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annotate test/CodeGen/X86/force-align-stack-alloca.ll @ 77:54457678186b LLVM3.6

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LLVM 3.6
author Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
date Mon, 08 Sep 2014 22:06:00 +0900
parents 95c75e76d11b
children 60c9769439b8
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95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
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1 ; This test is attempting to detect when we request forced re-alignment of the
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
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2 ; stack to an alignment greater than would be available due to the ABI. We
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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3 ; arbitrarily force alignment up to 32-bytes for i386 hoping that this will
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4 ; exceed any ABI provisions.
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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5 ;
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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6 ; RUN: llc < %s -mcpu=generic -force-align-stack -stack-alignment=32 | FileCheck %s
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7
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8 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-f80:32:32-n8:16:32-S128"
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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9 target triple = "i386-unknown-linux-gnu"
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10
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11 define i32 @f(i8* %p) nounwind {
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12 entry:
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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13 %0 = load i8* %p
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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14 %conv = sext i8 %0 to i32
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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15 ret i32 %conv
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16 }
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17
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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18 define i64 @g(i32 %i) nounwind {
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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19 ; CHECK-LABEL: g:
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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20 ; CHECK: pushl %ebp
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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21 ; CHECK-NEXT: movl %esp, %ebp
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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22 ; CHECK-NEXT: pushl
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23 ; CHECK-NEXT: pushl
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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24 ; CHECK-NEXT: andl $-32, %esp
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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25 ; CHECK-NEXT: subl $32, %esp
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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26 ;
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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27 ; Now setup the base pointer (%esi).
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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28 ; CHECK-NEXT: movl %esp, %esi
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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29 ; CHECK-NOT: {{[^ ,]*}}, %esp
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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30 ;
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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31 ; The next adjustment of the stack is due to the alloca.
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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32 ; CHECK: movl %{{...}}, %esp
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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33 ; CHECK-NOT: {{[^ ,]*}}, %esp
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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34 ;
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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35 ; Next we set up the memset call, and then undo it.
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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36 ; CHECK: subl $32, %esp
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37 ; CHECK-NOT: {{[^ ,]*}}, %esp
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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38 ; CHECK: calll memset
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39 ; CHECK-NEXT: addl $32, %esp
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40 ; CHECK-NOT: {{[^ ,]*}}, %esp
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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41 ;
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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42 ; Next we set up the call to 'f'.
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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43 ; CHECK: subl $32, %esp
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
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44 ; CHECK-NOT: {{[^ ,]*}}, %esp
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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45 ; CHECK: calll f
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
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46 ; CHECK-NEXT: addl $32, %esp
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
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47 ; CHECK-NOT: {{[^ ,]*}}, %esp
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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48 ;
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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49 ; Restore %esp from %ebp (frame pointer) and subtract the size of
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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50 ; zone with callee-saved registers to pop them.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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51 ; This is the state prior to stack realignment and the allocation of VLAs.
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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52 ; CHECK-NOT: popl
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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53 ; CHECK: leal -8(%ebp), %esp
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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54 ; CHECK-NEXT: popl
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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55 ; CHECK-NEXT: popl
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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56 ; CHECK-NEXT: popl %ebp
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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57 ; CHECK-NEXT: ret
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58
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59 entry:
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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60 br label %if.then
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61
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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62 if.then:
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
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63 %0 = alloca i8, i32 %i
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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64 call void @llvm.memset.p0i8.i32(i8* %0, i8 0, i32 %i, i32 1, i1 false)
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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65 %call = call i32 @f(i8* %0)
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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66 %conv = sext i32 %call to i64
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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67 ret i64 %conv
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68 }
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69
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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70 declare void @llvm.memset.p0i8.i32(i8*, i8, i32, i32, i1) nounwind