mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-08-01 17:29:33 +00:00
42c3f554f4
move loads back past a check that the load address is valid, see new testcase. The test that went in with 72661 has exactly this case, except that the conditional it's moving past is checking something else; I've settled for changing that test to reference a global, not a pointer. It may be possible to scan all the tests you pass and make sure none of them are checking any component of the address, but it's not trivial and I'm not trying to do that here. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@73632 91177308-0d34-0410-b5e6-96231b3b80d8
73 lines
3.0 KiB
LLVM
73 lines
3.0 KiB
LLVM
; RUN: llvm-as < %s | opt -gvn -enable-load-pre | llvm-dis | not grep 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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target triple = "i386-apple-darwin9.6"
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%struct.mbuf = type { %struct.mbuf*, %struct.mbuf*, i32, i8*, i16, i16, i32 }
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define void @m_adj(%struct.mbuf* %mp, i32 %req_len) nounwind optsize {
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entry:
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%0 = icmp eq %struct.mbuf* %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* %m.0.ph, i32 0, i32 2 ; <i32*> [#uses=1]
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store i32 0, i32* %3, align 4
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%4 = getelementptr %struct.mbuf* %m.0.ph, i32 0, i32 0 ; <%struct.mbuf**> [#uses=1]
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%5 = load %struct.mbuf** %4, align 4 ; <%struct.mbuf*> [#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 %struct.mbuf* [ %5, %bb2 ], [ %mp, %bb4.preheader ] ; <%struct.mbuf*> [#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 %struct.mbuf* %m.0.ph, null ; <i1> [#uses=1]
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%7 = getelementptr %struct.mbuf* %m.0.ph, i32 0, i32 2 ; <i32*> [#uses=1]
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%8 = getelementptr %struct.mbuf* %m.0.ph, i32 0, i32 2 ; <i32*> [#uses=1]
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%9 = getelementptr %struct.mbuf* %m.0.ph, i32 0, i32 3 ; <i8**> [#uses=1]
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%10 = getelementptr %struct.mbuf* %m.0.ph, i32 0, i32 3 ; <i8**> [#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* %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, i32* %8, align 4
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%16 = load i8** %9, align 4 ; <i8*> [#uses=1]
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%17 = getelementptr i8* %16, i32 %len.0 ; <i8*> [#uses=1]
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store i8* %17, i8** %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* %mp, i32 0, i32 5 ; <i16*> [#uses=1]
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%19 = load i16* %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* %mp, i32 0, i32 6 ; <i32*> [#uses=1]
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store i32 %23, i32* %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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