lsr-insns-2.ll
2.45 KB
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; RUN: opt < %s -loop-reduce -mtriple=x86_64 -S | FileCheck %s -check-prefix=BOTH -check-prefix=INSN
; RUN: opt < %s -loop-reduce -mtriple=x86_64 -lsr-insns-cost=false -S | FileCheck %s -check-prefix=BOTH -check-prefix=REGS
; RUN: llc < %s -O2 -march=x86-64 -lsr-insns-cost -asm-verbose=0 | FileCheck %s
; OPT checks that LSR prefers less instructions to less registers.
; For x86 LSR should prefer complicated address to new lsr induction
; variables.
; BOTH: for.body:
; INSN: getelementptr i32, i32* %x, i64 %indvars.iv
; INSN: getelementptr i32, i32* %y, i64 %indvars.iv
; INSN: getelementptr i32, i32* %q, i64 %indvars.iv
; REGS: %lsr.iv4 = phi
; REGS: %lsr.iv2 = phi
; REGS: %lsr.iv1 = phi
; REGS: getelementptr i32, i32* %lsr.iv1, i64 1
; REGS: getelementptr i32, i32* %lsr.iv2, i64 1
; REGS: getelementptr i32, i32* %lsr.iv4, i64 1
; LLC checks that LSR prefers less instructions to less registers.
; LSR should prefer complicated address to additonal add instructions.
; CHECK: LBB0_2:
; CHECK-NEXT: movl (%r{{.+}},
; CHECK-NEXT: addl (%r{{.+}},
; CHECK-NEXT: movl %e{{.+}}, (%r{{.+}},
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
; Function Attrs: norecurse nounwind uwtable
define void @foo(i32* nocapture readonly %x, i32* nocapture readonly %y, i32* nocapture %q, i32 %n) {
entry:
%cmp10 = icmp sgt i32 %n, 0
br i1 %cmp10, label %for.body.preheader, label %for.cond.cleanup
for.body.preheader: ; preds = %entry
%wide.trip.count = zext i32 %n to i64
br label %for.body
for.cond.cleanup.loopexit: ; preds = %for.body
br label %for.cond.cleanup
for.cond.cleanup: ; preds = %for.cond.cleanup.loopexit, %entry
ret void
for.body: ; preds = %for.body, %for.body.preheader
%indvars.iv = phi i64 [ %indvars.iv.next, %for.body ], [ 0, %for.body.preheader ]
%arrayidx = getelementptr inbounds i32, i32* %x, i64 %indvars.iv
%tmp = load i32, i32* %arrayidx, align 4
%arrayidx2 = getelementptr inbounds i32, i32* %y, i64 %indvars.iv
%tmp1 = load i32, i32* %arrayidx2, align 4
%add = add nsw i32 %tmp1, %tmp
%arrayidx4 = getelementptr inbounds i32, i32* %q, i64 %indvars.iv
store i32 %add, i32* %arrayidx4, align 4
%indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
%exitcond = icmp eq i64 %indvars.iv.next, %wide.trip.count
br i1 %exitcond, label %for.cond.cleanup.loopexit, label %for.body
}