mirror of
https://github.com/RPCSX/llvm.git
synced 2024-12-05 02:16:46 +00:00
51dcabbf7c
this the default behavior. Patch by Evgeny Stupachenko (evstupac@gmail.com). Differential Revision: http://reviews.llvm.org/D18158 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@265388 91177308-0d34-0410-b5e6-96231b3b80d8
62 lines
2.0 KiB
LLVM
62 lines
2.0 KiB
LLVM
; RUN: opt -S -unroll-runtime -loop-unroll < %s | FileCheck %s
|
|
|
|
target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128"
|
|
|
|
;; Check that we don't emit expensive instructions to compute trip
|
|
;; counts when unrolling loops.
|
|
|
|
define i32 @test(i64 %v12, i8* %array, i64* %loc) {
|
|
; CHECK-LABEL: @test(
|
|
; CHECK-NOT: udiv
|
|
entry:
|
|
%step = load i64, i64* %loc, !range !0
|
|
br label %loop
|
|
|
|
loop: ; preds = %entry, %loop
|
|
%k.015 = phi i64 [ %v15, %loop ], [ %v12, %entry ]
|
|
%v14 = getelementptr inbounds i8, i8* %array, i64 %k.015
|
|
store i8 0, i8* %v14
|
|
%v15 = add nuw nsw i64 %k.015, %step
|
|
%v16 = icmp slt i64 %v15, 8193
|
|
br i1 %v16, label %loop, label %loopexit
|
|
|
|
loopexit: ; preds = %loop
|
|
ret i32 0
|
|
}
|
|
|
|
;; Though SCEV for loop tripcount contains division,
|
|
;; it shouldn't be considered expensive, since the division already
|
|
;; exists in the code and we don't need to expand it once more.
|
|
;; Thus, it shouldn't prevent us from unrolling the loop.
|
|
|
|
define i32 @test2(i64* %loc, i64 %conv7) {
|
|
; CHECK-LABEL: @test2(
|
|
; CHECK: udiv
|
|
; CHECK: udiv
|
|
; CHECK-NOT: udiv
|
|
; CHECK-LABEL: for.body
|
|
entry:
|
|
%rem0 = load i64, i64* %loc, align 8
|
|
%ExpensiveComputation = udiv i64 %rem0, 42 ; <<< Extra computations are added to the trip-count expression
|
|
br label %bb1
|
|
bb1:
|
|
%div11 = udiv i64 %ExpensiveComputation, %conv7
|
|
%cmp.i38 = icmp ugt i64 %div11, 1
|
|
%div12 = select i1 %cmp.i38, i64 %div11, i64 1
|
|
br label %for.body
|
|
for.body:
|
|
%rem1 = phi i64 [ %rem0, %bb1 ], [ %rem2, %for.body ]
|
|
%k1 = phi i64 [ %div12, %bb1 ], [ %dec, %for.body ]
|
|
%mul1 = mul i64 %rem1, 48271
|
|
%rem2 = urem i64 %mul1, 2147483647
|
|
%dec = add i64 %k1, -1
|
|
%cmp = icmp eq i64 %dec, 0
|
|
br i1 %cmp, label %exit, label %for.body
|
|
exit:
|
|
%rem3 = phi i64 [ %rem2, %for.body ]
|
|
store i64 %rem3, i64* %loc, align 8
|
|
ret i32 0
|
|
}
|
|
|
|
!0 = !{i64 1, i64 100}
|