forked from OSchip/llvm-project
82 lines
2.3 KiB
LLVM
82 lines
2.3 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt < %s -S -loop-unroll -unroll-threshold=1 | FileCheck %s
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; RUN: opt < %s -S -passes='require<opt-remark-emit>,loop(loop-unroll-full)' -unroll-threshold=1 | FileCheck %s
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target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
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; Body fully unrolls into a single instruction after unroll and simplify
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define i32 @test(i8 %a) {
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; CHECK-LABEL: @test(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: br label [[FOR_BODY:%.*]]
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; CHECK: for.body:
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; CHECK-NEXT: [[ZEXT_9:%.*]] = zext i8 [[A:%.*]] to i32
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; CHECK-NEXT: ret i32 [[ZEXT_9]]
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;
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entry:
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br label %for.body
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for.body:
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%phi = phi i64 [ 0, %entry ], [ %inc, %for.body ]
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%zext = zext i8 %a to i32
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%inc = add nuw nsw i64 %phi, 1
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%cmp = icmp ult i64 %inc, 10
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br i1 %cmp, label %for.body, label %for.exit
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for.exit:
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ret i32 %zext
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}
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; Generalized version of previous to show benefit of using SCEV's ability
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; to prove invariance not Loop::isLoopInvaraint.
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define i32 @test2(i8 %a) {
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; CHECK-LABEL: @test2(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: br label [[FOR_BODY:%.*]]
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; CHECK: for.body:
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; CHECK-NEXT: [[ZEXT_9:%.*]] = zext i8 [[A:%.*]] to i32
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; CHECK-NEXT: [[AND_9:%.*]] = and i32 [[ZEXT_9]], 31
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; CHECK-NEXT: [[SHL_9:%.*]] = shl i32 [[AND_9]], 15
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; CHECK-NEXT: ret i32 [[SHL_9]]
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;
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entry:
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br label %for.body
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for.body:
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%phi = phi i64 [ 0, %entry ], [ %inc, %for.body ]
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%zext = zext i8 %a to i32
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%and = and i32 %zext, 31
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%shl = shl i32 %and, 15
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%inc = add nuw nsw i64 %phi, 1
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%cmp = icmp ult i64 %inc, 10
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br i1 %cmp, label %for.body, label %for.exit
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for.exit:
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ret i32 %shl
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}
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; Show that this works for instructions which might fault as well
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define i32 @test3(i8 %a) {
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; CHECK-LABEL: @test3(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: br label [[FOR_BODY:%.*]]
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; CHECK: for.body:
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; CHECK-NEXT: [[ZEXT_9:%.*]] = zext i8 [[A:%.*]] to i32
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; CHECK-NEXT: [[DIV_9:%.*]] = udiv i32 [[ZEXT_9]], 31
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; CHECK-NEXT: ret i32 [[DIV_9]]
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;
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entry:
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br label %for.body
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for.body:
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%phi = phi i64 [ 0, %entry ], [ %inc, %for.body ]
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%zext = zext i8 %a to i32
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%div = udiv i32 %zext, 31
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%inc = add nuw nsw i64 %phi, 1
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%cmp = icmp ult i64 %inc, 10
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br i1 %cmp, label %for.body, label %for.exit
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for.exit:
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ret i32 %div
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}
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