| ; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py |
| ; RUN: llc -mtriple=riscv32 -mattr=+v -verify-machineinstrs < %s | FileCheck %s |
| ; RUN: llc -mtriple=riscv64 -mattr=+v -verify-machineinstrs < %s | FileCheck %s |
| |
| ; These tests check that the scalable-vector version of this series of |
| ; instructions does not get into an infinite DAGCombine loop. This was |
| ; originally exposing an infinite loop between an 'and' of two truncates being promoted |
| ; to the larger value type, then that 'truncate' being split back up into an |
| ; 'and' of two truncates. |
| ; This didn't happen in the fixed-length test because a truncate of the |
| ; constant BUILD_VECTOR is folded into the BUILD_VECTOR itself. The truncate of |
| ; a constant SPLAT_VECTOR didn't follow suit. |
| |
| define <2 x i16> @fixedlen(<2 x i32> %x) { |
| ; CHECK-LABEL: fixedlen: |
| ; CHECK: # %bb.0: |
| ; CHECK-NEXT: vsetivli zero, 2, e32, mf2, ta, ma |
| ; CHECK-NEXT: vsrl.vi v8, v8, 16 |
| ; CHECK-NEXT: lui a0, 1048568 |
| ; CHECK-NEXT: vand.vx v8, v8, a0 |
| ; CHECK-NEXT: vsetvli zero, zero, e16, mf4, ta, ma |
| ; CHECK-NEXT: vnsrl.wi v8, v8, 0 |
| ; CHECK-NEXT: ret |
| %v43 = lshr <2 x i32> %x, splat (i32 16) |
| %v44 = trunc <2 x i32> %v43 to <2 x i16> |
| %v45 = insertelement <2 x i32> poison, i32 -32768, i32 0 |
| %v46 = shufflevector <2 x i32> %v45, <2 x i32> poison, <2 x i32> zeroinitializer |
| %v47 = trunc <2 x i32> %v46 to <2 x i16> |
| %v48 = and <2 x i16> %v44, %v47 |
| ret <2 x i16> %v48 |
| } |
| |
| define <vscale x 2 x i16> @scalable(<vscale x 2 x i32> %x) { |
| ; CHECK-LABEL: scalable: |
| ; CHECK: # %bb.0: |
| ; CHECK-NEXT: vsetvli a0, zero, e16, mf2, ta, ma |
| ; CHECK-NEXT: vnsrl.wi v8, v8, 16 |
| ; CHECK-NEXT: lui a0, 1048568 |
| ; CHECK-NEXT: vand.vx v8, v8, a0 |
| ; CHECK-NEXT: ret |
| %v43 = lshr <vscale x 2 x i32> %x, splat (i32 16) |
| %v44 = trunc <vscale x 2 x i32> %v43 to <vscale x 2 x i16> |
| %v45 = insertelement <vscale x 2 x i32> poison, i32 -32768, i32 0 |
| %v46 = shufflevector <vscale x 2 x i32> %v45, <vscale x 2 x i32> poison, <vscale x 2 x i32> zeroinitializer |
| %v47 = trunc <vscale x 2 x i32> %v46 to <vscale x 2 x i16> |
| %v48 = and <vscale x 2 x i16> %v44, %v47 |
| ret <vscale x 2 x i16> %v48 |
| } |