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[InstCombine][SSE4a] Fix assertion failure in the insertq/insertqi combining logic.

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This fixes a similar issue to the one already fixed by r280804
(revieved in D24256). Revision 280804 fixed the problem with unsafe dyn_casts
in the extrq/extrqi combining logic. However, it turns out that even the
insertq/insertqi logic was affected by the same problem.

llvm-svn: 280807
This commit is contained in:
Andrea Di Biagio 2016-09-07 12:47:53 +00:00
parent b15baf693c
commit 143c56ed9b
2 changed files with 21 additions and 3 deletions
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6
lib/Transforms/InstCombine/InstCombineCalls.cpp
View File

@ -722,10 +722,10 @@ static Value *simplifyX86insertq(IntrinsicInst &II, Value *Op0, Value *Op1,
Constant *C0 = dyn_cast<Constant>(Op0);
Constant *C1 = dyn_cast<Constant>(Op1);
ConstantInt *CI00 =
C0 ? dyn_cast<ConstantInt>(C0->getAggregateElement((unsigned)0))
C0 ? dyn_cast_or_null<ConstantInt>(C0->getAggregateElement((unsigned)0))
: nullptr;
ConstantInt *CI10 =
C1 ? dyn_cast<ConstantInt>(C1->getAggregateElement((unsigned)0))
C1 ? dyn_cast_or_null<ConstantInt>(C1->getAggregateElement((unsigned)0))
: nullptr;
// Constant Fold - insert bottom Length bits starting at the Index'th bit.
@ -1919,7 +1919,7 @@ Instruction *InstCombiner::visitCallInst(CallInst &CI) {
// See if we're dealing with constant values.
Constant *C1 = dyn_cast<Constant>(Op1);
ConstantInt *CI11 =
C1 ? dyn_cast<ConstantInt>(C1->getAggregateElement((unsigned)1))
C1 ? dyn_cast_or_null<ConstantInt>(C1->getAggregateElement((unsigned)1))
: nullptr;
// Attempt to simplify to a constant, shuffle vector or INSERTQI call.

18
test/Transforms/InstCombine/x86-sse4a.ll
View File

@ -177,6 +177,15 @@ define <2 x i64> @test_insertq_constant_undef(<2 x i64> %x, <2 x i64> %y) {
ret <2 x i64> %1
}
define <2 x i64> @test_insertq_call_constexpr(<2 x i64> %x) {
; CHECK-LABEL: @test_insertq_call_constexpr(
; CHECK-NEXT: [[TMP1:%.*]] = tail call <2 x i64> @llvm.x86.sse4a.insertq(<2 x i64> %x, <2 x i64> bitcast (<16 x i8> trunc (<16 x i16> bitcast (<4 x i64> <i64 0, i64 undef, i64 2, i64 undef> to <16 x i16>) to <16 x i8>) to <2 x i64>))
; CHECK-NEXT: ret <2 x i64> [[TMP1]]
;
%1 = tail call <2 x i64> @llvm.x86.sse4a.insertq(<2 x i64> %x, <2 x i64> bitcast (<16 x i8> trunc (<16 x i16> bitcast (<4 x i64> <i64 0, i64 undef, i64 2, i64 undef> to <16 x i16>) to <16 x i8>) to <2 x i64>))
ret <2 x i64> %1
}
;
; INSERTQI
;
@ -213,6 +222,15 @@ define <2 x i64> @test_insertqi_constant(<2 x i64> %v, <2 x i64> %i) {
ret <2 x i64> %1
}
define <2 x i64> @test_insertqi_call_constexpr(<2 x i64> %x) {
; CHECK-LABEL: @test_insertqi_call_constexpr(
; CHECK-NEXT: [[TMP1:%.*]] = tail call <2 x i64> @llvm.x86.sse4a.insertqi(<2 x i64> %x, <2 x i64> bitcast (<16 x i8> trunc (<16 x i16> bitcast (<4 x i64> <i64 0, i64 undef, i64 2, i64 undef> to <16 x i16>) to <16 x i8>) to <2 x i64>), i8 48, i8 3)
; CHECK-NEXT: ret <2 x i64> [[TMP1]]
;
%1 = tail call <2 x i64> @llvm.x86.sse4a.insertqi(<2 x i64> %x, <2 x i64> bitcast (<16 x i8> trunc (<16 x i16> bitcast (<4 x i64> <i64 0, i64 undef, i64 2, i64 undef> to <16 x i16>) to <16 x i8>) to <2 x i64>), i8 48, i8 3)
ret <2 x i64> %1
}
; The result of this insert is the second arg, since the top 64 bits of
; the result are undefined, and we copy the bottom 64 bits from the
; second arg