vendor/llvm/llvm-release_33-r183502

1 files changed, 38 insertions, 0 deletions

diff --git a/test/CodeGen/SystemZ/fp-neg-01.ll b/test/CodeGen/SystemZ/fp-neg-01.ll
new file mode 100644
index 000000000000..09a4a53e41d1
--- /dev/null
+++ b/test/CodeGen/SystemZ/fp-neg-01.ll
@@ -0,0 +1,38 @@
+; Test floating-point negation.
+;
+; RUN: llc < %s -mtriple=s390x-linux-gnu | FileCheck %s
+
+; Test f32.
+define float @f1(float %f) {
+; CHECK: f1:
+; CHECK: lcebr %f0, %f0
+; CHECK: br %r14
+  %res = fsub float -0.0, %f
+  ret float %res
+}
+
+; Test f64.
+define double @f2(double %f) {
+; CHECK: f2:
+; CHECK: lcdbr %f0, %f0
+; CHECK: br %r14
+  %res = fsub double -0.0, %f
+  ret double %res
+}
+
+; Test f128.  With the loads and stores, a pure negation would probably
+; be better implemented using an XI on the upper byte.  Do some extra
+; processing so that using FPRs is unequivocally better.
+define void @f3(fp128 *%ptr, fp128 *%ptr2) {
+; CHECK: f3:
+; CHECK: lcxbr
+; CHECK: dxbr
+; CHECK: br %r14
+  %orig = load fp128 *%ptr
+  %negzero = fpext float -0.0 to fp128
+  %neg = fsub fp128 0xL00000000000000008000000000000000, %orig
+  %op2 = load fp128 *%ptr2
+  %res = fdiv fp128 %neg, %op2
+  store fp128 %res, fp128 *%ptr
+  ret void
+}