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d43d00cf3a
This case returns the value in ST(0) and then has to convert it to an SSE register. This causes significant codegen ugliness in some cases. For example in the trivial fp-stack-direct-ret.ll testcase we used to generate: _bar: subl $28, %esp call L_foo$stub fstpl 16(%esp) movsd 16(%esp), %xmm0 movsd %xmm0, 8(%esp) fldl 8(%esp) addl $28, %esp ret because we move the result of foo() into an XMM register, then have to move it back for the return of bar. Instead of hacking ever-more special cases into the call result lowering code we take a much simpler approach: on x86-32, fp return is modeled as always returning into an f80 register which is then truncated to f32 or f64 as needed. Similarly for a result, we model it as an extension to f80 + return. This exposes the truncate and extensions to the dag combiner, allowing target independent code to hack on them, eliminating them in this case. This gives us this code for the example above: _bar: subl $12, %esp call L_foo$stub addl $12, %esp ret The nasty aspect of this is that these conversions are not legal, but we want the second pass of dag combiner (post-legalize) to be able to hack on them. To handle this, we lie to legalize and say they are legal, then custom expand them on entry to the isel pass (PreprocessForFPConvert). This is gross, but less gross than the code it is replacing :) This also allows us to generate better code in several other cases. For example on fp-stack-ret-conv.ll, we now generate: _test: subl $12, %esp call L_foo$stub fstps 8(%esp) movl 16(%esp), %eax cvtss2sd 8(%esp), %xmm0 movsd %xmm0, (%eax) addl $12, %esp ret where before we produced (incidentally, the old bad code is identical to what gcc produces): _test: subl $12, %esp call L_foo$stub fstpl (%esp) cvtsd2ss (%esp), %xmm0 cvtss2sd %xmm0, %xmm0 movl 16(%esp), %eax movsd %xmm0, (%eax) addl $12, %esp ret Note that we generate slightly worse code on pr1505b.ll due to a scheduling deficiency that is unrelated to this patch. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46307 91177308-0d34-0410-b5e6-96231b3b80d8
74 lines
6.1 KiB
LLVM
74 lines
6.1 KiB
LLVM
; RUN: llvm-as < %s | llc -mcpu=i486 | grep fstpl | count 4
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; RUN: llvm-as < %s | llc -mcpu=i486 | grep fstps | count 3
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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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@llvm.global_ctors = appending global [1 x { i32, void ()* }] [ { i32, void ()* } { i32 65535, void ()* @_GLOBAL__I_a } ] ; <[1 x { i32, void ()* }]*> [#uses=0]
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define internal void @_GLOBAL__I_a() section "__TEXT,__StaticInit,regular,pure_instructions" {
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entry:
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tail call void @_ZNSt8ios_base4InitC1Ev( %"struct.std::ctype_base"* @_ZSt8__ioinit )
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%tmp10.i = tail call i32 @__cxa_atexit( void (i8*)* @__tcf_0, i8* null, i8* bitcast (i8** @__dso_handle to i8*) ) ; <i32> [#uses=0]
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ret void
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}
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define internal void @__tcf_0(i8* %unnamed_arg) {
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entry:
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tail call void @_ZNSt8ios_base4InitD1Ev( %"struct.std::ctype_base"* @_ZSt8__ioinit )
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ret void
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}
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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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define i32 @main() {
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entry:
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%tmp6 = volatile load float* @a ; <float> [#uses=1]
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%tmp9 = tail call float @tanf( float %tmp6 ) ; <float> [#uses=1]
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%tmp12 = volatile load double* @b ; <double> [#uses=1]
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%tmp13 = tail call double @tan( double %tmp12 ) ; <double> [#uses=1]
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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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%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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%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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%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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