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[PATCH, rs6000] Fix mulv8hi3 pattern for little endian


The RTL generation for mulv8hi3 is slightly different for big and little
endian modes.  In the latter case, the operands of the vector-pack
instruction must be reversed to get the proper interleaving.

Bootstrapped and tested on powerpc64{,le}-unknown-linux-gnu with no new
regressions.  This fixes 3 test case failures for the little endian
target.  Is this ok for trunk?


2013-10-22  Bill Schmidt  <>

	* config/rs6000/ (mulv8hi3): Adjust for little endian.

Index: gcc/config/rs6000/
--- gcc/config/rs6000/	(revision 203923)
+++ gcc/config/rs6000/	(working copy)
@@ -681,7 +681,10 @@
    emit_insn (gen_altivec_vmrghw (high, even, odd));
    emit_insn (gen_altivec_vmrglw (low, even, odd));
-   emit_insn (gen_altivec_vpkuwum (operands[0], high, low));
+     emit_insn (gen_altivec_vpkuwum (operands[0], high, low));
+   else
+     emit_insn (gen_altivec_vpkuwum (operands[0], low, high));

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