Craig Topper e38b7e8948 [DivRemPairs] Add an initial case for hoisting to a common predecessor. ... This patch adds support for hoisting the division and maybe the remainder for control flow graphs like this. ``` PredBB | \ | Rem | / Div ``` If we have DivRem we'll hoist both to PredBB. If not we'll just hoist Div and expand Rem using the Div. This improves our codegen for something like this ``` __uint128_t udivmodti4(__uint128_t dividend, __uint128_t divisor, __uint128_t *remainder) { if (remainder != 0) *remainder = dividend % divisor; return dividend / divisor; } ``` Reviewed By: spatel, lebedev.ri Differential Revision: https://reviews.llvm.org/D87555		2021-07-11 10:03:07 -07:00
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PowerPC	…
X86	[DivRemPairs] Add an initial case for hoisting to a common predecessor.	2021-07-11 10:03:07 -07:00