL: @fneg_fadd_constant( ; CHECK-NEXT: [[A:%.*]] = fadd float [[X:%.*]], 4.200000e+01 ; CHECK-NEXT: [[R:%.*]] = fneg float [[A]] ; CHECK-NEXT: ret float [[R]] ; %a = fadd float %x, 42.0 %r = fneg float %a ret float %r } ; Negative test define float @fake_nsz_fadd_constant(float %x) { ; CHECK-LABEL: @fake_nsz_fadd_constant( ; CHECK-NEXT: [[A:%.*]] = fadd float [[X:%.*]], 4.200000e+01 ; CHECK-NEXT: [[R:%.*]] = fneg float [[A]] ; CHECK-NEXT: ret float [[R]] ; %a = fadd float %x, 42.0 %r = fsub float -0.0, %a ret float %r } ; -(X + C) --> -C - X define float @fneg_nsz_fadd_constant(float %x) { ; CHECK-LABEL: @fneg_nsz_fadd_constant( ; CHECK-NEXT: [[R:%.*]] = fsub nsz float -4.200000e+01, [[X:%.*]] ; CHECK-NEXT: ret float [[R]] ; %a = fadd float %x, 42.0 %r = fneg nsz float %a ret float %r } ; -(X + C) --> -C - X define float @fake_fneg_nsz_fadd_constant(float %x) { ; CHECK-LABEL: @fake_fneg_nsz_fadd_constant( ; CHECK-NEXT: [[R:%.*]] = fsub fast float -4.200000e+01, [[X:%.*]] ; CHECK-NEXT: ret float [[R]] ; %a = fadd float %x, 42.0 %r = fsub fast float -0.0, %a ret float %r } ; Negative test define float @fneg_nsz_fadd_constant_extra_use(float %x) { ; CHECK-LABEL: @fneg_nsz_fadd_constant_extra_use( ; CHECK-NEXT: [[A:%.*]] = fadd float [[X:%.*]], 4.200000e+01 ; CHECK-NEXT: call void @use(float [[A]]) ; CHECK-NEXT: [[R:%.*]] = fneg nsz float [[A]] ; CHECK-NEXT: ret float [[R]] ; %a = fadd float %x, 42.0 call void @use(float %a) %r = fneg nsz float %a ret float %r } ; Negative test define float @fake_fneg_nsz_fadd_constant_extra_use(float %x) { ; CHECK-LABEL: @fake_fneg_nsz_fadd_constant_extra_use( ; CHECK-NEXT: [[A:%.*]] = fadd float [[X:%.*]], 4.200000e+01 ; CHECK-NEXT: call void @use(float [[A]]) ; CHECK-NEXT: [[R:%.*]] = fneg fast float [[A]] ; CHECK-NEXT: ret float [[R]] ; %a = fadd float %x, 42.0 call void @use(float %a) %r = fsub fast float -0.0, %a ret float %r } ; -(X + C) --> -C - X define <2 x float> @fneg_nsz_fadd_constant_vec(<2 x float> %x) { ; CHECK-LABEL: @fneg_nsz_fadd_constant_vec( ; CHECK-NEXT: [[R:%.*]] = fsub reassoc nnan nsz <2 x float> <float -4.200000e+01, float -4.300000e+01>, [[X:%.*]] ; CHECK-NEXT: ret <2 x float> [[R]] ; %a = fadd <2 x float> %x, <float 42.0, float 43.0> %r = fneg nsz nnan reassoc <2 x float> %a ret <2 x float> %r } ; -(X + C) --> -C - X define <2 x float> @fake_fneg_nsz_fadd_constant_vec(<2 x float> %x) { ; CHECK-LABEL: @fake_fneg_nsz_fadd_constant_vec( ; CHECK-NEXT: [[R:%.*]] = fsub nsz <2 x float> <float -4.200000e+01, float undef>, [[X:%.*]] ; CHECK-NEXT: ret <2 x float> [[R]] ; %a = fadd <2 x float> %x, <float 42.0, float undef> %r = fsub nsz <2 x float> <float undef, float -0.0>, %a ret <2 x float> %r } @g = external global i16, align 1 define float @fneg_nsz_fadd_constant_expr(float %x) { ; CHECK-LABEL: @fneg_nsz_fadd_constant_expr( ; CHECK-NEXT: [[R:%.*]] = fsub nsz float fneg (float bitcast (i32 ptrtoint (i16* @g to i32) to float)), [[X:%.*]] ; CHECK-NEXT: ret float [[R]] ; %a = fadd float %x, bitcast (i32 ptrtoint (i16* @g to i32) to float) %r = fneg nsz float %a ret float %r } define float @fake_fneg_nsz_fadd_constant_expr(float %x) { ; CHECK-LABEL: @fake_fneg_nsz_fadd_constant_expr( ; CHECK-NEXT: [[R:%.*]] = fsub nsz float fneg (float bitcast (i32 ptrtoint (i16* @g to i32) to float)), [[X:%.*]] ; CHECK-NEXT: ret float [[R]] ; %a = fadd float %x, bitcast (i32 ptrtoint (i16* @g to i32) to float) %r = fsub nsz float -0.0, %a ret float %r } define float @select_fneg_true(float %x, float %y, i1 %b) { ; CHECK-LABEL: @select_fneg_true( ; CHECK-NEXT: [[Y_NEG:%.*]] = fneg float [[Y:%.*]] ; CHECK-NEXT: [[R:%.*]] = select i1 [[B:%.*]], float [[X:%.*]], float [[Y_NEG]] ; CHECK-NEXT: ret float [[R]] ; %nx = fneg float %x %s = select i1 %b, float %nx, float %y %r = fneg float %s ret float %r } define <2 x float> @select_fneg_false(<2 x float> %x, <2 x float> %y, <2 x i1> %b) { ; CHECK-LABEL: @select_fneg_false( ; CHECK-NEXT: [[X_NEG:%.*]] = fneg nnan nsz <2 x float> [[X:%.*]] ; CHECK-NEXT: [[R:%.*]] = select nnan <2 x i1> [[B:%.*]], <2 x float> [[X_NEG]], <2 x float> [[Y:%.*]] ; CHECK-NEXT: ret <2 x float> [[R]] ; %ny = fneg nnan <2 x float> %y %s = select ninf <2 x i1> %b, <2 x float> %x, <2 x float> %ny %r = fneg nsz nnan <2 x float> %s ret <2 x float> %r } define float @select_fneg_false_no_nsz(float %x, float %y, i1 %b) { ; CHECK-LABEL: @select_fneg_false_no_nsz( ; CHECK-NEXT: [[X_NEG:%.*]] = fneg nnan ninf nsz float [[X:%.*]] ; CHECK-NEXT: [[R:%.*]] = select nnan ninf i1 [[B:%.*]], float [[X_NEG]], float [[Y:%.*]] ; CHECK-NEXT: ret float [[R]] ; %ny = fneg float %y %s = select i1 %b, float %x, float %ny %r = fneg ninf nnan nsz float %s ret float %r } ; The removal of nsz in this pattern is not needed if the select condition can't be poison. define float @select_fneg_false_nsz_ok(float %x, float %y, i1 noundef %b) { ; CHECK-LABEL: @select_fneg_false_nsz_ok( ; CHECK-NEXT: [[X_NEG:%.*]] = fneg nnan ninf nsz float [[X:%.*]] ; CHECK-NEXT: [[R:%.*]] = select nnan ninf nsz i1 [[B:%.*]], float [[X_NEG]], float [[Y:%.*]] ; CHECK-NEXT: ret float [[R]] ; %ny = fneg float %y %s = select i1 %b, float %x, float %ny %r = fneg nsz ninf nnan float %s ret float %r } define float @select_fneg_false_nsz(float %x, float %y, i1 %b) { ; CHECK-LABEL: @select_fneg_false_nsz( ; CHECK-NEXT: [[X_NEG:%.*]] = fneg nnan ninf nsz float [[X:%.*]] ; CHECK-NEXT: [[R:%.*]] = select nnan ninf nsz i1 [[B:%.*]], float [[X_NEG]], float [[Y:%.*]] ; CHECK-NEXT: ret float [[R]] ; %ny = fneg float %y %s = select nsz i1 %b, float %x, float %ny %r = fneg ninf nnan nsz float %s ret float %r } ; Special-case for propagating nsz: it's ok when selecting between an operand and its negation. define float @select_common_op_fneg_true(float %x, i1 %b) { ; CHECK-LABEL: @select_common_op_fneg_true( ; CHECK-NEXT: [[X_NEG:%.*]] = fneg nnan ninf nsz float [[X:%.*]] ; CHECK-NEXT: [[R:%.*]] = select nnan ninf nsz i1 [[B:%.*]], float [[X_NEG]], float [[X]] ; CHECK-NEXT: ret float [[R]] ; %nx = fneg float %x %s = select i1 %b, float %x, float %nx %r = fneg nsz ninf nnan float %s ret float %r } define float @select_common_op_fneg_false(float %x, i1 %b) { ; CHECK-LABEL: @select_common_op_fneg_false( ; CHECK-NEXT: [[X_NEG:%.*]] = fneg nnan ninf nsz float [[X:%.*]] ; CHECK-NEXT: [[R:%.*]] = select nnan ninf nsz i1 [[B:%.*]], float [[X_NEG]], float [[X]] ; CHECK-NEXT: ret float [[R]] ; %nx = fneg float %x %s = select i1 %b, float %x, float %nx %r = fneg nsz ninf nnan float %s ret float %r } ; The transform above allows follow-on folds to convert to fabs. define float @fabs(float %a) { ; CHECK-LABEL: @fabs( ; CHECK-NEXT: [[TMP1:%.*]] = call nnan ninf nsz float @llvm.fabs.f32(float [[A:%.*]]) ; CHECK-NEXT: ret float [[TMP1]] ; %fneg = fneg float %a %cmp = fcmp ogt float %a, %fneg %sel = select i1 %cmp, float %fneg, float %a %fneg1 = fneg nnan ninf nsz float %sel ret float %fneg1 } define float @fnabs(float %a) { ; CHECK-LABEL: @fnabs( ; CHECK-NEXT: [[TMP1:%.*]] = call fast float @llvm.fabs.f32(float [[A:%.*]]) ; CHECK-NEXT: [[FNEG1:%.*]] = fneg fast float [[TMP1]] ; CHECK-NEXT: ret float [[FNEG1]] ; %fneg = fneg float %a %cmp = fcmp olt float %a, %fneg %sel = select i1 %cmp, float %fneg, float %a %fneg1 = fneg fast float %sel ret float %fneg1 } define float @fnabs_1(float %a) { ; CHECK-LABEL: @fnabs_1( ; CHECK-NEXT: [[TMP1:%.*]] = call fast float @llvm.fabs.f32(float [[A:%.*]]) ; CHECK-NEXT: [[FNEG1:%.*]] = fneg fast float [[TMP1]] ; CHECK-NEXT: ret float [[FNEG1]] ; %fneg = fneg float %a %cmp = fcmp ogt float %a, %fneg %sel = select i1 %cmp, float %a, float %fneg %fneg1 = fneg fast float %sel ret float %fneg1 } define float @fnabs_2(float %a) { ; CHECK-LABEL: @fnabs_2( ; CHECK-NEXT: [[TMP1:%.*]] = call nsz float @llvm.fabs.f32(float [[A:%.*]]) ; CHECK-NEXT: [[FNEG1:%.*]] = fneg float [[TMP1]] ; CHECK-NEXT: ret float [[FNEG1]] ; %fneg = fneg float %a %cmp = fcmp olt float %a, %fneg %sel = select nsz i1 %cmp, float %fneg, float %a %fneg1 = fneg float %sel ret float %fneg1 } define float @select_fneg_both(float %x, float %y, i1 %b) { ; CHECK-LABEL: @select_fneg_both( ; CHECK-NEXT: [[S_V:%.*]] = select i1 [[B:%.*]], float [[X:%.*]], float [[Y:%.*]] ; CHECK-NEXT: ret float [[S_V]] ; %nx = fneg float %x %ny = fneg float %y %s = select i1 %b, float %nx, float %ny %r = fneg float %s ret float %r } define float @select_fneg_use1(float %x, float %y, i1 %b) { ; CHECK-LABEL: @select_fneg_use1( ; CHECK-NEXT: [[NX:%.*]] = fneg ninf float [[X:%.*]] ; CHECK-NEXT: call void @use(float [[NX]]) ; CHECK-NEXT: [[Y_NEG:%.*]] = fneg float [[Y:%.*]] ; CHECK-NEXT: [[R:%.*]] = select i1 [[B:%.*]], float [[X]], float [[Y_NEG]] ; CHECK-NEXT: ret float [[R]] ; %nx = fneg ninf float %x call void @use(float %nx) %s = select fast i1 %b, float %nx, float %y %r = fneg float %s ret float %r } define float @select_fneg_use2(float %x, float %y, i1 %b) { ; CHECK-LABEL: @select_fneg_use2( ; CHECK-NEXT: call void @use(float [[Y:%.*]]) ; CHECK-NEXT: [[Y_NEG:%.*]] = fneg fast float [[Y]] ; CHECK-NEXT: [[R:%.*]] = select reassoc nnan ninf arcp contract afn i1 [[B:%.*]], float [[X:%.*]], float [[Y_NEG]] ; CHECK-NEXT: ret float [[R]] ; call void @use(float %y) %nx = fneg nsz float %x %s = select ninf i1 %b, float %nx, float %y %r = fneg fast float %s ret float %r } ; Negative test define float @select_fneg_use3(float %x, float %y, i1 %b) { ; CHECK-LABEL: @select_fneg_use3( ; CHECK-NEXT: [[NX:%.*]] = fneg float [[X:%.*]] ; CHECK-NEXT: [[S:%.*]] = select i1 [[B:%.*]], float [[NX]], float [[Y:%.*]] ; CHECK-NEXT: call void @use(float [[S]]) ; CHECK-NEXT: [[R:%.*]] = fneg float [[S]] ; CHECK-NEXT: ret float [[R]] ; %nx = fneg float %x %s = select i1 %b, float %nx, float %y call void @use(float %s) %r = fneg float %s ret float %r }