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llvm-svn: 85041
This commit is contained in:
Chris Lattner 2009-10-25 06:17:51 +00:00
parent d8db8b6952
commit 81c06b943c
1 changed files with 0 additions and 35 deletions
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35
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
the entire aggregate itself. This leads it to miss opportunities, for example
in test/Transforms/SCCP/ipsccp-basic.ll:test5b.