From c2f09393205b5be542d984a3f0c65f17dcc417fb Mon Sep 17 00:00:00 2001
From: "Vikram S. Adve" <vadve@cs.uiuc.edu>
Date: Sun, 25 May 2003 21:58:11 +0000
Subject: Bug fix: sign-extension was not happening for C = -MININT since C ==
-C!
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@6332 91177308-0d34-0410-b5e6-96231b3b80d8
---
lib/Target/SparcV9/SparcV9InstrInfo.cpp | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
(limited to 'lib/Target')
diff --git a/lib/Target/SparcV9/SparcV9InstrInfo.cpp b/lib/Target/SparcV9/SparcV9InstrInfo.cpp
index 977360b..aa48278 100644
--- a/lib/Target/SparcV9/SparcV9InstrInfo.cpp
+++ b/lib/Target/SparcV9/SparcV9InstrInfo.cpp
@@ -142,8 +142,9 @@ CreateSETSWConst(const TargetMachine& target, int32_t C,
// Set the low 32 bits of dest
CreateSETUWConst(target, (uint32_t) C, dest, mvec, /*isSigned*/true);
- // Sign-extend to the high 32 bits if needed
- if (C < 0 && (-C) > (int32_t) MAXSIMM)
+ // Sign-extend to the high 32 bits if needed.
+ // NOTE: The value C = 0x80000000 is bad: -C == C and so -C is < MAXSIMM
+ if (C < 0 && (C == -C || -C > (int32_t) MAXSIMM))
mvec.push_back(BuildMI(V9::SRA, 3).addReg(dest).addZImm(0).addRegDef(dest));
}
--
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