re PR target/78658 (powerpc64le: ICE with -mcpu=power9 -Og)

re PR target/78658 (powerpc64le: ICE with -mcpu=power9 -Og)

[gcc]
2016-12-06  Michael Meissner  <meissner@linux.vnet.ibm.com>

	PR target/78658
	* config/rs6000/rs6000.md (zero_extendqi<mode>2): Use ^ instead of
	?* constraints for the ISA 3.0 patterns, so the register allocator
	is more likely to allocate QImode/HImode to vector registers for
	conversion to floating point unless a reload is needed.
	(zero_extendhi<mode>2): Likewise.
	(float<QHI:mode><FP_ISA3:mode>2_internal): Properly deal with the
	first alternative which is converting QImode/HImode to floating
	point and the QImode/HImode value is in a vector register, and
	does not allocate the second pseudo register.  Remove zero
	extending into traditional floating point registers, since the
	instruction used only works on traditional altivec registers.
	(floatuns<QHI:mode><FP_ISA3:mode>2_internal): Likewise.

[gcc/testsuite]
2016-12-06  Michael Meissner  <meissner@linux.vnet.ibm.com>

	PR target/78658
	* gcc.target/powerpc/pr78658.c: New test.

From-SVN: r243320