InstCombine: Combine mul with div.

[oota-llvm.git] / test / Transforms / InstCombine / div.ll

diff --git a/test/Transforms/InstCombine/div.ll b/test/Transforms/InstCombine/div.ll
index 9c7ba9b03059d322145634f586a781f16d714811..67c5c78cd834e2273014e0408dc0bc6b31ddcb19 100644 (file)
--- a/test/Transforms/InstCombine/div.ll
+++ b/test/Transforms/InstCombine/div.ll
@@ -175,3 +175,75 @@ define i32 @test20(i32 %x) {
 ; CHECK-NEXT: select i1 %{{.*}}, i32 %x, i32 {{.*}}
 ; CHECK-NEXT: ret i32
 }
+
+define i32 @test21(i32 %a) {
+  %shl = shl nsw i32 %a, 2
+  %div = sdiv i32 %shl, 12
+  ret i32 %div
+; CHECK-LABEL: @test21(
+; CHECK-NEXT: %div = sdiv i32 %a, 3
+; CHECK-NEXT: ret i32 %div
+}
+
+define i32 @test22(i32 %a) {
+  %mul = mul nsw i32 %a, 3
+  %div = sdiv i32 %mul, 12
+  ret i32 %div
+; CHECK-LABEL: @test22(
+; CHECK-NEXT: %div = sdiv i32 %a, 4
+; CHECK-NEXT: ret i32 %div
+}
+
+define i32 @test23(i32 %a) {
+  %shl = shl nuw i32 %a, 2
+  %div = udiv i32 %shl, 12
+  ret i32 %div
+; CHECK-LABEL: @test23(
+; CHECK-NEXT: %div = udiv i32 %a, 3
+; CHECK-NEXT: ret i32 %div
+}
+
+define i32 @test24(i32 %a) {
+  %mul = mul nuw i32 %a, 3
+  %div = udiv i32 %mul, 12
+  ret i32 %div
+; CHECK-LABEL: @test24(
+; CHECK-NEXT: %div = lshr i32 %a, 2
+; CHECK-NEXT: ret i32 %div
+}
+
+define i32 @test25(i32 %a) {
+  %shl = shl nsw i32 %a, 2
+  %div = sdiv i32 %shl, 2
+  ret i32 %div
+; CHECK-LABEL: @test25(
+; CHECK-NEXT: %div = shl nsw i32 %a, 1
+; CHECK-NEXT: ret i32 %div
+}
+
+define i32 @test26(i32 %a) {
+  %mul = mul nsw i32 %a, 12
+  %div = sdiv i32 %mul, 3
+  ret i32 %div
+; CHECK-LABEL: @test26(
+; CHECK-NEXT: %div = shl nsw i32 %a, 2
+; CHECK-NEXT: ret i32 %div
+}
+
+define i32 @test27(i32 %a) {
+  %shl = shl nuw i32 %a, 2
+  %div = udiv i32 %shl, 2
+  ret i32 %div
+; CHECK-LABEL: @test27(
+; CHECK-NEXT: %div = shl nuw i32 %a, 1
+; CHECK-NEXT: ret i32 %div
+}
+
+define i32 @test28(i32 %a) {
+  %mul = mul nuw i32 %a, 36
+  %div = udiv i32 %mul, 3
+  ret i32 %div
+; CHECK-LABEL: @test28(
+; CHECK-NEXT: %div = mul nuw i32 %a, 12
+; CHECK-NEXT: ret i32 %div
+}