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[InstCombine][test] add coverage for possible fabs folds; NFC 

This goes with D101727 (adds FMF to the select).

Differential Revision: https://reviews.llvm.org/D106563
This commit is contained in:
Krishna Kariya 2021-07-22 13:18:57 -04:00 committed by Sanjay Patel
parent 2542c1a5a1
commit ae4e8f7d52
1 changed files with 88 additions and 0 deletions
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88
llvm/test/Transforms/InstCombine/fabs.ll
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@ -278,6 +278,17 @@ define double @select_fcmp_nnan_ole_zero(double %x) {
ret double %fabs
}
define double @select_nnan_fcmp_nnan_ole_zero(double %x) {
; CHECK-LABEL: @select_nnan_fcmp_nnan_ole_zero(
; CHECK-NEXT: [[TMP1:%.*]] = call nnan double @llvm.fabs.f64(double [[X:%.*]])
; CHECK-NEXT: ret double [[TMP1]]
;
%lezero = fcmp ole double %x, 0.0
%negx = fsub nnan double 0.0, %x
%fabs = select nnan i1 %lezero, double %negx, double %x
ret double %fabs
}
; Repeat with unordered predicate - nnan allows us to treat ordered/unordered identically.
define double @select_fcmp_nnan_ule_zero(double %x) {
@ -319,6 +330,17 @@ define <2 x float> @select_fcmp_nnan_ole_negzero(<2 x float> %x) {
ret <2 x float> %fabs
}
define <2 x float> @select_nnan_fcmp_nnan_ole_negzero(<2 x float> %x) {
; CHECK-LABEL: @select_nnan_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 ole <2 x float> %x, <float -0.0, float -0.0>
%negx = fsub nnan <2 x float> <float 0.0, float undef>, %x
%fabs = select nnan <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) {
@ -332,6 +354,17 @@ define fp128 @select_fcmp_nnan_ogt_zero(fp128 %x) {
ret fp128 %fabs
}
define fp128 @select_nnan_fcmp_nnan_ogt_zero(fp128 %x) {
; CHECK-LABEL: @select_nnan_fcmp_nnan_ogt_zero(
; CHECK-NEXT: [[TMP1:%.*]] = call nnan fp128 @llvm.fabs.f128(fp128 [[X:%.*]])
; CHECK-NEXT: ret fp128 [[TMP1]]
;
%gtzero = fcmp ogt fp128 %x, zeroinitializer
%negx = fsub nnan fp128 zeroinitializer, %x
%fabs = select nnan 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) {
@ -345,6 +378,17 @@ define half @select_fcmp_nnan_ogt_negzero(half %x) {
ret half %fabs
}
define half @select_nnan_fcmp_nnan_ogt_negzero(half %x) {
; CHECK-LABEL: @select_nnan_fcmp_nnan_ogt_negzero(
; CHECK-NEXT: [[TMP1:%.*]] = call nnan half @llvm.fabs.f16(half [[X:%.*]])
; CHECK-NEXT: ret half [[TMP1]]
;
%gtzero = fcmp ogt half %x, -0.0
%negx = fsub nnan half 0.0, %x
%fabs = select nnan i1 %gtzero, half %x, half %negx
ret half %fabs
}
; Repeat with unordered predicate - nnan allows us to treat ordered/unordered identically.
define half @select_fcmp_nnan_ugt_negzero(half %x) {
@ -386,6 +430,17 @@ define double @select_fcmp_nnan_nsz_olt_zero(double %x) {
ret double %fabs
}
define double @select_nnan_nsz_fcmp_nnan_nsz_olt_zero(double %x) {
; CHECK-LABEL: @select_nnan_nsz_fcmp_nnan_nsz_olt_zero(
; CHECK-NEXT: [[TMP1:%.*]] = call nnan nsz double @llvm.fabs.f64(double [[X:%.*]])
; CHECK-NEXT: ret double [[TMP1]]
;
%ltzero = fcmp olt double %x, 0.0
%negx = fsub nnan nsz double -0.0, %x
%fabs = select nnan nsz i1 %ltzero, double %negx, double %x
ret double %fabs
}
; Repeat with unordered predicate - nnan allows us to treat ordered/unordered identically.
define double @select_fcmp_nnan_nsz_ult_zero(double %x) {
@ -436,6 +491,17 @@ define float @select_fcmp_nnan_nsz_olt_negzero(float %x) {
ret float %fabs
}
define float @select_nnan_ninf_nsz_fcmp_nnan_nsz_olt_negzero(float %x) {
; CHECK-LABEL: @select_nnan_ninf_nsz_fcmp_nnan_nsz_olt_negzero(
; CHECK-NEXT: [[TMP1:%.*]] = call nnan nsz float @llvm.fabs.f32(float [[X:%.*]])
; CHECK-NEXT: ret float [[TMP1]]
;
%ltzero = fcmp olt float %x, -0.0
%negx = fsub nnan nsz float -0.0, %x
%fabs = select nnan ninf nsz i1 %ltzero, float %negx, float %x
ret float %fabs
}
; Repeat with unordered predicate - nnan allows us to treat ordered/unordered identically.
define float @select_fcmp_nnan_nsz_ult_negzero(float %x) {
@ -486,6 +552,17 @@ define double @select_fcmp_nnan_nsz_ole_zero(double %x) {
ret double %fabs
}
define double @select_fast_fcmp_nnan_nsz_ole_zero(double %x) {
; CHECK-LABEL: @select_fast_fcmp_nnan_nsz_ole_zero(
; CHECK-NEXT: [[TMP1:%.*]] = call nnan nsz double @llvm.fabs.f64(double [[X:%.*]])
; CHECK-NEXT: ret double [[TMP1]]
;
%lezero = fcmp ole double %x, 0.0
%negx = fsub nnan nsz double -0.0, %x
%fabs = select fast i1 %lezero, double %negx, double %x
ret double %fabs
}
; Repeat with unordered predicate - nnan allows us to treat ordered/unordered identically.
define double @select_fcmp_nnan_nsz_ule_zero(double %x) {
@ -536,6 +613,17 @@ define float @select_fcmp_nnan_nsz_ole_negzero(float %x) {
ret float %fabs
}
define float @select_nnan_nsz_fcmp_nnan_nsz_ole_negzero(float %x) {
; CHECK-LABEL: @select_nnan_nsz_fcmp_nnan_nsz_ole_negzero(
; CHECK-NEXT: [[TMP1:%.*]] = call nnan nsz float @llvm.fabs.f32(float [[X:%.*]])
; CHECK-NEXT: ret float [[TMP1]]
;
%lezero = fcmp ole float %x, -0.0
%negx = fsub nnan nsz float -0.0, %x
%fabs = select nnan nsz i1 %lezero, float %negx, float %x
ret float %fabs
}
; Repeat with unordered predicate - nnan allows us to treat ordered/unordered identically.
define float @select_fcmp_nnan_nsz_ule_negzero(float %x) {