[PowerPC] [Constant Hoisting] Enable constant hoisting on PPC

Implements the various TTI functions to enable constant hoisting on PPC. The
only significant test-suite change is this:

MultiSource/Benchmarks/VersaBench/bmm/bmm - 20% speedup
(which essentially reverses the slowdown from r206120).

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@206141 91177308-0d34-0410-b5e6-96231b3b80d8

3 files changed, 93 insertions, 0 deletions

diff --git a/test/Transforms/ConstantHoisting/PowerPC/const-base-addr.ll b/test/Transforms/ConstantHoisting/PowerPC/const-base-addr.ll
new file mode 100644
index 0000000000..b4337eeda6
--- /dev/null
+++ b/test/Transforms/ConstantHoisting/PowerPC/const-base-addr.ll
@@ -0,0 +1,23 @@
+; RUN: opt -S -consthoist < %s | FileCheck %s
+target datalayout = "E-m:e-i64:64-n32:64"
+target triple = "powerpc64-unknown-linux-gnu"
+
+%T = type { i32, i32, i32, i32 }
+
+; Test if even cheap base addresses are hoisted.
+define i32 @test1() nounwind {
+; CHECK-LABEL:  @test1
+; CHECK:        %const = bitcast i32 12345678 to i32
+; CHECK:        %1 = inttoptr i32 %const to %T*
+; CHECK:        %addr1 = getelementptr %T* %1, i32 0, i32 1
+  %addr1 = getelementptr %T* inttoptr (i32 12345678 to %T*), i32 0, i32 1
+  %tmp1 = load i32* %addr1
+  %addr2 = getelementptr %T* inttoptr (i32 12345678 to %T*), i32 0, i32 2
+  %tmp2 = load i32* %addr2
+  %addr3 = getelementptr %T* inttoptr (i32 12345678 to %T*), i32 0, i32 3
+  %tmp3 = load i32* %addr3
+  %tmp4 = add i32 %tmp1, %tmp2
+  %tmp5 = add i32 %tmp3, %tmp4
+  ret i32 %tmp5
+}
+
diff --git a/test/Transforms/ConstantHoisting/PowerPC/lit.local.cfg b/test/Transforms/ConstantHoisting/PowerPC/lit.local.cfg
new file mode 100644
index 0000000000..2e46300558
--- /dev/null
+++ b/test/Transforms/ConstantHoisting/PowerPC/lit.local.cfg
@@ -0,0 +1,4 @@
+targets = set(config.root.targets_to_build.split())
+if not 'PowerPC' in targets:
+    config.unsupported = True
+
diff --git a/test/Transforms/ConstantHoisting/PowerPC/masks.ll b/test/Transforms/ConstantHoisting/PowerPC/masks.ll
new file mode 100644
index 0000000000..d553182011
--- /dev/null
+++ b/test/Transforms/ConstantHoisting/PowerPC/masks.ll
@@ -0,0 +1,66 @@
+; RUN: opt -S -consthoist < %s | FileCheck %s
+target datalayout = "E-m:e-i64:64-n32:64"
+target triple = "powerpc64-unknown-linux-gnu"
+
+; Here the masks are all contiguous, and should not be hoisted.
+define i32 @test1() nounwind {
+entry:
+; CHECK-LABEL:  @test1
+; CHECK-NOT: bitcast i32 65535 to i32
+; CHECK: and i32 undef, 65535
+  %conv121 = and i32 undef, 65535
+  br i1 undef, label %if.then152, label %if.end167
+
+if.then152:
+; CHECK: and i32 undef, 65535
+  %conv153 = and i32 undef, 65535
+  br i1 undef, label %if.end167, label %end2
+
+if.end167:
+; CHECK: and i32 {{.*}}, 32768
+  %shl161 = shl nuw nsw i32 %conv121, 15
+  %0 = load i8* undef, align 1
+  %conv169 = zext i8 %0 to i32
+  %shl170 = shl nuw nsw i32 %conv169, 7
+  %shl161.masked = and i32 %shl161, 32768
+  %conv174 = or i32 %shl170, %shl161.masked
+  %cmp178 = icmp ugt i32 %conv174, 32767
+  br i1 %cmp178, label %end1, label %end2
+
+end1:
+  unreachable
+
+end2:
+  unreachable
+}
+
+; Here the masks are not contiguous, and should be hoisted.
+define i32 @test2() nounwind {
+entry:
+; CHECK-LABEL: @test2
+; CHECK: bitcast i32 65531 to i32
+  %conv121 = and i32 undef, 65531
+  br i1 undef, label %if.then152, label %if.end167
+
+if.then152:
+  %conv153 = and i32 undef, 65531
+  br i1 undef, label %if.end167, label %end2
+
+if.end167:
+; CHECK: add i32 {{.*}}, -32758
+  %shl161 = shl nuw nsw i32 %conv121, 15
+  %0 = load i8* undef, align 1
+  %conv169 = zext i8 %0 to i32
+  %shl170 = shl nuw nsw i32 %conv169, 7
+  %shl161.masked = and i32 %shl161, 32773
+  %conv174 = or i32 %shl170, %shl161.masked
+  %cmp178 = icmp ugt i32 %conv174, 32767
+  br i1 %cmp178, label %end1, label %end2
+
+end1:
+  unreachable
+
+end2:
+  unreachable
+}
+