Revert "Temporarily Revert "Add basic loop fusion pass.""

The reversion apparently deleted the test/Transforms directory.

Will be re-reverting again.

llvm-svn: 358552

1 files changed, 33 insertions, 0 deletions

diff --git a/llvm/test/Transforms/InstCombine/no-negzero.ll b/llvm/test/Transforms/InstCombine/no-negzero.ll
new file mode 100644
index 00000000000..07e68251b5a
--- /dev/null
+++ b/llvm/test/Transforms/InstCombine/no-negzero.ll
@@ -0,0 +1,33 @@
+; RUN: opt < %s -instcombine -S | FileCheck %s
+; ModuleID = '3555a.c'
+; sqrt(fabs) cannot be negative zero, so we should eliminate the fadd.
+target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128"
+target triple = "i386-apple-darwin9.8"
+
+; CHECK-LABEL: @mysqrt(
+; CHECK-NOT: fadd
+; CHECK: ret
+define double @mysqrt(double %x) nounwind {
+entry:
+  %x_addr = alloca double                         ; <double*> [#uses=2]
+  %retval = alloca double, align 8                ; <double*> [#uses=2]
+  %0 = alloca double, align 8                     ; <double*> [#uses=2]
+  %"alloca point" = bitcast i32 0 to i32          ; <i32> [#uses=0]
+  store double %x, double* %x_addr
+  %1 = load double, double* %x_addr, align 8              ; <double> [#uses=1]
+  %2 = call double @fabs(double %1) nounwind readnone ; <double> [#uses=1]
+  %3 = call double @sqrt(double %2) nounwind readonly ; <double> [#uses=1]
+  %4 = fadd double %3, 0.000000e+00               ; <double> [#uses=1]
+  store double %4, double* %0, align 8
+  %5 = load double, double* %0, align 8                   ; <double> [#uses=1]
+  store double %5, double* %retval, align 8
+  br label %return
+
+return:                                           ; preds = %entry
+  %retval1 = load double, double* %retval                 ; <double> [#uses=1]
+  ret double %retval1
+}
+
+declare double @fabs(double)
+
+declare double @sqrt(double) nounwind readonly