From f51a22e815a7494cbe1aba25d275015a70b5c31d Mon Sep 17 00:00:00 2001
From: Justin Holewinski <jholewinski@nvidia.com>
Date: Fri, 28 Jun 2013 17:58:13 +0000
Subject: [NVPTX] Add (1.0 / sqrt(x)) => rsqrt(x) generation when allowable by
 FP flags

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@185178 91177308-0d34-0410-b5e6-96231b3b80d8
---
 test/CodeGen/NVPTX/rsqrt.ll | 13 +++++++++++++
 1 file changed, 13 insertions(+)
 create mode 100644 test/CodeGen/NVPTX/rsqrt.ll

(limited to 'test/CodeGen/NVPTX')

diff --git a/test/CodeGen/NVPTX/rsqrt.ll b/test/CodeGen/NVPTX/rsqrt.ll
new file mode 100644
index 0000000..d49eebe
--- /dev/null
+++ b/test/CodeGen/NVPTX/rsqrt.ll
@@ -0,0 +1,13 @@
+; RUN: llc < %s -march=nvptx -mcpu=sm_20 -nvptx-prec-divf32=1 -nvptx-prec-sqrtf32=0 | FileCheck %s
+
+target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v16:16:16-v32:32:32-v64:64:64-v128:128:128-n16:32:64"
+
+declare float @llvm.nvvm.sqrt.f(float)
+
+define float @foo(float %a) {
+; CHECK: rsqrt.approx.f32
+  %val = tail call float @llvm.nvvm.sqrt.f(float %a)
+  %ret = fdiv float 1.0, %val
+  ret float %ret
+}
+  
\ No newline at end of file
-- 
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