derek.holloway
7502bf64a4
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73 lines
2.9 KiB
LLVM
73 lines
2.9 KiB
LLVM
; RUN: opt < %s -passes=gvn -enable-load-pre -S | FileCheck %s
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; CHECK-NOT: pre1
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; GVN load pre was hoisting the loads at %13 and %16 up to bb4.outer.
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; This is invalid as it bypasses the check for %m.0.ph==null in bb4.
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; ModuleID = 'mbuf.c'
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target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128"
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%struct.mbuf = type { ptr, ptr, i32, ptr, i16, i16, i32 }
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define void @m_adj(ptr %mp, i32 %req_len) nounwind optsize {
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entry:
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%0 = icmp eq ptr %mp, null ; <i1> [#uses=1]
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%1 = icmp slt i32 %req_len, 0 ; <i1> [#uses=1]
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%or.cond = or i1 %1, %0 ; <i1> [#uses=1]
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br i1 %or.cond, label %return, label %bb4.preheader
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bb4.preheader: ; preds = %entry
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br label %bb4.outer
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bb2: ; preds = %bb1
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%2 = sub i32 %len.0, %13 ; <i32> [#uses=1]
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%3 = getelementptr %struct.mbuf, ptr %m.0.ph, i32 0, i32 2 ; <ptr> [#uses=1]
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store i32 0, ptr %3, align 4
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%4 = getelementptr %struct.mbuf, ptr %m.0.ph, i32 0, i32 0 ; <ptr> [#uses=1]
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%5 = load ptr, ptr %4, align 4 ; <ptr> [#uses=1]
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br label %bb4.outer
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bb4.outer: ; preds = %bb4.preheader, %bb2
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%m.0.ph = phi ptr [ %5, %bb2 ], [ %mp, %bb4.preheader ] ; <ptr> [#uses=7]
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%len.0.ph = phi i32 [ %2, %bb2 ], [ %req_len, %bb4.preheader ] ; <i32> [#uses=1]
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%6 = icmp ne ptr %m.0.ph, null ; <i1> [#uses=1]
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%7 = getelementptr %struct.mbuf, ptr %m.0.ph, i32 0, i32 2 ; <ptr> [#uses=1]
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%8 = getelementptr %struct.mbuf, ptr %m.0.ph, i32 0, i32 2 ; <ptr> [#uses=1]
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%9 = getelementptr %struct.mbuf, ptr %m.0.ph, i32 0, i32 3 ; <ptr> [#uses=1]
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%10 = getelementptr %struct.mbuf, ptr %m.0.ph, i32 0, i32 3 ; <ptr> [#uses=1]
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br label %bb4
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bb4: ; preds = %bb4.outer, %bb3
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%len.0 = phi i32 [ 0, %bb3 ], [ %len.0.ph, %bb4.outer ] ; <i32> [#uses=6]
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%11 = icmp sgt i32 %len.0, 0 ; <i1> [#uses=1]
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%12 = and i1 %11, %6 ; <i1> [#uses=1]
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br i1 %12, label %bb1, label %bb7
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bb1: ; preds = %bb4
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%13 = load i32, ptr %7, align 4 ; <i32> [#uses=3]
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%14 = icmp sgt i32 %13, %len.0 ; <i1> [#uses=1]
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br i1 %14, label %bb3, label %bb2
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bb3: ; preds = %bb1
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%15 = sub i32 %13, %len.0 ; <i32> [#uses=1]
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store i32 %15, ptr %8, align 4
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%16 = load ptr, ptr %9, align 4 ; <ptr> [#uses=1]
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%17 = getelementptr i8, ptr %16, i32 %len.0 ; <ptr> [#uses=1]
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store ptr %17, ptr %10, align 4
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br label %bb4
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bb7: ; preds = %bb4
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%18 = getelementptr %struct.mbuf, ptr %mp, i32 0, i32 5 ; <ptr> [#uses=1]
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%19 = load i16, ptr %18, align 2 ; <i16> [#uses=1]
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%20 = zext i16 %19 to i32 ; <i32> [#uses=1]
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%21 = and i32 %20, 2 ; <i32> [#uses=1]
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%22 = icmp eq i32 %21, 0 ; <i1> [#uses=1]
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br i1 %22, label %return, label %bb8
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bb8: ; preds = %bb7
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%23 = sub i32 %req_len, %len.0 ; <i32> [#uses=1]
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%24 = getelementptr %struct.mbuf, ptr %mp, i32 0, i32 6 ; <ptr> [#uses=1]
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store i32 %23, ptr %24, align 4
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ret void
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return: ; preds = %bb7, %entry
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ret void
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}
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