forked from OSchip/llvm-project
53 lines
1.9 KiB
LLVM
53 lines
1.9 KiB
LLVM
; RUN: opt < %s -loop-reduce -mtriple=x86_64 -lsr-insns-cost -S | FileCheck %s -check-prefix=BOTH -check-prefix=INSN
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; RUN: opt < %s -loop-reduce -mtriple=x86_64 -S | FileCheck %s -check-prefix=BOTH -check-prefix=REGS
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; RUN: llc < %s -O2 -march=x86-64 -lsr-insns-cost -asm-verbose=0 | FileCheck %s
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; OPT test checks that LSR optimize compare for static counter to compare with 0.
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; BOTH: for.body:
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; INSN: icmp eq i64 %lsr.iv.next, 0
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; REGS: icmp eq i64 %indvars.iv.next, 1024
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; LLC test checks that LSR optimize compare for static counter.
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; That means that instead of creating the following:
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; movl %ecx, (%rdx,%rax,4)
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; incq %rax
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; cmpq $1024, %rax
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; LSR should optimize out cmp:
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; movl %ecx, 4096(%rdx,%rax)
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; addq $4, %rax
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; or
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; movl %ecx, 4096(%rdx,%rax,4)
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; incq %rax
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; CHECK: LBB0_1:
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; CHECK-NEXT: movl 4096(%{{.+}},[[REG:%[0-9a-z]+]]
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; CHECK-NEXT: addl 4096(%{{.+}},[[REG]]
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; CHECK-NEXT: movl %{{.+}}, 4096(%{{.+}},[[REG]]
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; CHECK-NOT: cmp
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; CHECK: jne
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target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
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; Function Attrs: norecurse nounwind uwtable
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define void @foo(i32* nocapture readonly %x, i32* nocapture readonly %y, i32* nocapture %q) {
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entry:
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br label %for.body
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for.cond.cleanup: ; preds = %for.body
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ret void
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for.body: ; preds = %for.body, %entry
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%indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ]
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%arrayidx = getelementptr inbounds i32, i32* %x, i64 %indvars.iv
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%tmp = load i32, i32* %arrayidx, align 4
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%arrayidx2 = getelementptr inbounds i32, i32* %y, i64 %indvars.iv
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%tmp1 = load i32, i32* %arrayidx2, align 4
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%add = add nsw i32 %tmp1, %tmp
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%arrayidx4 = getelementptr inbounds i32, i32* %q, i64 %indvars.iv
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store i32 %add, i32* %arrayidx4, align 4
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%indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
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%exitcond = icmp eq i64 %indvars.iv.next, 1024
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br i1 %exitcond, label %for.cond.cleanup, label %for.body
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}
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