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https://github.com/c64scene-ar/llvm-6502.git
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f148c66ce4
For example, this is the hot loop in BZIP:
do {
m = *--p;
*p = ( ... );
} while (--n);
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@173219 91177308-0d34-0410-b5e6-96231b3b80d8
51 lines
1.7 KiB
LLVM
51 lines
1.7 KiB
LLVM
; RUN: opt < %s -loop-vectorize -force-vector-unroll=1 -force-vector-width=4 -instcombine -S | FileCheck %s
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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"
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target triple = "x86_64-apple-macosx10.9.0"
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%struct.coordinate = type { i32, i32 }
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; Make sure that we don't generate a wide load when accessing the struct.
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; struct coordinate {
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; int x;
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; int y;
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; };
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;
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;
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; int foo(struct coordinate *A, int n) {
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;
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; int sum = 0;
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; for (int i = 0; i < n; ++i)
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; sum += A[i].x;
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;
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; return sum;
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; }
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;CHECK: @foo
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;CHECK-NOT: load <4 x i32>
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;CHECK: ret
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define i32 @foo(%struct.coordinate* nocapture %A, i32 %n) nounwind uwtable readonly ssp {
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entry:
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%cmp4 = icmp sgt i32 %n, 0
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br i1 %cmp4, label %for.body, label %for.end
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for.body: ; preds = %entry, %for.body
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%indvars.iv = phi i64 [ %indvars.iv.next, %for.body ], [ 0, %entry ]
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%sum.05 = phi i32 [ %add, %for.body ], [ 0, %entry ]
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%x = getelementptr inbounds %struct.coordinate* %A, i64 %indvars.iv, i32 0
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%0 = load i32* %x, align 4, !tbaa !0
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%add = add nsw i32 %0, %sum.05
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%indvars.iv.next = add i64 %indvars.iv, 1
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%lftr.wideiv = trunc i64 %indvars.iv.next to i32
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%exitcond = icmp eq i32 %lftr.wideiv, %n
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br i1 %exitcond, label %for.end, label %for.body
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for.end: ; preds = %for.body, %entry
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%sum.0.lcssa = phi i32 [ 0, %entry ], [ %add, %for.body ]
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ret i32 %sum.0.lcssa
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}
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!0 = metadata !{metadata !"int", metadata !1}
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!1 = metadata !{metadata !"omnipotent char", metadata !2}
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!2 = metadata !{metadata !"Simple C/C++ TBAA"}
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