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annotate test/CodeGen/X86/dag-optnone.ll @ 100:7d135dc70f03 LLVM 3.9

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LLVM 3.9
author Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
date Tue, 26 Jan 2016 22:53:40 +0900
parents afa8332a0e37
children 1172e4bd9c6f
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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1 ; RUN: llc < %s -mtriple=x86_64-pc-win32 -O0 -mattr=+avx | FileCheck %s
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2
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3 ; Background:
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4 ; If fast-isel bails out to normal selection, then the DAG combiner will run,
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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5 ; even at -O0. In principle this should not happen (those are optimizations,
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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6 ; and we said -O0) but as a practical matter there are some instruction
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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7 ; selection patterns that depend on the legalizations and transforms that the
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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8 ; DAG combiner does.
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9 ;
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10 ; The 'optnone' attribute implicitly sets -O0 and fast-isel for the function.
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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11 ; The DAG combiner was disabled for 'optnone' (but not -O0) by r221168, then
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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12 ; re-enabled in r233153 because of problems with instruction selection patterns
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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13 ; mentioned above. (Note: because 'optnone' is supposed to match -O0, r221168
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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14 ; really should have disabled the combiner for both.)
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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15 ;
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16 ; If instruction selection eventually becomes smart enough to run without DAG
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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17 ; combiner, then the combiner can be turned off for -O0 (not just 'optnone')
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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18 ; and this test can go away. (To be replaced by a different test that verifies
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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19 ; the DAG combiner does *not* run at -O0 or for 'optnone' functions.)
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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20 ;
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21 ; In the meantime, this test wants to make sure the combiner stays enabled for
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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22 ; 'optnone' functions, just as it is for -O0.
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23
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24
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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25 ; The test cases @foo[WithOptnone] prove that the same DAG combine happens
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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26 ; with -O0 and with 'optnone' set. To prove this, we use a Windows triple to
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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27 ; cause fast-isel to bail out (because something about the calling convention
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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28 ; is not handled in fast-isel). Then we have a repeated fadd that can be
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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29 ; combined into an fmul. We show that this happens in both the non-optnone
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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30 ; function and the optnone function.
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31
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32 define float @foo(float %x) #0 {
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33 entry:
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34 %add = fadd fast float %x, %x
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35 %add1 = fadd fast float %add, %x
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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36 ret float %add1
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37 }
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38
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39 ; CHECK-LABEL: @foo
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40 ; CHECK-NOT: add
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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41 ; CHECK: mul
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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42 ; CHECK-NEXT: ret
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43
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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44 define float @fooWithOptnone(float %x) #1 {
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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45 entry:
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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46 %add = fadd fast float %x, %x
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47 %add1 = fadd fast float %add, %x
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48 ret float %add1
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49 }
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50
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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51 ; CHECK-LABEL: @fooWithOptnone
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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52 ; CHECK-NOT: add
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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53 ; CHECK: mul
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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54 ; CHECK-NEXT: ret
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55
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56
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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57 ; The test case @bar is derived from an instruction selection failure case
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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58 ; that was solved by r233153. It depends on -mattr=+avx.
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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59 ; Really all we're trying to prove is that it doesn't crash any more.
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60
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61 @id84 = common global <16 x i32> zeroinitializer, align 64
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62
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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63 define void @bar() #1 {
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64 entry:
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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65 %id83 = alloca <16 x i8>, align 16
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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66 %0 = load <16 x i32>, <16 x i32>* @id84, align 64
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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67 %conv = trunc <16 x i32> %0 to <16 x i8>
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68 store <16 x i8> %conv, <16 x i8>* %id83, align 16
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69 ret void
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70 }
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71
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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72 attributes #0 = { "unsafe-fp-math"="true" }
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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73 attributes #1 = { noinline optnone "unsafe-fp-math"="true" }