On Mon, 2022-09-26 at 14:56 +0800, Liwei Xu via Gcc-patches wrote:
> This patch implemented the optimization in PR 54346, which Merges
>
> c = VEC_PERM_EXPR <a, b, VCST0>;
> d = VEC_PERM_EXPR <c, c, VCST1>;
> to
> d = VEC_PERM_EXPR <a, b, NEW_VCST>;
>
> Bootstrapped and regtested on x86_64-pc-linux-gnu{-m32,}
> tree-ssa/forwprop-19.c fail to pass but I'm not sure whether it
> is ok to removed it.
I'm getting:
FAIL: gcc.dg/pr54346.c scan-tree-dump dse1 "VEC_PERM_EXPR.*{ 3, 6, 0, 0 }"
FAIL: gcc.dg/pr54346.c scan-tree-dump-times dse1 "VEC_PERM_EXPR" 1
on loongarch64-linux-gnu. Not sure why.
--
Xi Ruoyao <[email protected]>
School of Aerospace Science and Technology, Xidian University
