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Fix for PR26690 take 2

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This is what was meant to be in the initial commit to fix this bug. The
parens were missing. This commit also adds a test case for the bug and
has undergone full testing on PPC and X86.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@261546 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nemanja Ivanovic 2016-02-22 18:04:00 +00:00
parent 4644890a51
commit 94db889776
2 changed files with 119 additions and 1 deletions
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2
lib/Target/PowerPC/PPCFrameLowering.cpp
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@ -653,7 +653,7 @@ PPCFrameLowering::findScratchRegister(MachineBasicBlock *MBB,
// Now that we've done our best to provide both registers, double check
// whether we were unable to provide enough.
if (BV.empty() || (BV.count() < 2 && TwoUniqueRegsRequired))
if (BV.count() < (TwoUniqueRegsRequired ? 2 : 1))
return false;
return true;

118
test/CodeGen/PowerPC/pr26690.ll Normal file
View File

@ -0,0 +1,118 @@
; RUN: llc -mcpu=pwr8 -mtriple=powerpc64le-unknown-linux-gnu < %s | FileCheck %s
%struct.anon = type { %struct.anon.0, %struct.anon.1 }
%struct.anon.0 = type { i32 }
%struct.anon.1 = type { i32 }
@i = common global i32 0, align 4
@b = common global i32* null, align 8
@c = common global i32 0, align 4
@a = common global i32 0, align 4
@h = common global i32 0, align 4
@g = common global i32 0, align 4
@j = common global i32 0, align 4
@f = common global %struct.anon zeroinitializer, align 4
@d = common global i32 0, align 4
@e = common global i32 0, align 4
; Function Attrs: norecurse nounwind
define signext i32 @fn1(i32* nocapture %p1, i32 signext %p2, i32* nocapture %p3) {
entry:
%0 = load i32, i32* @i, align 4, !tbaa !1
%cond = icmp eq i32 %0, 8
br i1 %cond, label %if.end16, label %while.cond.preheader
while.cond.preheader: ; preds = %entry
%1 = load i32*, i32** @b, align 8, !tbaa !5
%2 = load i32, i32* %1, align 4, !tbaa !1
%tobool18 = icmp eq i32 %2, 0
br i1 %tobool18, label %while.end, label %while.body.lr.ph
while.body.lr.ph: ; preds = %while.cond.preheader
%.pre = load i32, i32* @c, align 4, !tbaa !1
br label %while.body
while.body: ; preds = %while.body.backedge, %while.body.lr.ph
switch i32 %.pre, label %while.body.backedge [
i32 0, label %sw.bb1
i32 8, label %sw.bb1
i32 6, label %sw.bb1
i32 24, label %while.cond.backedge
]
while.body.backedge: ; preds = %while.body, %while.cond.backedge
br label %while.body
sw.bb1: ; preds = %while.body, %while.body, %while.body
store i32 2, i32* @a, align 4, !tbaa !1
br label %while.cond.backedge
while.cond.backedge: ; preds = %while.body, %sw.bb1
store i32 4, i32* @a, align 4, !tbaa !1
%.pre19 = load i32, i32* %1, align 4, !tbaa !1
%tobool = icmp eq i32 %.pre19, 0
br i1 %tobool, label %while.end.loopexit, label %while.body.backedge
while.end.loopexit: ; preds = %while.cond.backedge
br label %while.end
while.end: ; preds = %while.end.loopexit, %while.cond.preheader
%3 = load i32, i32* @h, align 4, !tbaa !1
%mul = mul nsw i32 %0, %3
%4 = load i32, i32* @g, align 4, !tbaa !1
%mul4 = mul nsw i32 %mul, %4
store i32 %mul4, i32* @j, align 4, !tbaa !1
%5 = load i32, i32* getelementptr inbounds (%struct.anon, %struct.anon* @f, i64 0, i32 0, i32 0), align 4, !tbaa !7
%tobool5 = icmp eq i32 %5, 0
br i1 %tobool5, label %if.end, label %if.then
if.then: ; preds = %while.end
%div = sdiv i32 %5, %mul
store i32 %div, i32* @g, align 4, !tbaa !1
br label %if.end
if.end: ; preds = %while.end, %if.then
%6 = phi i32 [ %4, %while.end ], [ %div, %if.then ]
%7 = load i32, i32* getelementptr inbounds (%struct.anon, %struct.anon* @f, i64 0, i32 1, i32 0), align 4, !tbaa !10
%tobool7 = icmp ne i32 %7, 0
%tobool8 = icmp ne i32 %mul4, 0
%or.cond = and i1 %tobool7, %tobool8
%tobool10 = icmp ne i32 %0, 0
%or.cond17 = and i1 %or.cond, %tobool10
br i1 %or.cond17, label %if.then11, label %if.end13
if.then11: ; preds = %if.end
store i32 %3, i32* @d, align 4, !tbaa !1
%8 = load i32, i32* @e, align 4, !tbaa !1
store i32 %8, i32* %p3, align 4, !tbaa !1
%.pre20 = load i32, i32* @g, align 4, !tbaa !1
br label %if.end13
if.end13: ; preds = %if.then11, %if.end
%9 = phi i32 [ %.pre20, %if.then11 ], [ %6, %if.end ]
%tobool14 = icmp eq i32 %9, 0
br i1 %tobool14, label %if.end16, label %if.then15
if.then15: ; preds = %if.end13
store i32 %p2, i32* %p1, align 4, !tbaa !1
br label %if.end16
if.end16: ; preds = %entry, %if.end13, %if.then15
ret i32 2
}
; CHECK: mfcr {{[0-9]+}}
!llvm.ident = !{!0}
!0 = !{!"clang version 3.9.0 (trunk 261520)"}
!1 = !{!2, !2, i64 0}
!2 = !{!"int", !3, i64 0}
!3 = !{!"omnipotent char", !4, i64 0}
!4 = !{!"Simple C/C++ TBAA"}
!5 = !{!6, !6, i64 0}
!6 = !{!"any pointer", !3, i64 0}
!7 = !{!8, !2, i64 0}
!8 = !{!"", !9, i64 0, !9, i64 4}
!9 = !{!"", !2, i64 0}
!10 = !{!8, !2, i64 4}