test/Transforms/PhaseOrdering/generate-fabs.ll

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 5
; RUN: opt -passes='default<O1>' -S < %s | FileCheck %s

; Following test must generate fabs intrinsic. It goes through following stages
; 1. SROA propagates the nsz function attribute on the phi node.
; 2. SimplifyCFG pass converts phi node to select.
; 3. InstCombine converts select with nsz flag into fabs intrinsic.

define double @fabs_fcmp_olt_nsz_func_attr(double %0, double %1) "no-signed-zeros-fp-math"="true" {
; CHECK-LABEL: define double @fabs_fcmp_olt_nsz_func_attr(
; CHECK-SAME: double [[TMP0:%.*]], double [[TMP1:%.*]]) local_unnamed_addr #[[ATTR0:[0-9]+]] {
; CHECK-NEXT:  [[ENTRY:.*:]]
; CHECK-NEXT:    [[X_0:%.*]] = tail call nnan nsz double @llvm.fabs.f64(double [[TMP0]])
; CHECK-NEXT:    ret double [[X_0]]
entry:
  %x = alloca double
  store	double %0, ptr %x
  %cmp = fcmp nnan nsz olt double %0, 0.000000e+00
  br i1 %cmp, label %if.then, label %return

if.then:                         ; preds = %entry
  %fneg = fneg nnan nsz double %0
  store double %fneg, ptr %x
  br label %return

return:                          ; preds = %entry, %if.then
  %ret = load double, ptr %x
  ret double %ret
}