在 2022/7/7 上午10:23, Xi Ruoyao 写道:
We were generating some unnecessary instructions for integer division.
These two patches improve the code generation to compile
template <class T> T div(T a, T b) { return a / b; }
into a single division instruction (along with a return instruction of
course) as we expected for T in {int32_t, uint32_t, int64_t}.
Bootstrapped and regtested on loongarch64-linux-gnu. Ok for trunk?
Xi Ruoyao (2):
loongarch: add alternatives for idiv insns to improve code generation
loongarch: avoid unnecessary sign-extend after 32-bit division
gcc/config/loongarch/loongarch-protos.h | 1 +
gcc/config/loongarch/loongarch.cc | 2 +-
gcc/config/loongarch/loongarch.md | 34 ++++++++++++++++------
gcc/testsuite/gcc.target/loongarch/div-1.c | 9 ++++++
gcc/testsuite/gcc.target/loongarch/div-2.c | 9 ++++++
gcc/testsuite/gcc.target/loongarch/div-3.c | 9 ++++++
gcc/testsuite/gcc.target/loongarch/div-4.c | 9 ++++++
7 files changed, 63 insertions(+), 10 deletions(-)
create mode 100644 gcc/testsuite/gcc.target/loongarch/div-1.c
create mode 100644 gcc/testsuite/gcc.target/loongarch/div-2.c
create mode 100644 gcc/testsuite/gcc.target/loongarch/div-3.c
create mode 100644 gcc/testsuite/gcc.target/loongarch/div-4.c
I am testing the spec and it can be done today or tomorrow.
