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Fix a sign-extension bug in PPCCTRLoops 

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

llvm-svn: 177361
This commit is contained in:
Hal Finkel 2013-03-18 23:58:28 +00:00
parent 0add40ed7d
commit fc9aad6436
2 changed files with 21 additions and 1 deletions
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2
llvm/lib/Target/PowerPC/PPCCTRLoops.cpp
View File

@ -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 ||

20
llvm/test/CodeGen/PowerPC/negctr.ll
View File

@ -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" }