diff options
Diffstat (limited to 'llvm/test/Transforms/InstCombine/fabs.ll')
| -rw-r--r-- | llvm/test/Transforms/InstCombine/fabs.ll | 420 |
1 files changed, 420 insertions, 0 deletions
diff --git a/llvm/test/Transforms/InstCombine/fabs.ll b/llvm/test/Transforms/InstCombine/fabs.ll new file mode 100644 index 00000000000..2dcdc52210a --- /dev/null +++ b/llvm/test/Transforms/InstCombine/fabs.ll @@ -0,0 +1,420 @@ +; NOTE: Assertions have been autogenerated by utils/update_test_checks.py +; RUN: opt -mtriple=x86_64-unknown-linux-gnu < %s -instcombine -S | FileCheck %s + +; Make sure libcalls are replaced with intrinsic calls. + +declare float @llvm.fabs.f32(float) +declare double @llvm.fabs.f64(double) +declare fp128 @llvm.fabs.f128(fp128) + +declare float @fabsf(float) +declare double @fabs(double) +declare fp128 @fabsl(fp128) +declare float @llvm.fma.f32(float, float, float) +declare float @llvm.fmuladd.f32(float, float, float) + +define float @replace_fabs_call_f32(float %x) { +; CHECK-LABEL: @replace_fabs_call_f32( +; CHECK-NEXT: [[FABSF:%.*]] = call float @llvm.fabs.f32(float [[X:%.*]]) +; CHECK-NEXT: ret float [[FABSF]] +; + %fabsf = tail call float @fabsf(float %x) + ret float %fabsf +} + +define double @replace_fabs_call_f64(double %x) { +; CHECK-LABEL: @replace_fabs_call_f64( +; CHECK-NEXT: [[FABS:%.*]] = call double @llvm.fabs.f64(double [[X:%.*]]) +; CHECK-NEXT: ret double [[FABS]] +; + %fabs = tail call double @fabs(double %x) + ret double %fabs +} + +define fp128 @replace_fabs_call_f128(fp128 %x) { +; CHECK-LABEL: @replace_fabs_call_f128( +; CHECK-NEXT: [[FABSL:%.*]] = call fp128 @llvm.fabs.f128(fp128 [[X:%.*]]) +; CHECK-NEXT: ret fp128 [[FABSL]] +; + %fabsl = tail call fp128 @fabsl(fp128 %x) + ret fp128 %fabsl +} + +; Make sure fast math flags are preserved when replacing the libcall. +define float @fmf_replace_fabs_call_f32(float %x) { +; CHECK-LABEL: @fmf_replace_fabs_call_f32( +; CHECK-NEXT: [[FABSF:%.*]] = call nnan float @llvm.fabs.f32(float [[X:%.*]]) +; CHECK-NEXT: ret float [[FABSF]] +; + %fabsf = tail call nnan float @fabsf(float %x) + ret float %fabsf +} + +; Make sure all intrinsic calls are eliminated when the input is known +; positive. + +; The fabs cannot be eliminated because %x may be a NaN + +define float @square_fabs_intrinsic_f32(float %x) { +; CHECK-LABEL: @square_fabs_intrinsic_f32( +; CHECK-NEXT: [[MUL:%.*]] = fmul float [[X:%.*]], [[X]] +; CHECK-NEXT: [[FABSF:%.*]] = tail call float @llvm.fabs.f32(float [[MUL]]) +; CHECK-NEXT: ret float [[FABSF]] +; + %mul = fmul float %x, %x + %fabsf = tail call float @llvm.fabs.f32(float %mul) + ret float %fabsf +} + +define double @square_fabs_intrinsic_f64(double %x) { +; CHECK-LABEL: @square_fabs_intrinsic_f64( +; CHECK-NEXT: [[MUL:%.*]] = fmul double [[X:%.*]], [[X]] +; CHECK-NEXT: [[FABS:%.*]] = tail call double @llvm.fabs.f64(double [[MUL]]) +; CHECK-NEXT: ret double [[FABS]] +; + %mul = fmul double %x, %x + %fabs = tail call double @llvm.fabs.f64(double %mul) + ret double %fabs +} + +define fp128 @square_fabs_intrinsic_f128(fp128 %x) { +; CHECK-LABEL: @square_fabs_intrinsic_f128( +; CHECK-NEXT: [[MUL:%.*]] = fmul fp128 [[X:%.*]], [[X]] +; CHECK-NEXT: [[FABSL:%.*]] = tail call fp128 @llvm.fabs.f128(fp128 [[MUL]]) +; CHECK-NEXT: ret fp128 [[FABSL]] +; + %mul = fmul fp128 %x, %x + %fabsl = tail call fp128 @llvm.fabs.f128(fp128 %mul) + ret fp128 %fabsl +} + +define float @square_nnan_fabs_intrinsic_f32(float %x) { +; CHECK-LABEL: @square_nnan_fabs_intrinsic_f32( +; CHECK-NEXT: [[MUL:%.*]] = fmul nnan float [[X:%.*]], [[X]] +; CHECK-NEXT: ret float [[MUL]] +; + %mul = fmul nnan float %x, %x + %fabsf = call float @llvm.fabs.f32(float %mul) + ret float %fabsf +} + +; Shrinking a library call to a smaller type should not be inhibited by nor inhibit the square optimization. + +define float @square_fabs_shrink_call1(float %x) { +; CHECK-LABEL: @square_fabs_shrink_call1( +; CHECK-NEXT: [[TMP1:%.*]] = fmul float [[X:%.*]], [[X]] +; CHECK-NEXT: [[TRUNC:%.*]] = call float @llvm.fabs.f32(float [[TMP1]]) +; CHECK-NEXT: ret float [[TRUNC]] +; + %ext = fpext float %x to double + %sq = fmul double %ext, %ext + %fabs = call double @fabs(double %sq) + %trunc = fptrunc double %fabs to float + ret float %trunc +} + +define float @square_fabs_shrink_call2(float %x) { +; CHECK-LABEL: @square_fabs_shrink_call2( +; CHECK-NEXT: [[SQ:%.*]] = fmul float [[X:%.*]], [[X]] +; CHECK-NEXT: [[TRUNC:%.*]] = call float @llvm.fabs.f32(float [[SQ]]) +; CHECK-NEXT: ret float [[TRUNC]] +; + %sq = fmul float %x, %x + %ext = fpext float %sq to double + %fabs = call double @fabs(double %ext) + %trunc = fptrunc double %fabs to float + ret float %trunc +} + +define float @fabs_select_constant_negative_positive(i32 %c) { +; CHECK-LABEL: @fabs_select_constant_negative_positive( +; CHECK-NEXT: [[CMP:%.*]] = icmp eq i32 [[C:%.*]], 0 +; CHECK-NEXT: [[FABS:%.*]] = select i1 [[CMP]], float 1.000000e+00, float 2.000000e+00 +; CHECK-NEXT: ret float [[FABS]] +; + %cmp = icmp eq i32 %c, 0 + %select = select i1 %cmp, float -1.0, float 2.0 + %fabs = call float @llvm.fabs.f32(float %select) + ret float %fabs +} + +define float @fabs_select_constant_positive_negative(i32 %c) { +; CHECK-LABEL: @fabs_select_constant_positive_negative( +; CHECK-NEXT: [[CMP:%.*]] = icmp eq i32 [[C:%.*]], 0 +; CHECK-NEXT: [[FABS:%.*]] = select i1 [[CMP]], float 1.000000e+00, float 2.000000e+00 +; CHECK-NEXT: ret float [[FABS]] +; + %cmp = icmp eq i32 %c, 0 + %select = select i1 %cmp, float 1.0, float -2.0 + %fabs = call float @llvm.fabs.f32(float %select) + ret float %fabs +} + +define float @fabs_select_constant_negative_negative(i32 %c) { +; CHECK-LABEL: @fabs_select_constant_negative_negative( +; CHECK-NEXT: [[CMP:%.*]] = icmp eq i32 [[C:%.*]], 0 +; CHECK-NEXT: [[FABS:%.*]] = select i1 [[CMP]], float 1.000000e+00, float 2.000000e+00 +; CHECK-NEXT: ret float [[FABS]] +; + %cmp = icmp eq i32 %c, 0 + %select = select i1 %cmp, float -1.0, float -2.0 + %fabs = call float @llvm.fabs.f32(float %select) + ret float %fabs +} + +define float @fabs_select_constant_neg0(i32 %c) { +; CHECK-LABEL: @fabs_select_constant_neg0( +; CHECK-NEXT: ret float 0.000000e+00 +; + %cmp = icmp eq i32 %c, 0 + %select = select i1 %cmp, float -0.0, float 0.0 + %fabs = call float @llvm.fabs.f32(float %select) + ret float %fabs +} + +define float @fabs_select_var_constant_negative(i32 %c, float %x) { +; CHECK-LABEL: @fabs_select_var_constant_negative( +; CHECK-NEXT: [[CMP:%.*]] = icmp eq i32 [[C:%.*]], 0 +; CHECK-NEXT: [[SELECT:%.*]] = select i1 [[CMP]], float [[X:%.*]], float -1.000000e+00 +; CHECK-NEXT: [[FABS:%.*]] = call float @llvm.fabs.f32(float [[SELECT]]) +; CHECK-NEXT: ret float [[FABS]] +; + %cmp = icmp eq i32 %c, 0 + %select = select i1 %cmp, float %x, float -1.0 + %fabs = call float @llvm.fabs.f32(float %select) + ret float %fabs +} + +; The fabs cannot be eliminated because %x may be a NaN + +define float @square_fma_fabs_intrinsic_f32(float %x) { +; CHECK-LABEL: @square_fma_fabs_intrinsic_f32( +; CHECK-NEXT: [[FMA:%.*]] = call float @llvm.fma.f32(float [[X:%.*]], float [[X]], float 1.000000e+00) +; CHECK-NEXT: [[FABSF:%.*]] = call float @llvm.fabs.f32(float [[FMA]]) +; CHECK-NEXT: ret float [[FABSF]] +; + %fma = call float @llvm.fma.f32(float %x, float %x, float 1.0) + %fabsf = call float @llvm.fabs.f32(float %fma) + ret float %fabsf +} + +; The fabs cannot be eliminated because %x may be a NaN + +define float @square_nnan_fma_fabs_intrinsic_f32(float %x) { +; CHECK-LABEL: @square_nnan_fma_fabs_intrinsic_f32( +; CHECK-NEXT: [[FMA:%.*]] = call nnan float @llvm.fma.f32(float [[X:%.*]], float [[X]], float 1.000000e+00) +; CHECK-NEXT: ret float [[FMA]] +; + %fma = call nnan float @llvm.fma.f32(float %x, float %x, float 1.0) + %fabsf = call float @llvm.fabs.f32(float %fma) + ret float %fabsf +} + +define float @square_fmuladd_fabs_intrinsic_f32(float %x) { +; CHECK-LABEL: @square_fmuladd_fabs_intrinsic_f32( +; CHECK-NEXT: [[FMULADD:%.*]] = call float @llvm.fmuladd.f32(float [[X:%.*]], float [[X]], float 1.000000e+00) +; CHECK-NEXT: [[FABSF:%.*]] = call float @llvm.fabs.f32(float [[FMULADD]]) +; CHECK-NEXT: ret float [[FABSF]] +; + %fmuladd = call float @llvm.fmuladd.f32(float %x, float %x, float 1.0) + %fabsf = call float @llvm.fabs.f32(float %fmuladd) + ret float %fabsf +} + +define float @square_nnan_fmuladd_fabs_intrinsic_f32(float %x) { +; CHECK-LABEL: @square_nnan_fmuladd_fabs_intrinsic_f32( +; CHECK-NEXT: [[FMULADD:%.*]] = call nnan float @llvm.fmuladd.f32(float [[X:%.*]], float [[X]], float 1.000000e+00) +; CHECK-NEXT: ret float [[FMULADD]] +; + %fmuladd = call nnan float @llvm.fmuladd.f32(float %x, float %x, float 1.0) + %fabsf = call float @llvm.fabs.f32(float %fmuladd) + ret float %fabsf +} + +; Don't introduce a second fpext + +define double @multi_use_fabs_fpext(float %x) { +; CHECK-LABEL: @multi_use_fabs_fpext( +; CHECK-NEXT: [[FPEXT:%.*]] = fpext float [[X:%.*]] to double +; CHECK-NEXT: [[FABS:%.*]] = call double @llvm.fabs.f64(double [[FPEXT]]) +; CHECK-NEXT: store volatile double [[FPEXT]], double* undef, align 8 +; CHECK-NEXT: ret double [[FABS]] +; + %fpext = fpext float %x to double + %fabs = call double @llvm.fabs.f64(double %fpext) + store volatile double %fpext, double* undef + ret double %fabs +} + +; Negative test for the fabs folds below: we require nnan, so +; we won't always clear the sign bit of a NaN value. + +define double @select_fcmp_ole_zero(double %x) { +; CHECK-LABEL: @select_fcmp_ole_zero( +; CHECK-NEXT: [[LEZERO:%.*]] = fcmp ole double [[X:%.*]], 0.000000e+00 +; CHECK-NEXT: [[NEGX:%.*]] = fsub double 0.000000e+00, [[X]] +; CHECK-NEXT: [[FABS:%.*]] = select i1 [[LEZERO]], double [[NEGX]], double [[X]] +; CHECK-NEXT: ret double [[FABS]] +; + %lezero = fcmp ole double %x, 0.0 + %negx = fsub double 0.0, %x + %fabs = select i1 %lezero, double %negx, double %x + ret double %fabs +} + +; X <= 0.0 ? (0.0 - X) : X --> fabs(X) + +define double @select_fcmp_nnan_ole_zero(double %x) { +; CHECK-LABEL: @select_fcmp_nnan_ole_zero( +; CHECK-NEXT: [[TMP1:%.*]] = call nnan double @llvm.fabs.f64(double [[X:%.*]]) +; CHECK-NEXT: ret double [[TMP1]] +; + %lezero = fcmp nnan ole double %x, 0.0 + %negx = fsub double 0.0, %x + %fabs = select i1 %lezero, double %negx, double %x + ret double %fabs +} + +; X <= -0.0 ? (0.0 - X) : X --> fabs(X) + +define <2 x float> @select_fcmp_nnan_ole_negzero(<2 x float> %x) { +; CHECK-LABEL: @select_fcmp_nnan_ole_negzero( +; CHECK-NEXT: [[TMP1:%.*]] = call nnan <2 x float> @llvm.fabs.v2f32(<2 x float> [[X:%.*]]) +; CHECK-NEXT: ret <2 x float> [[TMP1]] +; + %lezero = fcmp nnan ole <2 x float> %x, <float -0.0, float -0.0> + %negx = fsub <2 x float> <float 0.0, float undef>, %x + %fabs = select <2 x i1> %lezero, <2 x float> %negx, <2 x float> %x + ret <2 x float> %fabs +} + +; X > 0.0 ? X : (0.0 - X) --> fabs(X) + +define fp128 @select_fcmp_nnan_ogt_zero(fp128 %x) { +; CHECK-LABEL: @select_fcmp_nnan_ogt_zero( +; CHECK-NEXT: [[TMP1:%.*]] = call nnan fp128 @llvm.fabs.f128(fp128 [[X:%.*]]) +; CHECK-NEXT: ret fp128 [[TMP1]] +; + %gtzero = fcmp nnan ogt fp128 %x, zeroinitializer + %negx = fsub fp128 zeroinitializer, %x + %fabs = select i1 %gtzero, fp128 %x, fp128 %negx + ret fp128 %fabs +} + +; X > -0.0 ? X : (0.0 - X) --> fabs(X) + +define half @select_fcmp_nnan_ogt_negzero(half %x) { +; CHECK-LABEL: @select_fcmp_nnan_ogt_negzero( +; CHECK-NEXT: [[TMP1:%.*]] = call nnan half @llvm.fabs.f16(half [[X:%.*]]) +; CHECK-NEXT: ret half [[TMP1]] +; + %gtzero = fcmp nnan ogt half %x, -0.0 + %negx = fsub half 0.0, %x + %fabs = select i1 %gtzero, half %x, half %negx + ret half %fabs +} + +; X < 0.0 ? -X : X --> fabs(X) + +define double @select_fcmp_nnan_nsz_olt_zero(double %x) { +; CHECK-LABEL: @select_fcmp_nnan_nsz_olt_zero( +; CHECK-NEXT: [[TMP1:%.*]] = call nnan nsz double @llvm.fabs.f64(double [[X:%.*]]) +; CHECK-NEXT: ret double [[TMP1]] +; + %ltzero = fcmp nnan nsz olt double %x, 0.0 + %negx = fsub double -0.0, %x + %fabs = select i1 %ltzero, double %negx, double %x + ret double %fabs +} + +; X < -0.0 ? -X : X --> fabs(X) + +define float @select_fcmp_nnan_nsz_olt_negzero(float %x) { +; CHECK-LABEL: @select_fcmp_nnan_nsz_olt_negzero( +; CHECK-NEXT: [[TMP1:%.*]] = call nnan ninf nsz float @llvm.fabs.f32(float [[X:%.*]]) +; CHECK-NEXT: ret float [[TMP1]] +; + %ltzero = fcmp nnan nsz ninf olt float %x, -0.0 + %negx = fsub float -0.0, %x + %fabs = select i1 %ltzero, float %negx, float %x + ret float %fabs +} + +; X <= 0.0 ? -X : X --> fabs(X) + +define double @select_fcmp_nnan_nsz_ole_zero(double %x) { +; CHECK-LABEL: @select_fcmp_nnan_nsz_ole_zero( +; CHECK-NEXT: [[TMP1:%.*]] = call fast double @llvm.fabs.f64(double [[X:%.*]]) +; CHECK-NEXT: ret double [[TMP1]] +; + %lezero = fcmp fast ole double %x, 0.0 + %negx = fsub double -0.0, %x + %fabs = select i1 %lezero, double %negx, double %x + ret double %fabs +} + +; X <= -0.0 ? -X : X --> fabs(X) + +define float @select_fcmp_nnan_nsz_ole_negzero(float %x) { +; CHECK-LABEL: @select_fcmp_nnan_nsz_ole_negzero( +; CHECK-NEXT: [[TMP1:%.*]] = call nnan nsz float @llvm.fabs.f32(float [[X:%.*]]) +; CHECK-NEXT: ret float [[TMP1]] +; + %lezero = fcmp nnan nsz ole float %x, -0.0 + %negx = fsub float -0.0, %x + %fabs = select i1 %lezero, float %negx, float %x + ret float %fabs +} + +; X > 0.0 ? X : (0.0 - X) --> fabs(X) + +define <2 x float> @select_fcmp_nnan_nsz_ogt_zero(<2 x float> %x) { +; CHECK-LABEL: @select_fcmp_nnan_nsz_ogt_zero( +; CHECK-NEXT: [[TMP1:%.*]] = call nnan nsz arcp <2 x float> @llvm.fabs.v2f32(<2 x float> [[X:%.*]]) +; CHECK-NEXT: ret <2 x float> [[TMP1]] +; + %gtzero = fcmp nnan nsz arcp ogt <2 x float> %x, zeroinitializer + %negx = fsub <2 x float> <float -0.0, float -0.0>, %x + %fabs = select <2 x i1> %gtzero, <2 x float> %x, <2 x float> %negx + ret <2 x float> %fabs +} + +; X > -0.0 ? X : (0.0 - X) --> fabs(X) + +define half @select_fcmp_nnan_nsz_ogt_negzero(half %x) { +; CHECK-LABEL: @select_fcmp_nnan_nsz_ogt_negzero( +; CHECK-NEXT: [[TMP1:%.*]] = call fast half @llvm.fabs.f16(half [[X:%.*]]) +; CHECK-NEXT: ret half [[TMP1]] +; + %gtzero = fcmp fast ogt half %x, -0.0 + %negx = fsub half 0.0, %x + %fabs = select i1 %gtzero, half %x, half %negx + ret half %fabs +} + +; X > 0.0 ? X : (0.0 - X) --> fabs(X) + +define <2 x double> @select_fcmp_nnan_nsz_oge_zero(<2 x double> %x) { +; CHECK-LABEL: @select_fcmp_nnan_nsz_oge_zero( +; CHECK-NEXT: [[TMP1:%.*]] = call reassoc nnan nsz <2 x double> @llvm.fabs.v2f64(<2 x double> [[X:%.*]]) +; CHECK-NEXT: ret <2 x double> [[TMP1]] +; + %gezero = fcmp nnan nsz reassoc oge <2 x double> %x, zeroinitializer + %negx = fsub <2 x double> <double -0.0, double -0.0>, %x + %fabs = select <2 x i1> %gezero, <2 x double> %x, <2 x double> %negx + ret <2 x double> %fabs +} + +; X > -0.0 ? X : (0.0 - X) --> fabs(X) + +define half @select_fcmp_nnan_nsz_oge_negzero(half %x) { +; CHECK-LABEL: @select_fcmp_nnan_nsz_oge_negzero( +; CHECK-NEXT: [[TMP1:%.*]] = call nnan nsz half @llvm.fabs.f16(half [[X:%.*]]) +; CHECK-NEXT: ret half [[TMP1]] +; + %gezero = fcmp nnan nsz oge half %x, -0.0 + %negx = fsub half -0.0, %x + %fabs = select i1 %gezero, half %x, half %negx + ret half %fabs +} + |
