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081f41bef8
Optimizations like LoadPRE in GVN will insert new instructions. If the insertion point is in a already processed BB, they should get a value number explicitly. If the insertion point is after current instruction, then just leave it. However, current GVN framework has no support for it. In this patch, we just bail out if a VN can't be found. Dfferential Revision: http://reviews.llvm.org/D14670 A test/Transforms/GVN/pr25440.ll M lib/Transforms/Scalar/GVN.cpp llvm-svn: 253536
109 lines
3.7 KiB
LLVM
109 lines
3.7 KiB
LLVM
;RUN: opt -gvn -S < %s | FileCheck %s
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target datalayout = "e-m:e-p:32:32-i64:64-v128:64:128-a:0:32-n8:16:32-S64"
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target triple = "thumbv7--linux-gnueabi"
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%struct.a = type { i16, i16, [1 x %union.a] }
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%union.a = type { i32 }
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@length = external global [0 x i32], align 4
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; Function Attrs: nounwind
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define fastcc void @foo(%struct.a* nocapture readonly %x) {
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;CHECK-LABEL: foo
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entry:
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br label %bb0
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bb0: ; preds = %land.lhs.true, %entry
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;CHECK: bb0:
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%x.tr = phi %struct.a* [ %x, %entry ], [ null, %land.lhs.true ]
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%code1 = getelementptr inbounds %struct.a, %struct.a* %x.tr, i32 0, i32 0
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%0 = load i16, i16* %code1, align 4
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; CHECK: load i32, i32*
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%conv = zext i16 %0 to i32
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switch i32 %conv, label %if.end.50 [
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i32 43, label %cleanup
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i32 52, label %if.then.5
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]
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if.then.5: ; preds = %bb0
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br i1 undef, label %land.lhs.true, label %if.then.26
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land.lhs.true: ; preds = %if.then.5
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br i1 undef, label %cleanup, label %bb0
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if.then.26: ; preds = %if.then.5
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%x.tr.lcssa163 = phi %struct.a* [ %x.tr, %if.then.5 ]
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br i1 undef, label %cond.end, label %cond.false
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cond.false: ; preds = %if.then.26
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; CHECK: cond.false:
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; CHECK-NOT: load
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%mode = getelementptr inbounds %struct.a, %struct.a* %x.tr.lcssa163, i32 0, i32 1
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%bf.load = load i16, i16* %mode, align 2
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%bf.shl = shl i16 %bf.load, 8
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br label %cond.end
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cond.end: ; preds = %cond.false, %if.then.26
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br i1 undef, label %if.then.44, label %cleanup
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if.then.44: ; preds = %cond.end
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unreachable
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if.end.50: ; preds = %bb0
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;%CHECK: if.end.50:
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%conv.lcssa = phi i32 [ %conv, %bb0 ]
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%arrayidx52 = getelementptr inbounds [0 x i32], [0 x i32]* @length, i32 0, i32 %conv.lcssa
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%1 = load i32, i32* %arrayidx52, align 4
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br i1 undef, label %for.body.57, label %cleanup
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for.body.57: ; preds = %if.end.50
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%i.2157 = add nsw i32 %1, -1
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unreachable
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cleanup: ; preds = %if.end.50, %cond.end, %land.lhs.true, %bb0
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ret void
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}
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@yy_c_buf_p = external unnamed_addr global i8*, align 4
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@dfg_text = external global i8*, align 4
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define void @dfg_lex() {
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;CHECK-LABEL: dfg_lex
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entry:
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br label %while.bodythread-pre-split
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while.bodythread-pre-split: ; preds = %while.end, %while.end, %entry
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br i1 undef, label %if.then.14, label %if.end.15
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if.then.14: ; preds = %while.end, %while.bodythread-pre-split
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%v1 = load i32, i32* bitcast (i8** @dfg_text to i32*), align 4
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%sub.ptr.sub = sub i32 undef, %v1
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br label %if.end.15
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if.end.15: ; preds = %if.then.14, %while.bodythread-pre-split
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%v2 = load i8*, i8** @yy_c_buf_p, align 4
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br label %while.cond.16
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while.cond.16: ; preds = %while.cond.16, %if.end.15
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br i1 undef, label %while.cond.16, label %while.end
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while.end: ; preds = %while.cond.16
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%add.ptr = getelementptr inbounds i8, i8* %v2, i32 undef
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store i8* %add.ptr, i8** @dfg_text, align 4
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%sub.ptr.rhs.cast25 = ptrtoint i8* %add.ptr to i32
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%sub.ptr.sub26 = sub i32 0, %sub.ptr.rhs.cast25
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switch i32 undef, label %sw.default [
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i32 65, label %while.bodythread-pre-split
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i32 3, label %return
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i32 57, label %while.bodythread-pre-split
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i32 60, label %if.then.14
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]
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sw.default: ; preds = %while.end
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unreachable
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return: ; preds = %while.end
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ret void
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}
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