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e3e67d4a0a
This changes the SelectionDAG scheduling preference to source order. Soon, the SelectionDAG scheduler can be bypassed saving a nice chunk of compile time. Performance differences that result from this change are often a consequence of register coalescing. The register coalescer is far from perfect. Bugs can be filed for deficiencies. On x86 SandyBridge/Haswell, the source order schedule is often preserved, particularly for small blocks. Register pressure is generally improved over the SD scheduler's ILP mode. However, we are still able to handle large blocks that require latency hiding, unlike the SD scheduler's BURR mode. MI scheduler also attempts to discover the critical path in single-block loops and adjust heuristics accordingly. The MI scheduler relies on the new machine model. This is currently unimplemented for AVX, so we may not be generating the best code yet. Unit tests are updated so they don't depend on SD scheduling heuristics. llvm-svn: 192750
80 lines
5.8 KiB
LLVM
80 lines
5.8 KiB
LLVM
; RUN: llc < %s -mcpu=i486 | FileCheck %s
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; PR1505
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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"
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target triple = "i686-apple-darwin8"
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%"struct.std::basic_ios<char,std::char_traits<char> >" = type { %"struct.std::ios_base", %"struct.std::basic_ostream<char,std::char_traits<char> >"*, i8, i8, %"struct.std::basic_streambuf<char,std::char_traits<char> >"*, %"struct.std::ctype<char>"*, %"struct.std::num_get<char,std::istreambuf_iterator<char, std::char_traits<char> > >"*, %"struct.std::num_get<char,std::istreambuf_iterator<char, std::char_traits<char> > >"* }
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%"struct.std::basic_ostream<char,std::char_traits<char> >" = type { i32 (...)**, %"struct.std::basic_ios<char,std::char_traits<char> >" }
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%"struct.std::basic_streambuf<char,std::char_traits<char> >" = type { i32 (...)**, i8*, i8*, i8*, i8*, i8*, i8*, %"struct.std::locale" }
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%"struct.std::ctype<char>" = type { %"struct.std::locale::facet", i32*, i8, i32*, i32*, i32*, i8, [256 x i8], [256 x i8], i8 }
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%"struct.std::ctype_base" = type <{ i8 }>
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%"struct.std::ios_base" = type { i32 (...)**, i32, i32, i32, i32, i32, %"struct.std::ios_base::_Callback_list"*, %"struct.std::ios_base::_Words", [8 x %"struct.std::ios_base::_Words"], i32, %"struct.std::ios_base::_Words"*, %"struct.std::locale" }
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%"struct.std::ios_base::_Callback_list" = type { %"struct.std::ios_base::_Callback_list"*, void (i32, %"struct.std::ios_base"*, i32)*, i32, i32 }
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%"struct.std::ios_base::_Words" = type { i8*, i32 }
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%"struct.std::locale" = type { %"struct.std::locale::_Impl"* }
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%"struct.std::locale::_Impl" = type { i32, %"struct.std::locale::facet"**, i32, %"struct.std::locale::facet"**, i8** }
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%"struct.std::locale::facet" = type { i32 (...)**, i32 }
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%"struct.std::num_get<char,std::istreambuf_iterator<char, std::char_traits<char> > >" = type { %"struct.std::locale::facet" }
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@a = global float 0x3FD3333340000000 ; <float*> [#uses=1]
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@b = global double 6.000000e-01, align 8 ; <double*> [#uses=1]
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@_ZSt8__ioinit = internal global %"struct.std::ctype_base" zeroinitializer ; <%"struct.std::ctype_base"*> [#uses=2]
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@__dso_handle = external global i8* ; <i8**> [#uses=1]
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@_ZSt4cout = external global %"struct.std::basic_ostream<char,std::char_traits<char> >" ; <%"struct.std::basic_ostream<char,std::char_traits<char> >"*> [#uses=2]
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@.str = internal constant [12 x i8] c"tan float: \00" ; <[12 x i8]*> [#uses=1]
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@.str1 = internal constant [13 x i8] c"tan double: \00" ; <[13 x i8]*> [#uses=1]
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declare void @_ZNSt8ios_base4InitD1Ev(%"struct.std::ctype_base"*)
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declare void @_ZNSt8ios_base4InitC1Ev(%"struct.std::ctype_base"*)
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declare i32 @__cxa_atexit(void (i8*)*, i8*, i8*)
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; CHECK: main
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define i32 @main() {
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entry:
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; CHECK: flds
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%tmp6 = load volatile float* @a ; <float> [#uses=1]
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; CHECK: fstps (%esp)
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; CHECK: tanf
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%tmp9 = tail call float @tanf( float %tmp6 ) ; <float> [#uses=1]
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; Spill returned value:
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; CHECK: fstp
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; CHECK: fldl
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%tmp12 = load volatile double* @b ; <double> [#uses=1]
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; CHECK: fstpl (%esp)
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; CHECK: tan
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%tmp13 = tail call double @tan( double %tmp12 ) ; <double> [#uses=1]
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; Spill returned value:
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; CHECK: fstp
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%tmp1314 = fptrunc double %tmp13 to float ; <float> [#uses=1]
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%tmp16 = tail call %"struct.std::basic_ostream<char,std::char_traits<char> >"* @_ZStlsISt11char_traitsIcEERSt13basic_ostreamIcT_ES5_PKc( %"struct.std::basic_ostream<char,std::char_traits<char> >"* @_ZSt4cout, i8* getelementptr ([12 x i8]* @.str, i32 0, i32 0) ) ; <%"struct.std::basic_ostream<char,std::char_traits<char> >"*> [#uses=1]
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%tmp1920 = fpext float %tmp9 to double ; <double> [#uses=1]
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; reload:
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; CHECK: fld
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; CHECK: fstpl
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; CHECK: ZNSolsEd
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%tmp22 = tail call %"struct.std::basic_ostream<char,std::char_traits<char> >"* @_ZNSolsEd( %"struct.std::basic_ostream<char,std::char_traits<char> >"* %tmp16, double %tmp1920 ) ; <%"struct.std::basic_ostream<char,std::char_traits<char> >"*> [#uses=1]
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%tmp30 = tail call %"struct.std::basic_ostream<char,std::char_traits<char> >"* @_ZSt4endlIcSt11char_traitsIcEERSt13basic_ostreamIT_T0_ES6_( %"struct.std::basic_ostream<char,std::char_traits<char> >"* %tmp22 ) ; <%"struct.std::basic_ostream<char,std::char_traits<char> >"*> [#uses=0]
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; reload:
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; CHECK: ZStlsISt11char_traitsIcEERSt13basic_ostreamIcT_ES5_PKc
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%tmp34 = tail call %"struct.std::basic_ostream<char,std::char_traits<char> >"* @_ZStlsISt11char_traitsIcEERSt13basic_ostreamIcT_ES5_PKc( %"struct.std::basic_ostream<char,std::char_traits<char> >"* @_ZSt4cout, i8* getelementptr ([13 x i8]* @.str1, i32 0, i32 0) ) ; <%"struct.std::basic_ostream<char,std::char_traits<char> >"*> [#uses=1]
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%tmp3940 = fpext float %tmp1314 to double ; <double> [#uses=1]
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; CHECK: fld
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; CHECK: fstpl
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; CHECK: ZNSolsEd
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%tmp42 = tail call %"struct.std::basic_ostream<char,std::char_traits<char> >"* @_ZNSolsEd( %"struct.std::basic_ostream<char,std::char_traits<char> >"* %tmp34, double %tmp3940 ) ; <%"struct.std::basic_ostream<char,std::char_traits<char> >"*> [#uses=1]
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%tmp51 = tail call %"struct.std::basic_ostream<char,std::char_traits<char> >"* @_ZSt4endlIcSt11char_traitsIcEERSt13basic_ostreamIT_T0_ES6_( %"struct.std::basic_ostream<char,std::char_traits<char> >"* %tmp42 ) ; <%"struct.std::basic_ostream<char,std::char_traits<char> >"*> [#uses=0]
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ret i32 0
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}
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declare float @tanf(float)
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declare double @tan(double)
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declare %"struct.std::basic_ostream<char,std::char_traits<char> >"* @_ZStlsISt11char_traitsIcEERSt13basic_ostreamIcT_ES5_PKc(%"struct.std::basic_ostream<char,std::char_traits<char> >"*, i8*)
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declare %"struct.std::basic_ostream<char,std::char_traits<char> >"* @_ZNSolsEd(%"struct.std::basic_ostream<char,std::char_traits<char> >"*, double)
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declare %"struct.std::basic_ostream<char,std::char_traits<char> >"* @_ZSt4endlIcSt11char_traitsIcEERSt13basic_ostreamIT_T0_ES6_(%"struct.std::basic_ostream<char,std::char_traits<char> >"*)
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