Revert r344693 ("[ARM] bottom-top mul support in ARMParallelDSP")

Still causing failures on the polly-aosp buildbot; I'll follow up
with a reduced testcase.

llvm-svn: 344752

1 files changed, 53 insertions, 0 deletions

diff --git a/llvm/test/CodeGen/ARM/smlad7.ll b/llvm/test/CodeGen/ARM/smlad7.ll
new file mode 100644
index 00000000000..76c7d676f69
--- /dev/null
+++ b/llvm/test/CodeGen/ARM/smlad7.ll
@@ -0,0 +1,53 @@
+; RUN: opt -mtriple=arm-arm-eabi -mcpu=cortex-m33 < %s -arm-parallel-dsp -S | FileCheck %s
+;
+; Alias check: check that the rewrite isn't triggered when there's a store
+; aliasing one of the mul load operands. Arguments are now annotated with
+; 'noalias'.
+;
+; CHECK-NOT:  call i32 @llvm.arm.smlad
+;
+define dso_local i32 @test(i32 %arg, i32* noalias %arg1, i16* noalias readonly %arg2, i16* noalias readonly %arg3) {
+entry:
+  %cmp24 = icmp sgt i32 %arg, 0
+  br i1 %cmp24, label %for.body.preheader, label %for.cond.cleanup
+
+for.body.preheader:
+  %.pre = load i16, i16* %arg3, align 2
+  %.pre27 = load i16, i16* %arg2, align 2
+  br label %for.body
+
+for.cond.cleanup:
+  %mac1.0.lcssa = phi i32 [ 0, %entry ], [ %add11, %for.body ]
+  ret i32 %mac1.0.lcssa
+
+for.body:
+  %mac1.026 = phi i32 [ %add11, %for.body ], [ 0, %for.body.preheader ]
+  %i.025 = phi i32 [ %add, %for.body ], [ 0, %for.body.preheader ]
+  %arrayidx = getelementptr inbounds i16, i16* %arg3, i32 %i.025
+  %0 = load i16, i16* %arrayidx, align 2
+
+; Store inserted here, aliasing only with loads from 'arrayidx'.
+  store i16 42, i16* %arrayidx, align 2
+
+  %add = add nuw nsw i32 %i.025, 1
+  %arrayidx1 = getelementptr inbounds i16, i16* %arg3, i32 %add
+  %1 = load i16, i16* %arrayidx1, align 2
+  %arrayidx3 = getelementptr inbounds i16, i16* %arg2, i32 %i.025
+  %2 = load i16, i16* %arrayidx3, align 2
+  %conv = sext i16 %2 to i32
+  %conv4 = sext i16 %0 to i32
+  %mul = mul nsw i32 %conv, %conv4
+  %arrayidx6 = getelementptr inbounds i16, i16* %arg2, i32 %add
+  %3 = load i16, i16* %arrayidx6, align 2
+  %conv7 = sext i16 %3 to i32
+  %conv8 = sext i16 %1 to i32
+  %mul9 = mul nsw i32 %conv7, %conv8
+  %add10 = add i32 %mul, %mac1.026
+
+; Here the Mul is the LHS, and the Add the RHS.
+  %add11 = add i32 %mul9, %add10
+
+  %exitcond = icmp ne i32 %add, %arg
+  br i1 %exitcond, label %for.body, label %for.cond.cleanup
+}
+