1; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py 2; RUN: llc < %s -mtriple=x86_64-unknown-unknown -fast-isel -O1 | FileCheck %s 3 4; This used to crash due to the bitcast in the entry block reusing the vreg 5; from its input. This resulted in known bits being calculated on the v2i64 6; type. But the second basic block tried to use them with a v8i16 type. This 7; was fixed by emitting a reg-reg copy for the bitcast so the vreg type will 8; be seen the same in both basic blocks. 9 10; We need the entry block to fall out of fast isel after selecting the bitcast. 11; The shuffle vector guarantees that. The zext gives us a useful known bits 12; value. We also need the second basic block to fall out of fast isel which the 13; intrinsic guarantees. 14 15define <8 x i16> @bitcast_crash(i32 %arg, <8 x i16> %x, i1 %c) { 16; CHECK-LABEL: bitcast_crash: 17; CHECK: # %bb.0: # %bb 18; CHECK-NEXT: movd %edi, %xmm1 19; CHECK-NEXT: pshufd {{.*#+}} xmm1 = xmm1[0,1,0,1] 20; CHECK-NEXT: testb $1, %sil 21; CHECK-NEXT: je .LBB0_2 22; CHECK-NEXT: # %bb.1: # %bb1 23; CHECK-NEXT: psraw %xmm1, %xmm0 24; CHECK-NEXT: retq 25; CHECK-NEXT: .LBB0_2: # %bb2 26; CHECK-NEXT: movdqa %xmm1, %xmm0 27; CHECK-NEXT: retq 28bb: 29 %tmp = zext i32 %arg to i64 30 %tmp1 = insertelement <2 x i64> undef, i64 %tmp, i32 0 31 %tmp2 = shufflevector <2 x i64> %tmp1, <2 x i64> undef, <2 x i32> zeroinitializer 32 %tmp5 = bitcast <2 x i64> %tmp2 to <8 x i16> 33 br i1 %c, label %bb1, label %bb2 34 35bb1: ; preds = %bb8, %bb6 36 %tmp9 = call <8 x i16> @llvm.x86.sse2.psra.w(<8 x i16> %x, <8 x i16> %tmp5) 37 ret <8 x i16> %tmp9 38 39bb2: 40 ret <8 x i16> %tmp5 41} 42 43declare <8 x i16> @llvm.x86.sse2.psra.w(<8 x i16>, <8 x i16>) 44