The testsuite driver CPU feature detection logic only detects host CPU
and only makes sense when we are not testing a cross GHC.

(cherry picked from commit c4c6d714)

sheaf authored 2 years ago and Marge Bot committed 2 years ago

This patch adds eight new primops that fuse a multiplication and an
addition or subtraction:

  - `{fmadd,fmsub,fnmadd,fnmsub}{Float,Double}#`

fmadd x y z is x * y + z, computed with a single rounding step.

This patch implements code generation for these primops in the following
backends:

  - X86, AArch64 and PowerPC NCG,
  - LLVM
  - C

WASM uses the C implementation. The primops are unsupported in the
JavaScript backend.

The following constant folding rules are also provided:

  - compute a * b + c when a, b, c are all literals,
  - x * y + 0 ==> x * y,
  - ±1 * y + z ==> z ± y and x * ±1 + z ==> z ± x.

NB: the constant folding rules incorrectly handle signed zero.
This is a known limitation with GHC's floating-point constant folding
rules (#21227), which we hope to resolve in the future.

this prevents the testlib/driver to be overly noisy, and will also
kill some noise produiced by the aarch64-darwin cc (for now).

Fixing sysctl, will allow us to run the test's properly in a nix-shell
on aarch64-darwin

(cherry picked from commit 5109e87e)

Ben Gamari authored 4 years ago and Marge Bot committed 4 years ago

This reverts commit 0cbdba27.

This is a set of forward ports (cherry-picks) from 8.10

- a7d22795 [ci] Add support for building on aarch64-darwin
- 5109e87e [testlib/driver] denoise
- 307d3494 [ci] default value for CONFIGURE_ARGS
- 10a18cb4 [testsuite] mark ghci056 as fragile
- 16c13d5a [ci] Default value for MAKE_ARGS
- ab571457 [ci/build] Copy config.sub around
- 251892b9 [ci/darwin] bump nixpkgs rev
- 5a6c36ec [testsuite/darwin] fix conc059
- aae95ef0 [ci] add timing info
- 3592d110 [Aarch64] No div-by-zero; disable test.
- 57671071 [Darwin] mark stdc++ tests as broken
- 33c4d497 [testsuite] filter out superfluous dylib warnings
- 4bea83af [ci/nix-shell] Add Foundation and Security
- 63455300 [testsuite/json2] Fix failure with LLVM backends
- c3944bc8 [ci/nix-shell] [Darwin] Stop the ld warnings about libiconv.
- b821fcc7 [testsuite] static001 is not broken anymore.
- f7062e1b [testsuite/arm64] fix section_alignment
- 820b0766 [darwin] stop the DYLD_LIBRARY_PATH madness
- 07b1af03 [ci/nix-shell] uniquify NIX_LDFLAGS{_FOR_TARGET}

As well as a few additional fixups needed to make this block compile:
- Fixup all.T
- Set CROSS_TARGET, BROKEN_TESTS, XZ, RUNTEST_ARGS, default value.
- [ci] shell.nix bump happy

Previously testing code-generation for ISA extensions was nearly impossible
since we had no ability to determine whether the host supports the needed
extension. Here we fix this by introducing a simple /proc/cpuinfo-based
testsuite predicate. We really ought to