1 files changed, 141 insertions, 0 deletions
diff --git a/llvm/test/Analysis/ScalarEvolution/lshr-shl-differentconstmask.ll b/llvm/test/Analysis/ScalarEvolution/lshr-shl-differentconstmask.ll
new file mode 100644
index 00000000000..0955d3ee3a6
--- /dev/null
+++ b/llvm/test/Analysis/ScalarEvolution/lshr-shl-differentconstmask.ll
@@ -0,0 +1,141 @@
+; NOTE: Assertions have been autogenerated by utils/update_analyze_test_checks.py
+; RUN: opt -S -analyze -scalar-evolution < %s | FileCheck %s
+
+; The obvious case.
+define i32 @udiv_biggerLshr(i32 %val) nounwind {
+; CHECK-LABEL: 'udiv_biggerLshr'
+; CHECK-NEXT:  Classifying expressions for: @udiv_biggerLshr
+; CHECK-NEXT:    %tmp1 = udiv i32 %val, 64
+; CHECK-NEXT:    -->  (%val /u 64) U: [0,67108864) S: [0,67108864)
+; CHECK-NEXT:    %tmp2 = mul i32 %tmp1, 16
+; CHECK-NEXT:    -->  (16 * (%val /u 64)) U: [0,1073741809) S: [0,1073741809)
+; CHECK-NEXT:  Determining loop execution counts for: @udiv_biggerLshr
+;
+  %tmp1 = udiv i32 %val, 64
+  %tmp2 = mul i32 %tmp1, 16
+  ret i32 %tmp2
+}
+
+define i32 @udiv_biggerShl(i32 %val) nounwind {
+; CHECK-LABEL: 'udiv_biggerShl'
+; CHECK-NEXT:  Classifying expressions for: @udiv_biggerShl
+; CHECK-NEXT:    %tmp1 = udiv i32 %val, 16
+; CHECK-NEXT:    -->  (%val /u 16) U: [0,268435456) S: [0,268435456)
+; CHECK-NEXT:    %tmp2 = mul i32 %tmp1, 64
+; CHECK-NEXT:    -->  (64 * (%val /u 16)) U: [0,-63) S: [-2147483648,2147483585)
+; CHECK-NEXT:  Determining loop execution counts for: @udiv_biggerShl
+;
+  %tmp1 = udiv i32 %val, 16
+  %tmp2 = mul i32 %tmp1, 64
+  ret i32 %tmp2
+}
+
+; Or, it could have been transformed to shifts
+
+define i32 @shifty_biggerLshr(i32 %val) {
+; CHECK-LABEL: 'shifty_biggerLshr'
+; CHECK-NEXT:  Classifying expressions for: @shifty_biggerLshr
+; CHECK-NEXT:    %tmp1 = lshr i32 %val, 6
+; CHECK-NEXT:    -->  (%val /u 64) U: [0,67108864) S: [0,67108864)
+; CHECK-NEXT:    %tmp2 = shl i32 %tmp1, 4
+; CHECK-NEXT:    -->  (16 * (%val /u 64)) U: [0,1073741809) S: [0,1073741809)
+; CHECK-NEXT:  Determining loop execution counts for: @shifty_biggerLshr
+;
+  %tmp1 = lshr i32 %val, 6
+  %tmp2 = shl i32 %tmp1, 4
+  ret i32 %tmp2
+}
+
+define i32 @shifty_biggerLshr_lshrexact(i32 %val) {
+; CHECK-LABEL: 'shifty_biggerLshr_lshrexact'
+; CHECK-NEXT:  Classifying expressions for: @shifty_biggerLshr_lshrexact
+; CHECK-NEXT:    %tmp1 = lshr exact i32 %val, 6
+; CHECK-NEXT:    -->  (%val /u 64) U: [0,67108864) S: [0,67108864)
+; CHECK-NEXT:    %tmp2 = shl i32 %tmp1, 4
+; CHECK-NEXT:    -->  (16 * (%val /u 64)) U: [0,1073741809) S: [0,1073741809)
+; CHECK-NEXT:  Determining loop execution counts for: @shifty_biggerLshr_lshrexact
+;
+  %tmp1 = lshr exact i32 %val, 6
+  %tmp2 = shl i32 %tmp1, 4
+  ret i32 %tmp2
+}
+
+define i32 @shifty_biggerShr(i32 %val) {
+; CHECK-LABEL: 'shifty_biggerShr'
+; CHECK-NEXT:  Classifying expressions for: @shifty_biggerShr
+; CHECK-NEXT:    %tmp1 = lshr i32 %val, 4
+; CHECK-NEXT:    -->  (%val /u 16) U: [0,268435456) S: [0,268435456)
+; CHECK-NEXT:    %tmp2 = shl i32 %tmp1, 6
+; CHECK-NEXT:    -->  (64 * (%val /u 16)) U: [0,-63) S: [-2147483648,2147483585)
+; CHECK-NEXT:  Determining loop execution counts for: @shifty_biggerShr
+;
+  %tmp1 = lshr i32 %val, 4
+  %tmp2 = shl i32 %tmp1, 6
+  ret i32 %tmp2
+}
+
+define i32 @shifty_biggerShr_lshrexact(i32 %val) {
+; CHECK-LABEL: 'shifty_biggerShr_lshrexact'
+; CHECK-NEXT:  Classifying expressions for: @shifty_biggerShr_lshrexact
+; CHECK-NEXT:    %tmp1 = lshr exact i32 %val, 4
+; CHECK-NEXT:    -->  (%val /u 16) U: [0,268435456) S: [0,268435456)
+; CHECK-NEXT:    %tmp2 = shl i32 %tmp1, 6
+; CHECK-NEXT:    -->  (64 * (%val /u 16)) U: [0,-63) S: [-2147483648,2147483585)
+; CHECK-NEXT:  Determining loop execution counts for: @shifty_biggerShr_lshrexact
+;
+  %tmp1 = lshr exact i32 %val, 4
+  %tmp2 = shl i32 %tmp1, 6
+  ret i32 %tmp2
+}
+
+; Or, further folded into mask variant.
+
+define i32 @masky_biggerLshr(i32 %val) {
+; CHECK-LABEL: 'masky_biggerLshr'
+; CHECK-NEXT:  Classifying expressions for: @masky_biggerLshr
+; CHECK-NEXT:    %tmp1 = lshr i32 %val, 2
+; CHECK-NEXT:    -->  (%val /u 4) U: [0,1073741824) S: [0,1073741824)
+; CHECK-NEXT:    %tmp2 = and i32 %tmp1, -16
+; CHECK-NEXT:    -->  (16 * (%val /u 64)) U: [0,1073741809) S: [0,1073741809)
+; CHECK-NEXT:  Determining loop execution counts for: @masky_biggerLshr
+;
+  %tmp1 = lshr i32 %val, 2
+  %tmp2 = and i32 %tmp1, -16
+  ret i32 %tmp2
+}
+
+define i32 @masky_biggerLshr_lshrexact(i32 %val) {
+; CHECK-LABEL: 'masky_biggerLshr_lshrexact'
+; CHECK-NEXT:  Classifying expressions for: @masky_biggerLshr_lshrexact
+; CHECK-NEXT:    %tmp1 = lshr exact i32 %val, 2
+; CHECK-NEXT:    -->  (%val /u 4) U: [0,1073741824) S: [0,1073741824)
+; CHECK-NEXT:  Determining loop execution counts for: @masky_biggerLshr_lshrexact
+;
+  %tmp1 = lshr exact i32 %val, 2
+  ret i32 %tmp1
+}
+
+define i32 @masky_biggerShr(i32 %val) {
+; CHECK-LABEL: 'masky_biggerShr'
+; CHECK-NEXT:  Classifying expressions for: @masky_biggerShr
+; CHECK-NEXT:    %tmp1 = shl i32 %val, 2
+; CHECK-NEXT:    -->  (4 * %val) U: [0,-3) S: [-2147483648,2147483645)
+; CHECK-NEXT:    %tmp2 = and i32 %tmp1, -64
+; CHECK-NEXT:    -->  (64 * (zext i26 (trunc i32 (%val /u 16) to i26) to i32)) U: [0,-63) S: [0,-63)
+; CHECK-NEXT:  Determining loop execution counts for: @masky_biggerShr
+;
+  %tmp1 = shl i32 %val, 2
+  %tmp2 = and i32 %tmp1, -64
+  ret i32 %tmp2
+}
+
+define i32 @masky_biggerShr_lshrexact(i32 %val) {
+; CHECK-LABEL: 'masky_biggerShr_lshrexact'
+; CHECK-NEXT:  Classifying expressions for: @masky_biggerShr_lshrexact
+; CHECK-NEXT:    %tmp1 = shl i32 %val, 2
+; CHECK-NEXT:    -->  (4 * %val) U: [0,-3) S: [-2147483648,2147483645)
+; CHECK-NEXT:  Determining loop execution counts for: @masky_biggerShr_lshrexact
+;
+  %tmp1 = shl i32 %val, 2
+  ret i32 %tmp1
+}