From 20772547c5b685701e75d64118a2402a1f7bc796 Mon Sep 17 00:00:00 2001
From: Chris Lattner <sabre@nondot.org>
Date: Sun, 1 Jun 2003 03:38:24 +0000
Subject: [PATCH] * Implement cast (long|ulong) to bool * Fix cast of
 (short|ushort|int|uint) to bool to work right

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@6510 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Target/X86/InstSelectSimple.cpp | 26 ++++++++++++++++++++++----
 lib/Target/X86/X86ISelSimple.cpp    | 26 ++++++++++++++++++++++----
 2 files changed, 44 insertions(+), 8 deletions(-)

diff --git a/lib/Target/X86/InstSelectSimple.cpp b/lib/Target/X86/InstSelectSimple.cpp
index c62e68da270..3479b73d20e 100644
--- a/lib/Target/X86/InstSelectSimple.cpp
+++ b/lib/Target/X86/InstSelectSimple.cpp
@@ -1552,10 +1552,28 @@ void ISel::emitCastOperation(MachineBasicBlock *BB,
   // Implement casts to bool by using compare on the operand followed by set if
   // not zero on the result.
   if (DestTy == Type::BoolTy) {
-    if (SrcClass == cFP || SrcClass == cLong)
-      abort();  // FIXME: implement cast (long & FP) to bool
-    
-    BMI(BB, IP, X86::CMPri8, 2).addReg(SrcReg).addZImm(0);
+    switch (SrcClass) {
+    case cByte:
+      BMI(BB, IP, X86::TESTrr8, 2).addReg(SrcReg).addReg(SrcReg);
+      break;
+    case cShort:
+      BMI(BB, IP, X86::TESTrr16, 2).addReg(SrcReg).addReg(SrcReg);
+      break;
+    case cInt:
+      BMI(BB, IP, X86::TESTrr32, 2).addReg(SrcReg).addReg(SrcReg);
+      break;
+    case cLong: {
+      unsigned TmpReg = makeAnotherReg(Type::IntTy);
+      BMI(BB, IP, X86::ORrr32, 2, TmpReg).addReg(SrcReg).addReg(SrcReg+1);
+      break;
+    }
+    case cFP:
+      assert(0 && "FIXME: implement cast FP to bool");
+      abort();
+    }
+
+    // If the zero flag is not set, then the value is true, set the byte to
+    // true.
     BMI(BB, IP, X86::SETNEr, 1, DestReg);
     return;
   }
diff --git a/lib/Target/X86/X86ISelSimple.cpp b/lib/Target/X86/X86ISelSimple.cpp
index c62e68da270..3479b73d20e 100644
--- a/lib/Target/X86/X86ISelSimple.cpp
+++ b/lib/Target/X86/X86ISelSimple.cpp
@@ -1552,10 +1552,28 @@ void ISel::emitCastOperation(MachineBasicBlock *BB,
   // Implement casts to bool by using compare on the operand followed by set if
   // not zero on the result.
   if (DestTy == Type::BoolTy) {
-    if (SrcClass == cFP || SrcClass == cLong)
-      abort();  // FIXME: implement cast (long & FP) to bool
-    
-    BMI(BB, IP, X86::CMPri8, 2).addReg(SrcReg).addZImm(0);
+    switch (SrcClass) {
+    case cByte:
+      BMI(BB, IP, X86::TESTrr8, 2).addReg(SrcReg).addReg(SrcReg);
+      break;
+    case cShort:
+      BMI(BB, IP, X86::TESTrr16, 2).addReg(SrcReg).addReg(SrcReg);
+      break;
+    case cInt:
+      BMI(BB, IP, X86::TESTrr32, 2).addReg(SrcReg).addReg(SrcReg);
+      break;
+    case cLong: {
+      unsigned TmpReg = makeAnotherReg(Type::IntTy);
+      BMI(BB, IP, X86::ORrr32, 2, TmpReg).addReg(SrcReg).addReg(SrcReg+1);
+      break;
+    }
+    case cFP:
+      assert(0 && "FIXME: implement cast FP to bool");
+      abort();
+    }
+
+    // If the zero flag is not set, then the value is true, set the byte to
+    // true.
     BMI(BB, IP, X86::SETNEr, 1, DestReg);
     return;
   }
-- 
2.34.1