Fix a sign-extension bug in PPCCTRLoops

Don't sign extend the immediate value from the OR instruction in
an LIS/OR pair.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@177361 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Target/PowerPC/PPCCTRLoops.cpp b/lib/Target/PowerPC/PPCCTRLoops.cpp
index ecece8c73dc779d8c65d46983633e68545df1c70..5b20f81a3e080c617a96c3afd7f2bd87154f3cb5 100644 (file)
--- a/lib/Target/PowerPC/PPCCTRLoops.cpp
+++ b/lib/Target/PowerPC/PPCCTRLoops.cpp
@@ -396,7 +396,7 @@ CountValue *PPCCTRLoops::getTripCount(MachineLoop *L,
         // Here we need to look for an immediate load (an li or lis/ori pair).
         if (DefInstr && (DefInstr->getOpcode() == PPC::ORI8 ||
                          DefInstr->getOpcode() == PPC::ORI)) {
-          int64_t start = (short) DefInstr->getOperand(2).getImm();
+          int64_t start = DefInstr->getOperand(2).getImm();
           MachineInstr *DefInstr2 =
             MRI->getVRegDef(DefInstr->getOperand(1).getReg());
           if (DefInstr2 && (DefInstr2->getOpcode() == PPC::LIS8 ||

diff --git a/test/CodeGen/PowerPC/negctr.ll b/test/CodeGen/PowerPC/negctr.ll
index 9b438a138fcb177b0bcfc05c37761cd59eed9902..2f6995c65dd8154ca22bc4f769b09f5b3a3721e1 100644 (file)
--- a/test/CodeGen/PowerPC/negctr.ll
+++ b/test/CodeGen/PowerPC/negctr.ll
@@ -1,4 +1,5 @@
 ; RUN: llc < %s -mcpu=a2 | FileCheck %s
+; RUN: llc < %s -mcpu=a2 -disable-lsr | FileCheck -check-prefix=NOLSR %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-f128:128:128-v128:128:128-n32:64"
 target triple = "powerpc64-unknown-linux-gnu"
 
@@ -60,4 +61,23 @@ for.end:                                          ; preds = %for.body, %entry
   ret void
 }
 
+define void @main3() #0 {
+entry:
+  br i1 undef, label %for.end, label %for.body
+
+for.body:                                         ; preds = %for.body, %entry
+  %indvars.iv = phi i64 [ %indvars.iv.next, %for.body ], [ 127984, %entry ]
+  %indvars.iv.next = add i64 %indvars.iv, -16
+  %exitcond = icmp eq i64 %indvars.iv.next, -16
+  br i1 %exitcond, label %for.end, label %for.body
+
+; NOLSR: @main3
+; NOLSR: li [[REG:[0-9]+]], 8000
+; NOLSR: mtctr [[REG]]
+; NOLSR: bdnz
+
+for.end:                                          ; preds = %for.body, %entry
+  ret void
+}
+
 attributes #0 = { nounwind "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-frame-pointer-elim-non-leaf"="true" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "unsafe-fp-math"="false" "use-soft-float"="false" }