target/i386: use TSTEQ/TSTNE in x86 frontend

[PATCH 0/4] target/i386: use TSTEQ/TSTNE in x86 frontend

Paolo Bonzini posted 4 patches 9 months ago

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git fetch https://github.com/patchew-project/qemu tags/patchew/20240228111151.287738-1-pbonzini@redhat.com

Maintainers: Paolo Bonzini <pbonzini@redhat.com>, Richard Henderson <richard.henderson@linaro.org>, Eduardo Habkost <eduardo@habkost.net>

target/i386/tcg/translate.c | 115 ++++++++++++++++--------------------
tcg/optimize.c              |  13 ++--
target/i386/tcg/emit.c.inc  |   5 +-
3 files changed, 60 insertions(+), 73 deletions(-)

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[PATCH 0/4] target/i386: use TSTEQ/TSTNE in x86 frontend

Posted by Paolo Bonzini 9 months ago

The TSTEQ/TSTNE operations can be useful to evaluate many conditionals.
They can be used to test the sign bit or equality to zero of a partial
register, as well as to check individual bits in EFLAGS.

Paolo

Based-on: <20240228110641.287205-1-pbonzini@redhat.com>

Paolo Bonzini (4):
  target/i386: use TSTEQ/TSTNE to test low bits
  target/i386: use TSTEQ/TSTNE to check flags
  target/i386: remove mask from CCPrepare
  tcg/optimize: optimize TSTNE using smask and zmask

 target/i386/tcg/translate.c | 115 ++++++++++++++++--------------------
 tcg/optimize.c              |  13 ++--
 target/i386/tcg/emit.c.inc  |   5 +-
 3 files changed, 60 insertions(+), 73 deletions(-)

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2.43.2