commit ca3cf87eee51252131f6811abfa4fec89f0ac560
author Craig Topper <craig.topper@intel.com> Wed Nov 08 19:38:45 2017 +0000
committer Craig Topper <craig.topper@intel.com> Wed Nov 08 19:38:45 2017 +0000
tree 6abfa5d9031f905646a18987bdd9fc62e583cae6
parent 94964bb7560e6c547afe659b09263675175f1410

[ValueTracking] Use APInt::isNullValue/isOneValue which are more efficient for large APInts.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@317712 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Analysis/ValueTracking.cpp

diff --git a/lib/Analysis/ValueTracking.cpp b/lib/Analysis/ValueTracking.cpp
index f016041..2010858 100644
--- a/lib/Analysis/ValueTracking.cpp
+++ b/lib/Analysis/ValueTracking.cpp
@@ -4138,7 +4138,8 @@
     // Is the sign bit set?
     // (X <s 0) ? X : MAXVAL ==> (X >u MAXVAL) ? X : MAXVAL ==> UMAX
     // (X <s 0) ? MAXVAL : X ==> (X >u MAXVAL) ? MAXVAL : X ==> UMIN
-    if (Pred == CmpInst::ICMP_SLT && *C1 == 0 && C2->isMaxSignedValue())
+    if (Pred == CmpInst::ICMP_SLT && C1->isNullValue() &&
+        C2->isMaxSignedValue())
       return {CmpLHS == TrueVal ? SPF_UMAX : SPF_UMIN, SPNB_NA, false};
 
     // Is the sign bit clear?
@@ -4270,13 +4271,15 @@
 
       // ABS(X) ==> (X >s 0) ? X : -X and (X >s -1) ? X : -X
       // NABS(X) ==> (X >s 0) ? -X : X and (X >s -1) ? -X : X
-      if (Pred == ICmpInst::ICMP_SGT && (*C1 == 0 || C1->isAllOnesValue())) {
+      if (Pred == ICmpInst::ICMP_SGT &&
+          (C1->isNullValue() || C1->isAllOnesValue())) {
         return {(CmpLHS == TrueVal) ? SPF_ABS : SPF_NABS, SPNB_NA, false};
       }
 
       // ABS(X) ==> (X <s 0) ? -X : X and (X <s 1) ? -X : X
       // NABS(X) ==> (X <s 0) ? X : -X and (X <s 1) ? X : -X
-      if (Pred == ICmpInst::ICMP_SLT && (*C1 == 0 || *C1 == 1)) {
+      if (Pred == ICmpInst::ICMP_SLT &&
+          (C1->isNullValue() || C1->isOneValue())) {
         return {(CmpLHS == FalseVal) ? SPF_ABS : SPF_NABS, SPNB_NA, false};
       }
     }