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Reid Barton's avatar
rwbarton authored
Summary:
On x86_64, commit e2f6bbd3 assigned
the STG registers F1 and D1 the same hardware register (xmm1), and
the same for the registers F2 and D2, etc. When mixing calls to
functions involving Float#s and Double#s, this can cause wrong Cmm
optimizations that assume the F1 and D1 registers are independent.

Reviewers: simonpj, austin

Reviewed By: austin

Subscribers: simonpj, thomie, bgamari

Differential Revision: https://phabricator.haskell.org/D993

GHC Trac Issues: #10521

(cherry picked from commit a2f828a3)
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