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https://github.com/c64scene-ar/llvm-6502.git
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42d80c7a5b
(LLVM optimizers cannot do this optimization by themselves) git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@159668 91177308-0d34-0410-b5e6-96231b3b80d8
53 lines
1.5 KiB
LLVM
53 lines
1.5 KiB
LLVM
; RUN: opt < %s -bounds-checking -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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@global = private unnamed_addr constant [10 x i8] c"ola\00mundo\00", align 1
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; CHECK: f1
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; no checks are possible here
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; CHECK-NOT: trap
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define void @f1(i8* nocapture %c) {
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entry:
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%0 = load i8* %c, align 1
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%tobool1 = icmp eq i8 %0, 0
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br i1 %tobool1, label %while.end, label %while.body
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while.body:
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%c.addr.02 = phi i8* [ %incdec.ptr, %while.body ], [ %c, %entry ]
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%incdec.ptr = getelementptr inbounds i8* %c.addr.02, i64 -1
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store i8 100, i8* %c.addr.02, align 1
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%1 = load i8* %incdec.ptr, align 1
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%tobool = icmp eq i8 %1, 0
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br i1 %tobool, label %while.end, label %while.body
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while.end:
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ret void
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}
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; CHECK: f2
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define void @f2() {
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while.body.i.preheader:
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%addr = getelementptr inbounds [10 x i8]* @global, i64 0, i64 9
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br label %while.body.i
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while.body.i:
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; CHECK: phi
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; CHECK-NEXT: phi
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; CHECK-NOT: phi
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%c.addr.02.i = phi i8* [ %incdec.ptr.i, %while.body.i ], [ %addr, %while.body.i.preheader ]
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%incdec.ptr.i = getelementptr inbounds i8* %c.addr.02.i, i64 -1
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; CHECK: sub i64 10, %0
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; CHECK-NEXT: icmp ult i64 10, %0
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; CHECK-NEXT: icmp ult i64 {{.*}}, 1
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; CHECK-NEXT: or i1
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; CHECK-NEXT: br {{.*}}, label %trap
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store i8 100, i8* %c.addr.02.i, align 1
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%0 = load i8* %incdec.ptr.i, align 1
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%tobool.i = icmp eq i8 %0, 0
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br i1 %tobool.i, label %fn.exit, label %while.body.i
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fn.exit:
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ret void
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}
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