[AArch64] add fabs tests for PR36600; NFC

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@327995 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/test/CodeGen/AArch64/fabs.ll b/test/CodeGen/AArch64/fabs.ll
new file mode 100644 (file)
index 0000000..0508fdd
--- /dev/null
+++ b/test/CodeGen/AArch64/fabs.ll
@@ -0,0 +1,33 @@
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
+; RUN: llc < %s -mtriple=aarch64-unknown-unknown | FileCheck %s
+
+; FIXME:
+; PR36600: https://bugs.llvm.org/show_bug.cgi?id=36600
+; This is not fabs. If X = -0.0, it should return -0.0 not 0.0.
+
+define double @not_fabs(double %x) #0 {
+; CHECK-LABEL: not_fabs:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    fabs d0, d0
+; CHECK-NEXT:    ret
+  %cmp = fcmp nnan ole double %x, 0.0
+  %sub = fsub nnan double -0.0, %x
+  %cond = select i1 %cmp, double %sub, double %x
+  ret double %cond
+}
+
+; Try again with different type, predicate, and compare constant.
+
+define float @still_not_fabs(float %x) #0 {
+; CHECK-LABEL: still_not_fabs:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    fabs s0, s0
+; CHECK-NEXT:    ret
+  %cmp = fcmp nnan oge float %x, -0.0
+  %sub = fsub nnan float -0.0, %x
+  %cond = select i1 %cmp, float %x, float %sub
+  ret float %cond
+}
+
+attributes #0 = { "no-nans-fp-math"="true" }
+