mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-08-26 23:29:22 +00:00
95f7517f1b
This is to cleanup some redundency generated by LoopUnroll pass. Such redundency may not be cleaned up by existing passes after LoopUnroll. Differential Revision: http://reviews.llvm.org/D9777 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@237395 91177308-0d34-0410-b5e6-96231b3b80d8
86 lines
3.3 KiB
LLVM
86 lines
3.3 KiB
LLVM
; PR23524
|
|
; The test is to check redundency produced by loop unroll pass
|
|
; should be cleaned up by later pass.
|
|
; RUN: opt < %s -O2 -S | FileCheck %s
|
|
|
|
; After loop unroll:
|
|
; %dec18 = add nsw i32 %dec18.in, -1
|
|
; ...
|
|
; %dec18.1 = add nsw i32 %dec18, -1
|
|
; should be merged to:
|
|
; %dec18.1 = add nsw i32 %dec18.in, -2
|
|
;
|
|
; CHECK-LABEL: @_Z3fn1v(
|
|
; CHECK: %dec18.1 = add nsw i32 %dec18.in, -2
|
|
|
|
; ModuleID = '<stdin>'
|
|
target triple = "x86_64-unknown-linux-gnu"
|
|
|
|
@b = global i32 0, align 4
|
|
@c = global i32 0, align 4
|
|
|
|
; Function Attrs: nounwind uwtable
|
|
define void @_Z3fn1v() #0 {
|
|
entry:
|
|
%tmp = load i32, i32* @b, align 4
|
|
%tobool20 = icmp eq i32 %tmp, 0
|
|
br i1 %tobool20, label %for.end6, label %for.body.lr.ph
|
|
|
|
for.body.lr.ph: ; preds = %entry
|
|
br label %for.body
|
|
|
|
for.cond1.for.cond.loopexit_crit_edge: ; preds = %for.inc
|
|
%add.ptr.lcssa = phi i16* [ %add.ptr, %for.inc ]
|
|
%incdec.ptr.lcssa = phi i8* [ %incdec.ptr, %for.inc ]
|
|
br label %for.cond.loopexit
|
|
|
|
for.cond.loopexit: ; preds = %for.body, %for.cond1.for.cond.loopexit_crit_edge
|
|
%r.1.lcssa = phi i16* [ %add.ptr.lcssa, %for.cond1.for.cond.loopexit_crit_edge ], [ %r.022, %for.body ]
|
|
%a.1.lcssa = phi i8* [ %incdec.ptr.lcssa, %for.cond1.for.cond.loopexit_crit_edge ], [ %a.021, %for.body ]
|
|
%tmp1 = load i32, i32* @b, align 4
|
|
%tobool = icmp eq i32 %tmp1, 0
|
|
br i1 %tobool, label %for.cond.for.end6_crit_edge, label %for.body
|
|
|
|
for.body: ; preds = %for.cond.loopexit, %for.body.lr.ph
|
|
%r.022 = phi i16* [ undef, %for.body.lr.ph ], [ %r.1.lcssa, %for.cond.loopexit ]
|
|
%a.021 = phi i8* [ undef, %for.body.lr.ph ], [ %a.1.lcssa, %for.cond.loopexit ]
|
|
%tmp2 = load i32, i32* @c, align 4
|
|
%tobool215 = icmp eq i32 %tmp2, 0
|
|
br i1 %tobool215, label %for.cond.loopexit, label %for.body3.lr.ph
|
|
|
|
for.body3.lr.ph: ; preds = %for.body
|
|
br label %for.body3
|
|
|
|
for.body3: ; preds = %for.inc, %for.body3.lr.ph
|
|
%dec18.in = phi i32 [ %tmp2, %for.body3.lr.ph ], [ %dec18, %for.inc ]
|
|
%r.117 = phi i16* [ %r.022, %for.body3.lr.ph ], [ %add.ptr, %for.inc ]
|
|
%a.116 = phi i8* [ %a.021, %for.body3.lr.ph ], [ %incdec.ptr, %for.inc ]
|
|
%dec18 = add nsw i32 %dec18.in, -1
|
|
%tmp3 = load i8, i8* %a.116, align 1
|
|
%cmp = icmp eq i8 %tmp3, 0
|
|
br i1 %cmp, label %if.then, label %for.inc
|
|
|
|
if.then: ; preds = %for.body3
|
|
%arrayidx = getelementptr inbounds i16, i16* %r.117, i64 1
|
|
store i16 0, i16* %arrayidx, align 2
|
|
store i16 0, i16* %r.117, align 2
|
|
%arrayidx5 = getelementptr inbounds i16, i16* %r.117, i64 2
|
|
store i16 0, i16* %arrayidx5, align 2
|
|
br label %for.inc
|
|
|
|
for.inc: ; preds = %if.then, %for.body3
|
|
%incdec.ptr = getelementptr inbounds i8, i8* %a.116, i64 1
|
|
%add.ptr = getelementptr inbounds i16, i16* %r.117, i64 3
|
|
%tobool2 = icmp eq i32 %dec18, 0
|
|
br i1 %tobool2, label %for.cond1.for.cond.loopexit_crit_edge, label %for.body3, !llvm.loop !0
|
|
|
|
for.cond.for.end6_crit_edge: ; preds = %for.cond.loopexit
|
|
br label %for.end6
|
|
|
|
for.end6: ; preds = %for.cond.for.end6_crit_edge, %entry
|
|
ret void
|
|
}
|
|
|
|
!0 = !{!0, !1}
|
|
!1 = !{!"llvm.loop.unroll.count", i32 2}
|