mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2025-10-31 08:16:47 +00:00
cac51be31f
The patch disabled unrolling in loop vectorization pass when VF==1 on x86 architecture, by setting MaxInterleaveFactor to 1. Unrolling in loop vectorization pass may introduce the cost of overflow check, memory boundary check and extra prologue/epilogue code when regular unroller will unroll the loop another time. Disable it when VF==1 remove the unnecessary cost on x86. The same can be done for other platforms after verifying interleaving/memory bound checking to be not perf critical on those platforms. Differential Revision: http://reviews.llvm.org/D9515 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@236613 91177308-0d34-0410-b5e6-96231b3b80d8
38 lines
1.2 KiB
LLVM
38 lines
1.2 KiB
LLVM
; This test makes sure that loop will not be unrolled in vectorization if VF computed
|
|
; equals to 1.
|
|
; RUN: opt < %s -loop-vectorize -S | FileCheck %s
|
|
|
|
; Make sure there are no geps being merged.
|
|
; CHECK-LABEL: @foo(
|
|
; CHECK: getelementptr
|
|
; CHECK-NOT: getelementptr
|
|
|
|
@N = common global i32 0, align 4
|
|
@a = common global [1000 x i32] zeroinitializer, align 16
|
|
|
|
define void @foo() #0 {
|
|
entry:
|
|
%0 = load i32, i32* @N, align 4
|
|
%cmp5 = icmp sgt i32 %0, 0
|
|
br i1 %cmp5, label %for.body.lr.ph, label %for.end
|
|
|
|
for.body.lr.ph: ; preds = %entry
|
|
%conv = sext i32 %0 to i64
|
|
br label %for.body
|
|
|
|
for.body: ; preds = %for.body.lr.ph, %for.body
|
|
%i.06 = phi i64 [ 0, %for.body.lr.ph ], [ %inc, %for.body ]
|
|
%mul = mul nuw nsw i64 %i.06, 7
|
|
%arrayidx = getelementptr inbounds [1000 x i32], [1000 x i32]* @a, i64 0, i64 %mul
|
|
store i32 3, i32* %arrayidx, align 4
|
|
%inc = add nuw nsw i64 %i.06, 1
|
|
%cmp = icmp slt i64 %inc, %conv
|
|
br i1 %cmp, label %for.body, label %for.end.loopexit
|
|
|
|
for.end.loopexit: ; preds = %for.body
|
|
br label %for.end
|
|
|
|
for.end: ; preds = %for.end.loopexit, %entry
|
|
ret void
|
|
}
|