mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2024-10-23 04:52:54 +02:00
7961b1b87b
Add special case for copy of zero to avoid a double copy. Differential Revision: https://reviews.llvm.org/D36104 llvm-svn: 325459
48 lines
1.6 KiB
LLVM
48 lines
1.6 KiB
LLVM
; RUN: llc < %s -verify-machineinstrs -mtriple=aarch64-none-linux-gnu | FileCheck %s
|
|
|
|
; Verify there is no tiny block having only one mov wzr instruction between for.body.lr.ph and sw.epilog.loopexit
|
|
define void @unroll_by_2(i32 %trip_count, i32* %p) {
|
|
; CHECK-LABEL: unroll_by_2
|
|
; CHECK: // %for.body.lr.ph
|
|
; CHECK: mov w{{[0-9]+}}, wzr
|
|
; CHECK: b.eq
|
|
; CHECK-NOT: mov w{{[0-9]+}}, wzr
|
|
; CHECK: // %for.body.lr.ph.new
|
|
; CHECK: // %for.body
|
|
; CHECK: // %sw.epilog.loopexit
|
|
; CHECK: // %for.body.epil
|
|
; CHECK: // %exit
|
|
; CHECK-NEXT: ret
|
|
for.body.lr.ph:
|
|
%xtraiter = and i32 %trip_count, 1
|
|
%cmp = icmp eq i32 %trip_count, 1
|
|
br i1 %cmp, label %sw.epilog.loopexit, label %for.body.lr.ph.new
|
|
|
|
for.body.lr.ph.new:
|
|
%unroll_iter = sub nsw i32 %trip_count, %xtraiter
|
|
br label %for.body
|
|
|
|
for.body:
|
|
%indvars = phi i32 [ 0, %for.body.lr.ph.new ], [ %indvars.next, %for.body ]
|
|
%niter = phi i32 [ %unroll_iter, %for.body.lr.ph.new ], [ %niter.nsub, %for.body ]
|
|
%array = getelementptr inbounds i32, i32 * %p, i32 %indvars
|
|
store i32 %niter, i32* %array
|
|
%indvars.next = add i32 %indvars, 2
|
|
%niter.nsub = add i32 %niter, -2
|
|
%niter.ncmp = icmp eq i32 %niter.nsub, 0
|
|
br i1 %niter.ncmp, label %sw.epilog.loopexit, label %for.body
|
|
|
|
sw.epilog.loopexit:
|
|
%indvars.unr = phi i32 [ 0, %for.body.lr.ph ], [ %indvars.next, %for.body ]
|
|
%lcmp.mod = icmp eq i32 %xtraiter, 0
|
|
br i1 %lcmp.mod, label %exit, label %for.body.epil
|
|
|
|
for.body.epil:
|
|
%array.epil = getelementptr inbounds i32, i32* %p, i32 %indvars.unr
|
|
store i32 %indvars.unr, i32* %array.epil
|
|
br label %exit
|
|
|
|
exit:
|
|
ret void
|
|
}
|