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Fast-math test for SimplifyInstruction: fold multiply by 0 

llvm-svn: 168649
This commit is contained in:
Michael Ilseman 2012-11-27 00:47:20 +00:00
parent be9137a5c5
commit 16db61238d
1 changed files with 55 additions and 0 deletions
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55
llvm/0007-Fast-math-test-for-SimplifyInstruction-fold-multiply.patch Normal file
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@ -0,0 +1,55 @@
From a3d62a84e2805fc54fe721610de350cf23469aa4 Mon Sep 17 00:00:00 2001
From: Michael Ilseman <milseman@apple.com>
Date: Thu, 15 Nov 2012 10:04:58 -0800
Subject: [PATCH 7/8] Fast-math test for SimplifyInstruction: fold multiply by
0
---
test/Transforms/InstSimplify/fast-math.ll | 35 +++++++++++++++++++++++++++++++
1 file changed, 35 insertions(+)
create mode 100644 test/Transforms/InstSimplify/fast-math.ll
diff --git a/test/Transforms/InstSimplify/fast-math.ll b/test/Transforms/InstSimplify/fast-math.ll
new file mode 100644
index 0000000..e4b3ea3
--- /dev/null
+++ b/test/Transforms/InstSimplify/fast-math.ll
@@ -0,0 +1,35 @@
+; RUN: opt < %s -instsimplify -S | FileCheck %s
+
+;; x * 0 ==> 0 when no-nans and no-signed-zero
+; CHECK: mul_zero_1
+define float @mul_zero_1(float %a) {
+ %b = fmul nsz nnan float %a, 0.0
+; CHECK: ret float 0.0
+ ret float %b
+}
+; CHECK: mul_zero_2
+define float @mul_zero_2(float %a) {
+ %b = fmul fast float 0.0, %a
+; CHECK: ret float 0.0
+ ret float %b
+}
+
+;; x * 0 =/=> 0 when there could be nans or -0
+; CHECK: no_mul_zero_1
+define float @no_mul_zero_1(float %a) {
+ %b = fmul nsz float %a, 0.0
+; CHECK: ret float %b
+ ret float %b
+}
+; CHECK: no_mul_zero_2
+define float @no_mul_zero_2(float %a) {
+ %b = fmul nnan float %a, 0.0
+; CHECK: ret float %b
+ ret float %b
+}
+; CHECK: no_mul_zero_3
+define float @no_mul_zero_3(float %a) {
+ %b = fmul float %a, 0.0
+; CHECK: ret float %b
+ ret float %b
+}
--
1.7.12.2 (Apple Git-36)