Teach ComputeNumSignBits about signed divisions.

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

diff --git a/test/Transforms/InstCombine/trunc.ll b/test/Transforms/InstCombine/trunc.ll
index 93e3753cf50234e760006330d2de0aa0392515d0..ee81cf8c3c5d87e18db375a829d55c73a461d9cf 100644 (file)
--- a/test/Transforms/InstCombine/trunc.ll
+++ b/test/Transforms/InstCombine/trunc.ll
@@ -1,38 +1,120 @@
-; RUN: opt < %s -instcombine -S > %t
-; RUN: not grep zext %t
-; RUN: not grep sext %t
+; RUN: opt < %s -instcombine -S | FileCheck %s
+target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64"
 
 ; Instcombine should be able to eliminate all of these ext casts.
 
 declare void @use(i32)
 
-define i64 @foo(i64 %a) {
+define i64 @test1(i64 %a) {
   %b = trunc i64 %a to i32
   %c = and i32 %b, 15
   %d = zext i32 %c to i64
   call void @use(i32 %b)
   ret i64 %d
+; CHECK-LABEL: @test1(
+; CHECK-NOT: ext
+; CHECK: ret
 }
-define i64 @bar(i64 %a) {
+define i64 @test2(i64 %a) {
   %b = trunc i64 %a to i32
   %c = shl i32 %b, 4
   %q = ashr i32 %c, 4
   %d = sext i32 %q to i64
   call void @use(i32 %b)
   ret i64 %d
+; CHECK-LABEL: @test2(
+; CHECK: shl i64 %a, 36
+; CHECK: %d = ashr exact i64 {{.*}}, 36
+; CHECK: ret i64 %d
 }
-define i64 @goo(i64 %a) {
+define i64 @test3(i64 %a) {
   %b = trunc i64 %a to i32
   %c = and i32 %b, 8
   %d = zext i32 %c to i64
   call void @use(i32 %b)
   ret i64 %d
+; CHECK-LABEL: @test3(
+; CHECK-NOT: ext
+; CHECK: ret
 }
-define i64 @hoo(i64 %a) {
+define i64 @test4(i64 %a) {
   %b = trunc i64 %a to i32
   %c = and i32 %b, 8
   %x = xor i32 %c, 8
   %d = zext i32 %x to i64
   call void @use(i32 %b)
   ret i64 %d
+; CHECK-LABEL: @test4(
+; CHECK: = and i64 %a, 8
+; CHECK: = xor i64 {{.*}}, 8
+; CHECK-NOT: ext
+; CHECK: ret
+}
+
+define i32 @test5(i32 %A) {
+  %B = zext i32 %A to i128
+  %C = lshr i128 %B, 16
+  %D = trunc i128 %C to i32
+  ret i32 %D
+; CHECK-LABEL: @test5(
+; CHECK: %C = lshr i32 %A, 16
+; CHECK: ret i32 %C
+}
+
+define i32 @test6(i64 %A) {
+  %B = zext i64 %A to i128
+  %C = lshr i128 %B, 32
+  %D = trunc i128 %C to i32
+  ret i32 %D
+; CHECK-LABEL: @test6(
+; CHECK: %C = lshr i64 %A, 32
+; CHECK: %D = trunc i64 %C to i32
+; CHECK: ret i32 %D
+}
+
+define i92 @test7(i64 %A) {
+  %B = zext i64 %A to i128
+  %C = lshr i128 %B, 32
+  %D = trunc i128 %C to i92
+  ret i92 %D
+; CHECK-LABEL: @test7(
+; CHECK: %B = zext i64 %A to i92
+; CHECK: %C = lshr i92 %B, 32
+; CHECK: ret i92 %C
+}
+
+define i64 @test8(i32 %A, i32 %B) {
+  %tmp38 = zext i32 %A to i128
+  %tmp32 = zext i32 %B to i128
+  %tmp33 = shl i128 %tmp32, 32
+  %ins35 = or i128 %tmp33, %tmp38
+  %tmp42 = trunc i128 %ins35 to i64
+  ret i64 %tmp42
+; CHECK-LABEL: @test8(
+; CHECK:   %tmp38 = zext i32 %A to i64
+; CHECK:   %tmp32 = zext i32 %B to i64
+; CHECK:   %tmp33 = shl nuw i64 %tmp32, 32
+; CHECK:   %ins35 = or i64 %tmp33, %tmp38
+; CHECK:   ret i64 %ins35
+}
+
+define i8 @test9(i32 %X) {
+  %Y = and i32 %X, 42
+  %Z = trunc i32 %Y to i8
+  ret i8 %Z
+; CHECK-LABEL: @test9(
+; CHECK: trunc
+; CHECK: and
+; CHECK: ret
+}
+
+; rdar://8808586
+define i8 @test10(i32 %X) {
+  %Y = trunc i32 %X to i8
+  %Z = and i8 %Y, 42
+  ret i8 %Z
+; CHECK-LABEL: @test10(
+; CHECK: trunc
+; CHECK: and
+; CHECK: ret
 }