1; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 4 2; RUN: opt < %s -passes=instcombine -S | FileCheck %s 3 4declare double @erf(double) 5declare double @cos(double) 6declare double @fabs(double) 7 8declare void @use(double) nounwind 9 10; Check odd parity: -erf(-x) == erf(x) 11define double @test_erf(double %x) { 12; CHECK-LABEL: define double @test_erf( 13; CHECK-SAME: double [[X:%.*]]) { 14; CHECK-NEXT: [[RES:%.*]] = tail call reassoc double @erf(double [[X]]) 15; CHECK-NEXT: ret double [[RES]] 16; 17 %neg_x = fneg double %x 18 %res = tail call reassoc double @erf(double %neg_x) 19 %neg_res = fneg double %res 20 ret double %neg_res 21} 22 23; Check even parity: cos(fabs(x)) == cos(x) 24define double @test_cos_fabs(double %x) { 25; CHECK-LABEL: define double @test_cos_fabs( 26; CHECK-SAME: double [[X:%.*]]) { 27; CHECK-NEXT: [[RES:%.*]] = tail call reassoc double @cos(double [[X]]) 28; CHECK-NEXT: ret double [[RES]] 29; 30 %fabs_res = call double @fabs(double %x) 31 %res = tail call reassoc double @cos(double %fabs_res) 32 ret double %res 33} 34 35; Do nothing in case of multi-use 36define double @test_erf_multi_use(double %x) { 37; CHECK-LABEL: define double @test_erf_multi_use( 38; CHECK-SAME: double [[X:%.*]]) { 39; CHECK-NEXT: [[NEG_X:%.*]] = fneg double [[X]] 40; CHECK-NEXT: call void @use(double [[NEG_X]]) 41; CHECK-NEXT: [[RES:%.*]] = call double @erf(double [[NEG_X]]) 42; CHECK-NEXT: [[NEG_RES:%.*]] = fneg double [[RES]] 43; CHECK-NEXT: ret double [[NEG_RES]] 44; 45 %neg_x = fneg double %x 46 call void @use(double %neg_x) 47 %res = call double @erf(double %neg_x) 48 %neg_res = fneg double %res 49 ret double %neg_res 50} 51