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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 4
; RUN: opt < %s -passes=instcombine -S | FileCheck %s
declare double @erf(double)
declare double @cos(double)
declare double @fabs(double)
declare void @use(double) nounwind
; Check odd parity: -erf(-x) == erf(x)
define double @test_erf(double %x) {
; CHECK-LABEL: define double @test_erf(
; CHECK-SAME: double [[X:%.*]]) {
; CHECK-NEXT: [[RES:%.*]] = tail call reassoc double @erf(double [[X]])
; CHECK-NEXT: ret double [[RES]]
;
%neg_x = fneg double %x
%res = tail call reassoc double @erf(double %neg_x)
%neg_res = fneg double %res
ret double %neg_res
}
; Check even parity: cos(fabs(x)) == cos(x)
define double @test_cos_fabs(double %x) {
; CHECK-LABEL: define double @test_cos_fabs(
; CHECK-SAME: double [[X:%.*]]) {
; CHECK-NEXT: [[RES:%.*]] = tail call reassoc double @cos(double [[X]])
; CHECK-NEXT: ret double [[RES]]
;
%fabs_res = call double @fabs(double %x)
%res = tail call reassoc double @cos(double %fabs_res)
ret double %res
}
; Do nothing in case of multi-use
define double @test_erf_multi_use(double %x) {
; CHECK-LABEL: define double @test_erf_multi_use(
; CHECK-SAME: double [[X:%.*]]) {
; CHECK-NEXT: [[NEG_X:%.*]] = fneg double [[X]]
; CHECK-NEXT: call void @use(double [[NEG_X]])
; CHECK-NEXT: [[RES:%.*]] = call double @erf(double [[NEG_X]])
; CHECK-NEXT: [[NEG_RES:%.*]] = fneg double [[RES]]
; CHECK-NEXT: ret double [[NEG_RES]]
;
%neg_x = fneg double %x
call void @use(double %neg_x)
%res = call double @erf(double %neg_x)
%neg_res = fneg double %res
ret double %neg_res
}
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