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| -rw-r--r-- | lib/Target/README.txt | 35 |
1 files changed, 0 insertions, 35 deletions
diff --git a/lib/Target/README.txt b/lib/Target/README.txt index 2740387..04392da 100644 --- a/lib/Target/README.txt +++ b/lib/Target/README.txt @@ -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. |