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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85041 91177308-0d34-0410-b5e6-96231b3b80d8
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Chris Lattner 2009-10-25 06:17:51 +00:00
parent 93798daa3e
commit a1e1446056
1 changed files with 0 additions and 35 deletions
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lib/Target/README.txt
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@ -1594,41 +1594,6 @@ int int_char(char m) {if(m>7) return 0; return m;}
//===---------------------------------------------------------------------===// //===---------------------------------------------------------------------===//
libanalysis is not aggressively folding vector bitcasts. For example, the
constant expressions generated when compiling this code:
union vec2d {
double e[2];
double v __attribute__((vector_size(16)));
};
typedef union vec2d vec2d;
static vec2d a={{1,2}}, b={{3,4}};
vec2d foo () {
return (vec2d){ .v = a.v + b.v * (vec2d){{5,5}}.v };
}
in X86-32 end up being:
define void @foo(%union.vec2d* noalias nocapture sret %agg.result) nounwind ssp {
entry:
%agg.result.0 = getelementptr %union.vec2d* %agg.result, i32 0, i32 0 ; <<2 x double>*> [#uses=1]
store <2 x double> fadd (<2 x double> bitcast (<1 x i128> <i128 85070591730234615870450834276742070272> to <2 x double>), <2 x double> fmul (<2 x double> bitcast (<1 x i128> <i128 85153668479971173112514077617450647552> to <2 x double>), <2 x double> <double 5.000000e+00, double 5.000000e+00>)), <2 x double>* %agg.result.0, align 16
ret void
}
and in X86-64 mode:
define %0 @foo() nounwind readnone ssp {
entry:
%mrv5 = insertvalue %0 undef, double extractelement (<2 x double> fadd (<2 x double> bitcast (<1 x i128> <i128 85070591730234615870450834276742070272> to <2 x double>), <2 x double> fmul (<2 x double> bitcast (<1 x i128> <i128 85153668479971173112514077617450647552> to <2 x double>), <2 x double> bitcast (<1 x i128> <i128 85174437667405312423031577302488055808> to <2 x double>))), i32 0), 0 ; <%0> [#uses=1]
%mrv6 = insertvalue %0 %mrv5, double extractelement (<2 x double> fadd (<2 x double> bitcast (<1 x i128> <i128 85070591730234615870450834276742070272> to <2 x double>), <2 x double> fmul (<2 x double> bitcast (<1 x i128> <i128 85153668479971173112514077617450647552> to <2 x double>), <2 x double> bitcast (<1 x i128> <i128 85174437667405312423031577302488055808> to <2 x double>))), i32 1), 1 ; <%0> [#uses=1]
ret %0 %mrv6
}
//===---------------------------------------------------------------------===//
IPSCCP is propagating elements of first class aggregates, but is not propagating IPSCCP is propagating elements of first class aggregates, but is not propagating
the entire aggregate itself. This leads it to miss opportunities, for example the entire aggregate itself. This leads it to miss opportunities, for example
in test/Transforms/SCCP/ipsccp-basic.ll:test5b. in test/Transforms/SCCP/ipsccp-basic.ll:test5b.