[PATCH] D20859: [X86][SSE] Replace (V)CVTTPS2DQ and VCVTTPD2DQ truncating (round to zero) f32/f64 to i32 with generic IR (clang)

[Simon Pilgrim via cfe-commits]

RKSimon created this revision.
RKSimon added reviewers: ab, mkuper, craig.topper, spatel, andreadb.
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The 'cvtt' truncation (round to zero) conversions can be safely represented as generic __builtin_convertvector (fptosi) calls instead of x86 intrinsics.

We already do this (implicitly) for the scalar equivalents.

Note: I looked at updating _mm_cvttpd_epi32 as well but this still requires a lot more backend work to correctly lower (both for debug and optimized builds).

Repository:
  rL LLVM

http://reviews.llvm.org/D20859

Files:
  include/clang/Basic/BuiltinsX86.def
  lib/Headers/avxintrin.h
  lib/Headers/emmintrin.h
  test/CodeGen/avx-builtins.c
  test/CodeGen/builtins-x86.c
  test/CodeGen/sse2-builtins.c

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