37162adf3e
Summary: The existing implementation creates a symbolic SCEV expression every time we analyze a phi node and then has to remove it, when the analysis is finished. This is very expensive, and in most of the cases it's also unnecessary. According to the data I collected, ~60-70% of analyzed phi nodes (measured on SPEC) have the following form: PN = phi(Start, OP(Self, Constant)) Handling such cases separately significantly speeds this up. Reviewers: sanjoy, pete Subscribers: llvm-commits Differential Revision: https://reviews.llvm.org/D32663 llvm-svn: 302096
47 lines
1.9 KiB
LLVM
47 lines
1.9 KiB
LLVM
; RUN: llc < %s -mtriple x86_64-apple-darwin11 -mcpu corei7 -filetype=obj -o - | llvm-objdump -d -unwind-info -s - | FileCheck %s
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; Regression test for http://llvm.org/bugs/show_bug.cgi?id=20800.
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; ModuleID = 'asan_report.ii'
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target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-apple-macosx10.9.0"
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@.str = private unnamed_addr constant [3 x i8] c"=>\00", align 1
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@.str1 = private unnamed_addr constant [3 x i8] c" \00", align 1
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@.str2 = private unnamed_addr constant [6 x i8] c"%s%p:\00", align 1
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; CHECK: ___asan_report_error:
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; subq instruction starts at 0x0a, so the second byte of the compact encoding
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; (UNWIND_X86_64_FRAMELESS_STACK_SIZE in mach-o/compact_unwind_encoding.h)
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; must be 0x0d.
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; CHECK: {{a:.*subq.*%rsp}}
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; CHECK: Contents of __compact_unwind section
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; CHECK: ___asan_report_error
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; Because of incorrect push instruction size in X86AsmBackend.cpp the stack
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; size was also calculated incorrectly.
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; CHECK-NOT: {{compact encoding:.*0x0309f800}}
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; CHECK: {{compact encoding:.*0x030df800}}
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define void @__asan_report_error(i64 %step) #0 {
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%str.i = alloca i64, align 8
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%stack = alloca [256 x i64], align 8
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br label %print_shadow_bytes.exit.i
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print_shadow_bytes.exit.i: ; preds = %print_shadow_bytes.exit.i, %0
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%iv.i = phi i64 [ -5, %0 ], [ %iv.next.i, %print_shadow_bytes.exit.i ]
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%reg15 = icmp eq i64 %iv.i, 0
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%.str..str1.i = select i1 %reg15, [3 x i8]* @.str, [3 x i8]* @.str1
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%reg16 = getelementptr inbounds [3 x i8], [3 x i8]* %.str..str1.i, i64 0, i64 0
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%reg17 = shl i64 %iv.i, 1
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%reg19 = inttoptr i64 %reg17 to i8*
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call void (i64*, i8*, ...) @append(i64* %str.i, i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str2, i64 0, i64 0), i8* %reg16, i8* %reg19)
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%iv.next.i = add nsw i64 %iv.i, %step
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br label %print_shadow_bytes.exit.i
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}
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declare void @append(i64*, i8*, ...)
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attributes #0 = { "no-frame-pointer-elim"="false" }
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