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52f5279653
For example, this is the hot loop in BZIP:
do {
m = *--p;
*p = ( ... );
} while (--n);
llvm-svn: 173219
72 lines
2.6 KiB
LLVM
72 lines
2.6 KiB
LLVM
; RUN: opt < %s -loop-vectorize -force-vector-unroll=1 -force-vector-width=4 -dce -instcombine -S -enable-if-conversion | 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-macosx10.8.0"
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;CHECK: fc
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;CHECK: load <4 x i16>
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;CHECK-NEXT: shufflevector <4 x i16>
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;CHECK: select <4 x i1>
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;CHECK: store <4 x i16>
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;CHECK: ret
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define void @fc(i16* nocapture %p, i32 %n, i32 %size) nounwind uwtable ssp {
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entry:
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br label %do.body
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do.body: ; preds = %cond.end, %entry
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%n.addr.0 = phi i32 [ %n, %entry ], [ %dec, %cond.end ]
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%p.addr.0 = phi i16* [ %p, %entry ], [ %incdec.ptr, %cond.end ]
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%incdec.ptr = getelementptr inbounds i16* %p.addr.0, i64 -1
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%0 = load i16* %incdec.ptr, align 2, !tbaa !0
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%conv = zext i16 %0 to i32
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%cmp = icmp ult i32 %conv, %size
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br i1 %cmp, label %cond.end, label %cond.true
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cond.true: ; preds = %do.body
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%sub = sub i32 %conv, %size
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%phitmp = trunc i32 %sub to i16
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br label %cond.end
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cond.end: ; preds = %do.body, %cond.true
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%cond = phi i16 [ %phitmp, %cond.true ], [ 0, %do.body ]
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store i16 %cond, i16* %incdec.ptr, align 2, !tbaa !0
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%dec = add i32 %n.addr.0, -1
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%tobool = icmp eq i32 %dec, 0
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br i1 %tobool, label %do.end, label %do.body
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do.end: ; preds = %cond.end
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ret void
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}
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;CHECK: example1
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;CHECK: load <4 x i32>
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;CHECK-NEXT: shufflevector <4 x i32>
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;CHECK: select <4 x i1>
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;CHECK: store <4 x i32>
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;CHECK: ret
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define void @example1(i32* nocapture %a, i32 %n, i32 %wsize) nounwind uwtable ssp {
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entry:
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br label %do.body
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do.body: ; preds = %do.body, %entry
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%n.addr.0 = phi i32 [ %n, %entry ], [ %dec, %do.body ]
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%p.0 = phi i32* [ %a, %entry ], [ %incdec.ptr, %do.body ]
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%incdec.ptr = getelementptr inbounds i32* %p.0, i64 -1
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%0 = load i32* %incdec.ptr, align 4, !tbaa !3
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%cmp = icmp slt i32 %0, %wsize
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%sub = sub nsw i32 %0, %wsize
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%cond = select i1 %cmp, i32 0, i32 %sub
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store i32 %cond, i32* %incdec.ptr, align 4, !tbaa !3
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%dec = add nsw i32 %n.addr.0, -1
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%tobool = icmp eq i32 %dec, 0
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br i1 %tobool, label %do.end, label %do.body
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do.end: ; preds = %do.body
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ret void
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}
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!0 = metadata !{metadata !"short", 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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!3 = metadata !{metadata !"int", metadata !1}
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