mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-09-10 06:54:54 +00:00
For now, we just reschedule instructions that use the copied vregs and let regalloc elliminate it. I would really like to eliminate the copies on-the-fly during scheduling, but we need a complete implementation of repairIntervalsInRange() first. The general strategy is for the register coalescer to eliminate as many global copies as possible and shrink live ranges to be extended-basic-block local. The coalescer should not have to worry about resolving local copies (e.g. it shouldn't attemp to reorder instructions). The scheduler is a much better place to deal with local interference. The coalescer side of this equation needs work. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@180193 91177308-0d34-0410-b5e6-96231b3b80d8
31 lines
1.2 KiB
LLVM
31 lines
1.2 KiB
LLVM
; REQUIRES: asserts
|
|
; RUN: llc < %s -march=thumb -mcpu=swift -pre-RA-sched=source -enable-misched -verify-misched -debug-only=misched -o - 2>&1 > /dev/null | FileCheck %s
|
|
;
|
|
; Loop counter copies should be eliminated.
|
|
; There is also a MUL here, but we don't care where it is scheduled.
|
|
; CHECK: postinc
|
|
; CHECK: *** Final schedule for BB#2 ***
|
|
; CHECK: t2LDRs
|
|
; CHECK: t2ADDrr
|
|
; CHECK: t2CMPrr
|
|
; CHECK: COPY
|
|
define i32 @postinc(i32 %a, i32* nocapture %d, i32 %s) nounwind {
|
|
entry:
|
|
%cmp4 = icmp eq i32 %a, 0
|
|
br i1 %cmp4, label %for.end, label %for.body
|
|
|
|
for.body: ; preds = %entry, %for.body
|
|
%indvars.iv = phi i32 [ %indvars.iv.next, %for.body ], [ 0, %entry ]
|
|
%s.05 = phi i32 [ %mul, %for.body ], [ 0, %entry ]
|
|
%indvars.iv.next = add i32 %indvars.iv, %s
|
|
%arrayidx = getelementptr inbounds i32* %d, i32 %indvars.iv
|
|
%0 = load i32* %arrayidx, align 4
|
|
%mul = mul nsw i32 %0, %s.05
|
|
%exitcond = icmp eq i32 %indvars.iv.next, %a
|
|
br i1 %exitcond, label %for.end, label %for.body
|
|
|
|
for.end: ; preds = %for.body, %entry
|
|
%s.0.lcssa = phi i32 [ 0, %entry ], [ %mul, %for.body ]
|
|
ret i32 %s.0.lcssa
|
|
}
|