[all-commits] [llvm/llvm-project] be8f21: [X86] Don't call LowerUINT_TO_FP_i32 for i32->f80 ...

[topperc via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: be8f217b180e134d568ff491b045d05c137b6234
      https://github.com/llvm/llvm-project/commit/be8f217b180e134d568ff491b045d05c137b6234
  Author: Craig Topper <craig.topper at gmail.com>
  Date:   2020-01-15 (Wed, 15 Jan 2020)

  Changed paths:
    M llvm/lib/Target/X86/X86ISelLowering.cpp
    M llvm/test/CodeGen/X86/scalar-int-to-fp.ll

  Log Message:
  -----------
  [X86] Don't call LowerUINT_TO_FP_i32 for i32->f80 on 32-bit targets with sse2.

We were performing an emulated i32->f64 in the SSE registers, then
storing that value to memory and doing a extload into the X87
domain.

After this patch we'll now just store the i32 to memory along
with an i32 0. Then do a 64-bit FILD to f80 completely in the X87
unit. This matches what we do without SSE.