instcombine: Migrate math library call simplifications

This patch migrates the math library call simplifications from the
simplify-libcalls pass into the instcombine library call simplifier.

I have typically migrated just one simplifier at a time, but the math
simplifiers are interdependent because:

   1. CosOpt, PowOpt, and Exp2Opt all depend on UnaryDoubleFPOpt.
   2. CosOpt, PowOpt, Exp2Opt, and UnaryDoubleFPOpt all depend on
      the option -enable-double-float-shrink.

These two factors made migrating each of these simplifiers individually
more of a pain than it would be worth.  So, I migrated them all together.

llvm-svn: 167815

1 files changed, 17 insertions, 0 deletions

diff --git a/llvm/test/Transforms/InstCombine/cos-2.ll b/llvm/test/Transforms/InstCombine/cos-2.ll
new file mode 100644
index 00000000000..2f2dfafe484
--- /dev/null
+++ b/llvm/test/Transforms/InstCombine/cos-2.ll
@@ -0,0 +1,17 @@
+; Test that the cos library call simplifier works correctly.
+;
+; RUN: opt < %s -instcombine -S | FileCheck %s
+
+target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128"
+
+declare float @cos(double)
+
+; Check that cos functions with the wrong prototype aren't simplified.
+
+define float @test_no_simplify1(double %d) {
+; CHECK: @test_no_simplify1
+  %neg = fsub double -0.000000e+00, %d
+  %cos = call float @cos(double %neg)
+; CHECK: call float @cos(double %neg)
+  ret float %cos
+}