derek.holloway
7502bf64a4
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51 lines
1.6 KiB
LLVM
51 lines
1.6 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 4
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; RUN: opt < %s -passes=instcombine -S | FileCheck %s
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declare double @erf(double)
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declare double @cos(double)
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declare double @fabs(double)
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declare void @use(double) nounwind
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; Check odd parity: -erf(-x) == erf(x)
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define double @test_erf(double %x) {
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; CHECK-LABEL: define double @test_erf(
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; CHECK-SAME: double [[X:%.*]]) {
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; CHECK-NEXT: [[RES:%.*]] = tail call reassoc double @erf(double [[X]])
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; CHECK-NEXT: ret double [[RES]]
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;
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%neg_x = fneg double %x
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%res = tail call reassoc double @erf(double %neg_x)
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%neg_res = fneg double %res
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ret double %neg_res
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}
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; Check even parity: cos(fabs(x)) == cos(x)
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define double @test_cos_fabs(double %x) {
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; CHECK-LABEL: define double @test_cos_fabs(
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; CHECK-SAME: double [[X:%.*]]) {
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; CHECK-NEXT: [[RES:%.*]] = tail call reassoc double @cos(double [[X]])
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; CHECK-NEXT: ret double [[RES]]
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;
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%fabs_res = call double @fabs(double %x)
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%res = tail call reassoc double @cos(double %fabs_res)
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ret double %res
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}
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; Do nothing in case of multi-use
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define double @test_erf_multi_use(double %x) {
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; CHECK-LABEL: define double @test_erf_multi_use(
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; CHECK-SAME: double [[X:%.*]]) {
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; CHECK-NEXT: [[NEG_X:%.*]] = fneg double [[X]]
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; CHECK-NEXT: call void @use(double [[NEG_X]])
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; CHECK-NEXT: [[RES:%.*]] = call double @erf(double [[NEG_X]])
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; CHECK-NEXT: [[NEG_RES:%.*]] = fneg double [[RES]]
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; CHECK-NEXT: ret double [[NEG_RES]]
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;
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%neg_x = fneg double %x
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call void @use(double %neg_x)
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%res = call double @erf(double %neg_x)
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%neg_res = fneg double %res
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ret double %neg_res
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}
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