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authorUlrich Weigand <[email protected]>2014-08-04 18:41:00 +0200
committerMaarten Lankhorst <[email protected]>2014-09-06 15:51:58 +0200
commit0feb977bbfb0d6bb2c8d3178246acb035a739f37 (patch)
treef0804900506998cc4e19ee887098dcd67c2cdb61 /src/gallium/targets
parent1f184bc114143acbcea373184260da777b6c6be1 (diff)
gallivm: Fix Altivec pack intrinsics for little-endian
This patch fixes use of Altivec pack intrinsics on little-endian PowerPC systems. Since little-endian operation only affects the load and store instructions, the semantics of pack (and other) instructions that take two input vectors implicitly change: the pack instructions still fill a register placing values from the first operand into the "high" parts of the register, and values from the second operand into the "low" parts of the register, but since vector loads and stores perform an endian swap, the high parts end up at high memory addresses. To still achieve the desired effect, we have to swap the two inputs to the pack instruction on little-endian systems. This is done automatically by the back-end for instructions generated by LLVM, but needs to be done manually when emitting intrisincs (which still result in that instruction being emitted directly). Signed-off-by: Ulrich Weigand <[email protected]> Signed-off-by: Maarten Lankhorst <[email protected]>
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