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[X86] In X86FastEmitSSESelect, fall back to SelectionDAG if the inputs to the compare can't be found in registers.

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We were checking that the original Value * for the compare operands
were null. But that can never happen.

I believe we intended to check for 0 registers here instead.

Fixes PR44749.
This commit is contained in:
Craig Topper 2020-02-01 12:24:53 -08:00
parent 7cc26d6c02
commit eac65816dc
2 changed files with 57 additions and 1 deletions
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2
lib/Target/X86/X86FastISel.cpp
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@ -2194,7 +2194,7 @@ bool X86FastISel::X86FastEmitSSESelect(MVT RetVT, const Instruction *I) {
unsigned CmpRHSReg = getRegForValue(CmpRHS);
bool CmpRHSIsKill = hasTrivialKill(CmpRHS);
if (!LHSReg || !RHSReg || !CmpLHS || !CmpRHS)
if (!LHSReg || !RHSReg || !CmpLHSReg || !CmpRHSReg)
return false;
const TargetRegisterClass *RC = TLI.getRegClassFor(RetVT);

56
test/CodeGen/X86/pr44749.ll Normal file
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@ -0,0 +1,56 @@
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
; RUN: llc < %s -mtriple=x86_64-apple-macosx10.15.0 -O0 | FileCheck %s
define i32 @a() {
; CHECK-LABEL: a:
; CHECK: ## %bb.0: ## %entry
; CHECK-NEXT: subq $40, %rsp
; CHECK-NEXT: .cfi_def_cfa_offset 48
; CHECK-NEXT: movsd {{.*#+}} xmm0 = mem[0],zero
; CHECK-NEXT: movsd {{.*#+}} xmm1 = mem[0],zero
; CHECK-NEXT: xorl %eax, %eax
; CHECK-NEXT: ## kill: def $al killed $al killed $eax
; CHECK-NEXT: movsd %xmm0, {{[-0-9]+}}(%r{{[sb]}}p) ## 8-byte Spill
; CHECK-NEXT: movsd %xmm1, {{[-0-9]+}}(%r{{[sb]}}p) ## 8-byte Spill
; CHECK-NEXT: callq _b
; CHECK-NEXT: cvtsi2sd %eax, %xmm0
; CHECK-NEXT: movq _calloc@{{.*}}(%rip), %rcx
; CHECK-NEXT: subq $-1, %rcx
; CHECK-NEXT: movsd {{.*#+}} xmm1 = mem[0],zero
; CHECK-NEXT: xorps %xmm2, %xmm2
; CHECK-NEXT: movsd %xmm0, {{[-0-9]+}}(%r{{[sb]}}p) ## 8-byte Spill
; CHECK-NEXT: movsd %xmm2, {{[-0-9]+}}(%r{{[sb]}}p) ## 8-byte Spill
; CHECK-NEXT: movsd %xmm1, (%rsp) ## 8-byte Spill
; CHECK-NEXT: jne LBB0_2
; CHECK-NEXT: ## %bb.1: ## %entry
; CHECK-NEXT: movsd {{[-0-9]+}}(%r{{[sb]}}p), %xmm0 ## 8-byte Reload
; CHECK-NEXT: ## xmm0 = mem[0],zero
; CHECK-NEXT: movsd %xmm0, (%rsp) ## 8-byte Spill
; CHECK-NEXT: LBB0_2: ## %entry
; CHECK-NEXT: movsd (%rsp), %xmm0 ## 8-byte Reload
; CHECK-NEXT: ## xmm0 = mem[0],zero
; CHECK-NEXT: movsd {{.*#+}} xmm1 = mem[0],zero
; CHECK-NEXT: addsd %xmm1, %xmm0
; CHECK-NEXT: movsd {{[-0-9]+}}(%r{{[sb]}}p), %xmm1 ## 8-byte Reload
; CHECK-NEXT: ## xmm1 = mem[0],zero
; CHECK-NEXT: ucomisd %xmm0, %xmm1
; CHECK-NEXT: setae %al
; CHECK-NEXT: movzbl %al, %ecx
; CHECK-NEXT: movl %ecx, %edx
; CHECK-NEXT: leaq {{.*}}(%rip), %rsi
; CHECK-NEXT: movsd {{.*#+}} xmm0 = mem[0],zero
; CHECK-NEXT: cvttsd2si %xmm0, %eax
; CHECK-NEXT: addq $40, %rsp
; CHECK-NEXT: retq
entry:
%call = call i32 (...) @b()
%conv = sitofp i32 %call to double
%cmp = fcmp ole double fsub (double sitofp (i32 select (i1 icmp ne (i8* (i64, i64)* bitcast (i8* getelementptr (i8, i8* bitcast (i8* (i64, i64)* @calloc to i8*), i64 1) to i8* (i64, i64)*), i8* (i64, i64)* null), i32 1, i32 0) to double), double 1.000000e+02), %conv
%cond = select i1 %cmp, double 1.000000e+00, double 3.140000e+00
%conv2 = fptosi double %cond to i32
ret i32 %conv2
}
declare i8* @calloc(i64, i64)
declare i32 @b(...)