| commit | a39eadcf1609db66a42fa00d55da6e1ff734e1b3 | |
| author | jacquesguan <jacquesguan@me.com> | |
| Tue, 2 Nov 2021 11:13:04 +0000 (2 11:13 +0000) | ||
| committer | Ben Shi <powerman1st@163.com> | |
| Tue, 2 Nov 2021 12:04:23 +0000 (2 12:04 +0000) | ||
| tree | 84d5572fe1f34079b4c6d151a945517e746c35a0 | treesnapshot (tar.gz zip) |
| parent | 4ec1b8eeac442a44cad329bd28d5c229c227b1f7 | commitdiff |
[DAGCombiner] Teach combineShiftToMULH to handle constant and const splat vector.
Fold (srl (mul (zext i32:$a to i64), i64:c), 32) -> (mulhu $a, $b),
if c can truncate to i32 without loss.
Reviewed By: frasercrmck, craig.topper, RKSimon
Differential Revision: https://reviews.llvm.org/D108129
Fold (srl (mul (zext i32:$a to i64), i64:c), 32) -> (mulhu $a, $b),
if c can truncate to i32 without loss.
Reviewed By: frasercrmck, craig.topper, RKSimon
Differential Revision: https://reviews.llvm.org/D108129
| llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp | diffblobblamehistory | |
| llvm/test/CodeGen/RISCV/rvv/vmulh-sdnode.ll | diffblobblamehistory | |
| llvm/test/CodeGen/RISCV/rvv/vmulhu-sdnode.ll | diffblobblamehistory |