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