6502/llvm-6502
1
0
Fork 0
mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2024-12-15 20:29:48 +00:00
Code Issues Projects Releases Wiki Activity
a239c2e6a7
llvm-6502/test/Transforms/InstCombine/2011-06-13-nsw-alloca.ll

64 lines
1.9 KiB
LLVM
Raw Normal View History

Avoid fusing bitcasts with dynamic allocas if the amount-to-allocate might overflow. Re-typing the alloca to a larger type (e.g. double) hoists a shift into the alloca, potentially exposing overflow in the expression. rdar://problem/9265821 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@132926 91177308-0d34-0410-b5e6-96231b3b80d8
2011-06-13 18:48:49 +00:00
; RUN: opt -S -instcombine < %s | FileCheck %s
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-n8:16:32"
target triple = "i386-apple-darwin10.0.0"
Small fix in InstCombineCasts.cpp. Restored "alloca + bitcast" reducing for case when alloca's size is calculated within the "add/sub/... nsw". Also added fix to 2011-06-13-nsw-alloca.ll test. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@156231 91177308-0d34-0410-b5e6-96231b3b80d8
2012-05-05 07:09:40 +00:00
; CHECK: define void @fu1
Avoid fusing bitcasts with dynamic allocas if the amount-to-allocate might overflow. Re-typing the alloca to a larger type (e.g. double) hoists a shift into the alloca, potentially exposing overflow in the expression. rdar://problem/9265821 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@132926 91177308-0d34-0410-b5e6-96231b3b80d8
2011-06-13 18:48:49 +00:00
define void @fu1(i32 %parm) nounwind ssp {
%1 = alloca i32, align 4
Small fix in InstCombineCasts.cpp. Restored "alloca + bitcast" reducing for case when alloca's size is calculated within the "add/sub/... nsw". Also added fix to 2011-06-13-nsw-alloca.ll test. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@156231 91177308-0d34-0410-b5e6-96231b3b80d8
2012-05-05 07:09:40 +00:00
; CHECK: alloca double*
Avoid fusing bitcasts with dynamic allocas if the amount-to-allocate might overflow. Re-typing the alloca to a larger type (e.g. double) hoists a shift into the alloca, potentially exposing overflow in the expression. rdar://problem/9265821 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@132926 91177308-0d34-0410-b5e6-96231b3b80d8
2011-06-13 18:48:49 +00:00
%ptr = alloca double*, align 4
store i32 %parm, i32* %1, align 4
store double* null, double** %ptr, align 4
%2 = load i32* %1, align 4
%3 = icmp ne i32 %2, 0
br i1 %3, label %4, label %10
; <label>:4 ; preds = %0
%5 = load i32* %1, align 4
%6 = mul nsw i32 %5, 8
; With "nsw", the alloca and its bitcast can be fused:
%7 = add nsw i32 %6, 2048
Small fix in InstCombineCasts.cpp. Restored "alloca + bitcast" reducing for case when alloca's size is calculated within the "add/sub/... nsw". Also added fix to 2011-06-13-nsw-alloca.ll test. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@156231 91177308-0d34-0410-b5e6-96231b3b80d8
2012-05-05 07:09:40 +00:00
; CHECK: alloca double
Avoid fusing bitcasts with dynamic allocas if the amount-to-allocate might overflow. Re-typing the alloca to a larger type (e.g. double) hoists a shift into the alloca, potentially exposing overflow in the expression. rdar://problem/9265821 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@132926 91177308-0d34-0410-b5e6-96231b3b80d8
2011-06-13 18:48:49 +00:00
%8 = alloca i8, i32 %7
%9 = bitcast i8* %8 to double*
Small fix in InstCombineCasts.cpp. Restored "alloca + bitcast" reducing for case when alloca's size is calculated within the "add/sub/... nsw". Also added fix to 2011-06-13-nsw-alloca.ll test. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@156231 91177308-0d34-0410-b5e6-96231b3b80d8
2012-05-05 07:09:40 +00:00
; CHECK-NEXT: store double*
Avoid fusing bitcasts with dynamic allocas if the amount-to-allocate might overflow. Re-typing the alloca to a larger type (e.g. double) hoists a shift into the alloca, potentially exposing overflow in the expression. rdar://problem/9265821 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@132926 91177308-0d34-0410-b5e6-96231b3b80d8
2011-06-13 18:48:49 +00:00
store double* %9, double** %ptr, align 4
br label %10
; <label>:10 ; preds = %4, %0
%11 = load double** %ptr, align 4
call void @bar(double* %11)
; CHECK: ret
ret void
}
declare void @bar(double*)
Small fix in InstCombineCasts.cpp. Restored "alloca + bitcast" reducing for case when alloca's size is calculated within the "add/sub/... nsw". Also added fix to 2011-06-13-nsw-alloca.ll test. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@156231 91177308-0d34-0410-b5e6-96231b3b80d8
2012-05-05 07:09:40 +00:00
; CHECK: define void @fu2
Avoid fusing bitcasts with dynamic allocas if the amount-to-allocate might overflow. Re-typing the alloca to a larger type (e.g. double) hoists a shift into the alloca, potentially exposing overflow in the expression. rdar://problem/9265821 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@132926 91177308-0d34-0410-b5e6-96231b3b80d8
2011-06-13 18:48:49 +00:00
define void @fu2(i32 %parm) nounwind ssp {
%1 = alloca i32, align 4
%ptr = alloca double*, align 4
store i32 %parm, i32* %1, align 4
store double* null, double** %ptr, align 4
%2 = load i32* %1, align 4
%3 = icmp ne i32 %2, 0
br i1 %3, label %4, label %10
; <label>:4 ; preds = %0
%5 = load i32* %1, align 4
%6 = mul nsw i32 %5, 8
; Without "nsw", the alloca and its bitcast cannot be fused:
%7 = add i32 %6, 2048
; CHECK: alloca i8
%8 = alloca i8, i32 %7
; CHECK-NEXT: bitcast i8*
%9 = bitcast i8* %8 to double*
store double* %9, double** %ptr, align 4
br label %10
; <label>:10 ; preds = %4, %0
%11 = load double** %ptr, align 4
call void @bar(double* %11)
ret void
}
Reference in New Issue Copy Permalink