| ; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py |
| ; RUN: llc < %s -mtriple=x86_64-unknown-unknown -fast-isel -O1 | FileCheck %s |
| |
| ; This used to crash due to the bitcast in the entry block reusing the vreg |
| ; from its input. This resulted in known bits being calculated on the v2i64 |
| ; type. But the second basic block tried to use them with a v8i16 type. This |
| ; was fixed by emitting a reg-reg copy for the bitcast so the vreg type will |
| ; be seen the same in both basic blocks. |
| |
| ; We need the entry block to fall out of fast isel after selecting the bitcast. |
| ; The shuffle vector guarantees that. The zext gives us a useful known bits |
| ; value. We also need the second basic block to fall out of fast isel which the |
| ; intrinsic guarantees. |
| |
| define <8 x i16> @bitcast_crash(i32 %arg, <8 x i16> %x, i1 %c) { |
| ; CHECK-LABEL: bitcast_crash: |
| ; CHECK: # %bb.0: # %bb |
| ; CHECK-NEXT: movl %edi, %eax |
| ; CHECK-NEXT: movq %rax, %xmm1 |
| ; CHECK-NEXT: pshufd {{.*#+}} xmm1 = xmm1[0,1,0,1] |
| ; CHECK-NEXT: testb $1, %sil |
| ; CHECK-NEXT: je .LBB0_2 |
| ; CHECK-NEXT: # %bb.1: # %bb1 |
| ; CHECK-NEXT: psraw %xmm1, %xmm0 |
| ; CHECK-NEXT: retq |
| ; CHECK-NEXT: .LBB0_2: # %bb2 |
| ; CHECK-NEXT: movdqa %xmm1, %xmm0 |
| ; CHECK-NEXT: retq |
| bb: |
| %tmp = zext i32 %arg to i64 |
| %tmp1 = insertelement <2 x i64> undef, i64 %tmp, i32 0 |
| %tmp2 = shufflevector <2 x i64> %tmp1, <2 x i64> undef, <2 x i32> zeroinitializer |
| %tmp5 = bitcast <2 x i64> %tmp2 to <8 x i16> |
| br i1 %c, label %bb1, label %bb2 |
| |
| bb1: ; preds = %bb8, %bb6 |
| %tmp9 = call <8 x i16> @llvm.x86.sse2.psra.w(<8 x i16> %x, <8 x i16> %tmp5) |
| ret <8 x i16> %tmp9 |
| |
| bb2: |
| ret <8 x i16> %tmp5 |
| } |
| |
| declare <8 x i16> @llvm.x86.sse2.psra.w(<8 x i16>, <8 x i16>) |