[PATCH] Fix big shift constant folding

[Paweł Bylica]

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D7701

Files:
  test/Transforms/ConstProp/shift.ll

Index: test/Transforms/ConstProp/shift.ll
===================================================================
--- /dev/null
+++ test/Transforms/ConstProp/shift.ll
@@ -0,0 +1,52 @@
+; RUN: opt < %s -constprop -S | FileCheck %s
+
+; CHECK-LABEL: shift_undef_65
+define void @shift_undef_65(i65* %p) {
+  %r1 = lshr i65 2, 18446744073709551617
+  ; CHECK: store i65 undef, %p
+  store i65 %r1, i65* %p
+
+  %r2 = ashr i65 4, 18446744073709551617
+  ; CHECK: store i65 undef, %p
+  store i65 %r2, i65* %p
+
+  %r3 = shl i65 1, 18446744073709551617
+  ; CHECK: store i65 undef, %p
+  store i65 %r3, i65* %p
+
+  ret void
+}
+
+; CHECK-LABEL: shift_undef_256
+define void @shift_undef_256(i256* %p) {
+  %r1 = lshr i256 2, 18446744073709551617
+  ; CHECK: store i256 undef, %p
+  store i256 %r1, i256* %p
+
+  %r2 = ashr i256 4, 18446744073709551618
+  ; CHECK: store i256 undef, %p
+  store i256 %r2, i256* %p
+
+  %r3 = shl i256 1, 18446744073709551619
+  ; CHECK: store i256 undef, %p
+  store i256 %r3, i256* %p
+
+  ret void
+}
+
+; CHECK-LABEL: shift_undef_511
+define void @shift_undef_511(i511* %p) {
+  %r1 = lshr i511 -1, 1208925819614629174706276 ; 2^80 + 100
+  ; CHECK: store i511 undef, %p
+  store i511 %r1, i511* %p
+
+  %r2 = ashr i511 -2, 1208925819614629174706200
+  ; CHECK: store i511 undef, %p
+  store i511 %r2, i511* %p
+
+  %r3 = shl i511 -3, 1208925819614629174706180
+  ; CHECK: store i511 undef, %p
+  store i511 %r3, i511* %p
+
+  ret void
+}

EMAIL PREFERENCES
  http://reviews.llvm.org/settings/panel/emailpreferences/
-------------- next part --------------
A non-text attachment was scrubbed...
Name: D7701.21531.patch
Type: text/x-patch
Size: 1466 bytes
Desc: not available
URL: <http://lists.llvm.org/pipermail/llvm-commits/attachments/20150309/06cc36fa/attachment.bin>