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https://github.com/c64scene-ar/llvm-6502.git
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f241174421
Getelementptrs that are defined to wrap are virtually useless to optimization, and getelementptrs that are undefined on any kind of overflow are too restrictive -- it's difficult to ensure that all intermediate addresses are within bounds. I'm going to take a different approach. Remove a few optimizations that depended on this flag. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@76437 91177308-0d34-0410-b5e6-96231b3b80d8
40 lines
1.4 KiB
LLVM
40 lines
1.4 KiB
LLVM
; RUN: llvm-as < %s | opt -indvars | llvm-dis > %t
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; RUN: grep {icmp ugt i8\\\*} %t | count 1
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; RUN: grep {icmp sgt i8\\\*} %t | count 1
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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"
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%struct.CKenCodeCodec = type <{ i8 }>
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define void @foo(i8* %str1Ptr, i8* %str2Ptr, i8* %inLastBytePtr) nounwind {
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entry:
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%0 = icmp ult i8* %str2Ptr, %str1Ptr ; <i1> [#uses=1]
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%str2Ptr_addr.0 = select i1 %0, i8* %str1Ptr, i8* %str2Ptr ; <i8*> [#uses=1]
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br label %bb2
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bb2: ; preds = %bb2, %entry
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%str2Ptr_addr.1 = phi i8* [ %str2Ptr_addr.0, %entry ], [ %1, %bb2 ] ; <i8*> [#uses=1]
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%1 = getelementptr i8* %str2Ptr_addr.1, i64 1 ; <i8*> [#uses=2]
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%2 = icmp ult i8* %1, %inLastBytePtr ; <i1> [#uses=0]
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br i1 false, label %bb2, label %return
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return: ; preds = %bb2
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ret void
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}
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define void @sfoo(i8* %str1Ptr, i8* %str2Ptr, i8* %inLastBytePtr) nounwind {
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entry:
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%0 = icmp slt i8* %str2Ptr, %str1Ptr ; <i1> [#uses=1]
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%str2Ptr_addr.0 = select i1 %0, i8* %str1Ptr, i8* %str2Ptr ; <i8*> [#uses=1]
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br label %bb2
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bb2: ; preds = %bb2, %entry
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%str2Ptr_addr.1 = phi i8* [ %str2Ptr_addr.0, %entry ], [ %1, %bb2 ] ; <i8*> [#uses=1]
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%1 = getelementptr i8* %str2Ptr_addr.1, i64 1 ; <i8*> [#uses=2]
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%2 = icmp slt i8* %1, %inLastBytePtr ; <i1> [#uses=0]
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br i1 false, label %bb2, label %return
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return: ; preds = %bb2
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ret void
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}
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