[InstCombine] add tests from D39421 to show current transforms; NFC

llvm-svn: 319182

diff --git a/llvm/test/Transforms/InstCombine/or-shifted-masks.ll b/llvm/test/Transforms/InstCombine/or-shifted-masks.ll
new file mode 100644 (file)
index 0000000..bee1c43
--- /dev/null
+++ b/llvm/test/Transforms/InstCombine/or-shifted-masks.ll
@@ -0,0 +1,133 @@
+; RUN: opt -S -instcombine < %s | FileCheck %s
+
+define i32 @or_and_shifts1(i32 %x) {
+; CHECK-LABEL: @or_and_shifts1(
+; CHECK-NEXT:    [[TMP1:%.*]] = shl i32 %x, 3
+; CHECK-NEXT:    [[TMP2:%.*]] = and i32 [[TMP1]], 8
+; CHECK-NEXT:    [[TMP3:%.*]] = shl i32 %x, 5
+; CHECK-NEXT:    [[TMP4:%.*]] = and i32 [[TMP3]], 32
+; CHECK-NEXT:    [[TMP5:%.*]] = or i32 [[TMP2]], [[TMP4]]
+; CHECK-NEXT:    ret i32 [[TMP5]]
+;
+  %1 = shl i32 %x, 3
+  %2 = and i32 %1, 15
+  %3 = shl i32 %x, 5
+  %4 = and i32 %3, 60
+  %5 = or i32 %2, %4
+  ret i32 %5
+}
+
+define i32 @or_and_shifts2(i32 %x) {
+; CHECK-LABEL: @or_and_shifts2(
+; CHECK-NEXT:    [[TMP1:%.*]] = shl i32 %x, 3
+; CHECK-NEXT:    [[TMP2:%.*]] = and i32 [[TMP1]], 896
+; CHECK-NEXT:    [[TMP3:%.*]] = lshr i32 %x, 4
+; CHECK-NEXT:    [[TMP4:%.*]] = and i32 [[TMP3]], 7
+; CHECK-NEXT:    [[TMP5:%.*]] = or i32 [[TMP2]], [[TMP4]]
+; CHECK-NEXT:    ret i32 [[TMP5]]
+;
+  %1 = shl i32 %x, 3
+  %2 = and i32 %1, 896
+  %3 = lshr i32 %x, 4
+  %4 = and i32 %3, 7
+  %5 = or i32 %2, %4
+  ret i32 %5
+}
+
+define i32 @or_and_shift_shift_and(i32 %x) {
+; CHECK-LABEL: @or_and_shift_shift_and(
+; CHECK-NEXT:    [[TMP1:%.*]] = shl i32 %x, 3
+; CHECK-NEXT:    [[TMP2:%.*]] = and i32 [[TMP1]], 56
+; CHECK-NEXT:    [[TMP3:%.*]] = shl i32 %x, 2
+; CHECK-NEXT:    [[TMP4:%.*]] = and i32 [[TMP3]], 28
+; CHECK-NEXT:    [[TMP5:%.*]] = or i32 [[TMP2]], [[TMP4]]
+; CHECK-NEXT:    ret i32 [[TMP5]]
+;
+  %1 = and i32 %x, 7
+  %2 = shl i32 %1, 3
+  %3 = shl i32 %x, 2
+  %4 = and i32 %3, 28
+  %5 = or i32 %2, %4
+  ret i32 %5
+}
+
+define i32 @multiuse1(i32 %x) {
+; CHECK-LABEL: @multiuse1(
+; CHECK-NEXT:    [[TMP1:%.*]] = shl i32 %x, 6
+; CHECK-NEXT:    [[TMP2:%.*]] = and i32 [[TMP1]], 384
+; CHECK-NEXT:    [[TMP3:%.*]] = lshr i32 %x, 1
+; CHECK-NEXT:    [[TMP4:%.*]] = and i32 [[TMP3]], 3
+; CHECK-NEXT:    [[TMP5:%.*]] = or i32 [[TMP4]], [[TMP2]]
+; CHECK-NEXT:    ret i32 [[TMP5]]
+;
+  %1 = and i32 %x, 2
+  %2 = and i32 %x, 4
+  %3 = shl nuw nsw i32 %1, 6
+  %4 = lshr exact i32 %1, 1
+  %5 = shl nuw nsw i32 %2, 6
+  %6 = lshr exact i32 %2, 1
+  %7 = or i32 %3, %5
+  %8 = or i32 %4, %6
+  %9 = or i32 %8, %7
+  ret i32 %9
+}
+
+define i32 @multiuse2(i32 %x) {
+; CHECK-LABEL: @multiuse2(
+; CHECK-NEXT:    [[TMP1:%.*]] = shl i32 %x, 1
+; CHECK-NEXT:    [[TMP2:%.*]] = and i32 [[TMP1]], 12
+; CHECK-NEXT:    [[TMP3:%.*]] = shl i32 %x, 8
+; CHECK-NEXT:    [[TMP4:%.*]] = and i32 [[TMP3]], 24576
+; CHECK-NEXT:    [[TMP5:%.*]] = shl i32 %x, 8
+; CHECK-NEXT:    [[TMP6:%.*]] = and i32 [[TMP5]], 7680
+; CHECK-NEXT:    [[TMP7:%.*]] = or i32 [[TMP4]], [[TMP6]]
+; CHECK-NEXT:    [[TMP8:%.*]] = shl i32 %x, 1
+; CHECK-NEXT:    [[TMP9:%.*]] = and i32 [[TMP8]], 240
+; CHECK-NEXT:    [[TMP10:%.*]] = or i32 [[TMP2]], [[TMP9]]
+; CHECK-NEXT:    [[TMP11:%.*]] = or i32 [[TMP7]], [[TMP10]]
+; CHECK-NEXT:    ret i32 [[TMP11]]
+;
+  %1 = and i32 %x, 6
+  %2 = shl nuw nsw i32 %1, 8
+  %3 = shl nuw nsw i32 %1, 1
+  %4 = and i32 %x, 24
+  %5 = shl nuw nsw i32 %4, 8
+  %6 = shl nuw nsw i32 %4, 1
+  %7 = and i32 %x, 96
+  %8 = shl nuw nsw i32 %7, 8
+  %9 = shl nuw nsw i32 %7, 1
+  %10 = or i32 %2, %5
+  %11 = or i32 %8, %10
+  %12 = or i32 %9, %6
+  %13 = or i32 %3, %12
+  %14 = or i32 %11, %13
+  ret i32 %14
+}
+
+define i32 @multiuse3(i32 %x) {
+; CHECK-LABEL: @multiuse3(
+; CHECK-NEXT:    [[TMP1:%.*]] = and i32 %x, 96
+; CHECK-NEXT:    [[TMP2:%.*]] = shl nuw nsw i32 [[TMP1]], 6
+; CHECK-NEXT:    [[TMP3:%.*]] = lshr exact i32 [[TMP1]], 1
+; CHECK-NEXT:    [[TMP4:%.*]] = shl i32 %x, 6
+; CHECK-NEXT:    [[TMP5:%.*]] = and i32 [[TMP4]], 1920
+; CHECK-NEXT:    [[TMP6:%.*]] = or i32 [[TMP2]], [[TMP5]]
+; CHECK-NEXT:    [[TMP7:%.*]] = lshr i32 %x, 1
+; CHECK-NEXT:    [[TMP8:%.*]] = and i32 [[TMP7]], 15
+; CHECK-NEXT:    [[TMP9:%.*]] = or i32 [[TMP3]], [[TMP8]]
+; CHECK-NEXT:    [[TMP10:%.*]] = or i32 [[TMP9]], [[TMP6]]
+; CHECK-NEXT:    ret i32 [[TMP10]]
+;
+  %1 = and i32 %x, 96
+  %2 = shl nuw nsw i32 %1, 6
+  %3 = lshr exact i32 %1, 1
+  %4 = shl i32 %x, 6
+  %5 = and i32 %4, 1920
+  %6 = or i32 %2, %5
+  %7 = lshr i32 %x, 1
+  %8 = and i32 %7, 15
+  %9 = or i32 %3, %8
+  %10 = or i32 %9, %6
+  ret i32 %10
+}
+