https://gcc.gnu.org/bugzilla/show_bug.cgi?id=123853
Andreas Schwab <[email protected]> changed: What |Removed |Added ---------------------------------------------------------------------------- Keywords| |wrong-code --- Comment #1 from Andreas Schwab <[email protected]> --- 3b9b8d6cfdf59337f4b7ce10ce92a98044b2657b is the first bad commit commit 3b9b8d6cfdf59337f4b7ce10ce92a98044b2657b Author: Surya Kumari Jangala <[email protected]> Date: Tue Jun 25 08:37:49 2024 -0500 ira: Scale save/restore costs of callee save registers with block frequency In assign_hard_reg(), when computing the costs of the hard registers, the cost of saving/restoring a callee-save hard register in prolog/epilog is taken into consideration. However, this cost is not scaled with the entry block frequency. Without scaling, the cost of saving/restoring is quite small and this can result in a callee-save register being chosen by assign_hard_reg() even though there are free caller-save registers available. Assigning a callee save register to a pseudo that is live in the entire function and across a call will cause shrink wrap to fail. 2024-06-25 Surya Kumari Jangala <[email protected]> gcc/ PR rtl-optimization/111673 * ira-color.cc (assign_hard_reg): Scale save/restore costs of callee save registers with block frequency. gcc/testsuite/ PR rtl-optimization/111673 * gcc.target/powerpc/pr111673.c: New test. gcc/ira-color.cc | 4 +++- gcc/testsuite/gcc.target/powerpc/pr111673.c | 17 +++++++++++++++++ 2 files changed, 20 insertions(+), 1 deletion(-) create mode 100644 gcc/testsuite/gcc.target/powerpc/pr111673.c
