[PATCH] Short-term workaround for hidden x86 float precision in calculateSpillWeightAndHint()

[Matt Arsenault]

On Apr 21, 2014, at 10:19 AM, Hal Finkel <hfinkel at anl.gov> wrote:

> To be honest, I don't understand why you're seeing this problem. I know this was a problem pre-SSE, but I think that once SSE became available, the cost of forcing IEEE strict math became reasonable. IEEE arithmetic (although not the transcendental functions) should be strictly deterministic across platforms, and I don't see any reason we should support building LLVM in any other mode.

Even pre-SSE, you can change the default excess precision mode for x87 to force 32/64-bit rounding. The default is different on different platforms, and I thought I saw somewhere in LLVM the wrappers around all the different wrappers for fldcw before.
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