59 lines
2.5 KiB
LLVM
59 lines
2.5 KiB
LLVM
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; RUN: opt < %s -loop-reduce -mtriple=x86_64-- -S | FileCheck %s -check-prefix=BOTH -check-prefix=INSN
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; RUN: opt < %s -loop-reduce -mtriple=x86_64-- -lsr-insns-cost=false -S | FileCheck %s -check-prefix=BOTH -check-prefix=REGS
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; RUN: llc < %s -O2 -mtriple=x86_64-- -lsr-insns-cost -asm-verbose=0 | FileCheck %s
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; OPT checks that LSR prefers less instructions to less registers.
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; For x86 LSR should prefer complicated address to new lsr induction
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; variables.
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; BOTH: for.body:
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; INSN: getelementptr i32, i32* %x, i64 %indvars.iv
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; INSN: getelementptr i32, i32* %y, i64 %indvars.iv
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; INSN: getelementptr i32, i32* %q, i64 %indvars.iv
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; REGS: %lsr.iv4 = phi
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; REGS: %lsr.iv2 = phi
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; REGS: %lsr.iv1 = phi
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; REGS: getelementptr i32, i32* %lsr.iv1, i64 1
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; REGS: getelementptr i32, i32* %lsr.iv2, i64 1
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; REGS: getelementptr i32, i32* %lsr.iv4, i64 1
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; LLC checks that LSR prefers less instructions to less registers.
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; LSR should prefer complicated address to additonal add instructions.
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; CHECK: LBB0_2:
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; CHECK-NEXT: movl (%r{{.+}},
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; CHECK-NEXT: addl (%r{{.+}},
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; CHECK-NEXT: movl %e{{.+}}, (%r{{.+}},
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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, i32 %n) {
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entry:
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%cmp10 = icmp sgt i32 %n, 0
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br i1 %cmp10, label %for.body.preheader, label %for.cond.cleanup
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for.body.preheader: ; preds = %entry
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%wide.trip.count = zext i32 %n to i64
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br label %for.body
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for.cond.cleanup.loopexit: ; preds = %for.body
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br label %for.cond.cleanup
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for.cond.cleanup: ; preds = %for.cond.cleanup.loopexit, %entry
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ret void
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for.body: ; preds = %for.body, %for.body.preheader
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%indvars.iv = phi i64 [ %indvars.iv.next, %for.body ], [ 0, %for.body.preheader ]
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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, %wide.trip.count
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br i1 %exitcond, label %for.cond.cleanup.loopexit, label %for.body
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}
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