[X86] Add test cases showing failure to use RMW form of negate when only flags are used. NFC

llvm-svn: 357300

1 files changed, 136 insertions, 0 deletions

diff --git a/llvm/test/CodeGen/X86/fold-rmw-ops.ll b/llvm/test/CodeGen/X86/fold-rmw-ops.ll
index c524486d2c7..ad8b4e4977a 100644
--- a/llvm/test/CodeGen/X86/fold-rmw-ops.ll
+++ b/llvm/test/CodeGen/X86/fold-rmw-ops.ll
@@ -2430,3 +2430,139 @@ b:
   tail call void @b()
   ret void
 }
+
+define void @neg64_br() nounwind {
+; CHECK-LABEL: neg64_br:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    xorl %eax, %eax # encoding: [0x31,0xc0]
+; CHECK-NEXT:    subq {{.*}}(%rip), %rax # encoding: [0x48,0x2b,0x05,A,A,A,A]
+; CHECK-NEXT:    # fixup A - offset: 3, value: g64-4, kind: reloc_riprel_4byte_relax_rex
+; CHECK-NEXT:    movq %rax, {{.*}}(%rip) # encoding: [0x48,0x89,0x05,A,A,A,A]
+; CHECK-NEXT:    # fixup A - offset: 3, value: g64-4, kind: reloc_riprel_4byte
+; CHECK-NEXT:    js .LBB76_1 # encoding: [0x78,A]
+; CHECK-NEXT:    # fixup A - offset: 1, value: .LBB76_1-1, kind: FK_PCRel_1
+; CHECK-NEXT:  # %bb.2: # %b
+; CHECK-NEXT:    jmp b # TAILCALL
+; CHECK-NEXT:    # encoding: [0xeb,A]
+; CHECK-NEXT:    # fixup A - offset: 1, value: b-1, kind: FK_PCRel_1
+; CHECK-NEXT:  .LBB76_1: # %a
+; CHECK-NEXT:    jmp a # TAILCALL
+; CHECK-NEXT:    # encoding: [0xeb,A]
+; CHECK-NEXT:    # fixup A - offset: 1, value: a-1, kind: FK_PCRel_1
+entry:
+  %load1 = load i64, i64* @g64
+  %sub = sub i64 0, %load1
+  store i64 %sub, i64* @g64
+  %cond = icmp slt i64 %sub, 0
+  br i1 %cond, label %a, label %b
+
+a:
+  tail call void @a()
+  ret void
+
+b:
+  tail call void @b()
+  ret void
+}
+
+define void @neg32_br() nounwind {
+; CHECK-LABEL: neg32_br:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    xorl %eax, %eax # encoding: [0x31,0xc0]
+; CHECK-NEXT:    subl {{.*}}(%rip), %eax # encoding: [0x2b,0x05,A,A,A,A]
+; CHECK-NEXT:    # fixup A - offset: 2, value: g32-4, kind: reloc_riprel_4byte
+; CHECK-NEXT:    movl %eax, {{.*}}(%rip) # encoding: [0x89,0x05,A,A,A,A]
+; CHECK-NEXT:    # fixup A - offset: 2, value: g32-4, kind: reloc_riprel_4byte
+; CHECK-NEXT:    js .LBB77_1 # encoding: [0x78,A]
+; CHECK-NEXT:    # fixup A - offset: 1, value: .LBB77_1-1, kind: FK_PCRel_1
+; CHECK-NEXT:  # %bb.2: # %b
+; CHECK-NEXT:    jmp b # TAILCALL
+; CHECK-NEXT:    # encoding: [0xeb,A]
+; CHECK-NEXT:    # fixup A - offset: 1, value: b-1, kind: FK_PCRel_1
+; CHECK-NEXT:  .LBB77_1: # %a
+; CHECK-NEXT:    jmp a # TAILCALL
+; CHECK-NEXT:    # encoding: [0xeb,A]
+; CHECK-NEXT:    # fixup A - offset: 1, value: a-1, kind: FK_PCRel_1
+entry:
+  %load1 = load i32, i32* @g32
+  %sub = sub i32 0, %load1
+  store i32 %sub, i32* @g32
+  %cond = icmp slt i32 %sub, 0
+  br i1 %cond, label %a, label %b
+
+a:
+  tail call void @a()
+  ret void
+
+b:
+  tail call void @b()
+  ret void
+}
+
+define void @neg16_br() nounwind {
+; CHECK-LABEL: neg16_br:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    xorl %eax, %eax # encoding: [0x31,0xc0]
+; CHECK-NEXT:    subw {{.*}}(%rip), %ax # encoding: [0x66,0x2b,0x05,A,A,A,A]
+; CHECK-NEXT:    # fixup A - offset: 3, value: g16-4, kind: reloc_riprel_4byte
+; CHECK-NEXT:    movw %ax, {{.*}}(%rip) # encoding: [0x66,0x89,0x05,A,A,A,A]
+; CHECK-NEXT:    # fixup A - offset: 3, value: g16-4, kind: reloc_riprel_4byte
+; CHECK-NEXT:    js .LBB78_1 # encoding: [0x78,A]
+; CHECK-NEXT:    # fixup A - offset: 1, value: .LBB78_1-1, kind: FK_PCRel_1
+; CHECK-NEXT:  # %bb.2: # %b
+; CHECK-NEXT:    jmp b # TAILCALL
+; CHECK-NEXT:    # encoding: [0xeb,A]
+; CHECK-NEXT:    # fixup A - offset: 1, value: b-1, kind: FK_PCRel_1
+; CHECK-NEXT:  .LBB78_1: # %a
+; CHECK-NEXT:    jmp a # TAILCALL
+; CHECK-NEXT:    # encoding: [0xeb,A]
+; CHECK-NEXT:    # fixup A - offset: 1, value: a-1, kind: FK_PCRel_1
+entry:
+  %load1 = load i16, i16* @g16
+  %sub = sub i16 0, %load1
+  store i16 %sub, i16* @g16
+  %cond = icmp slt i16 %sub, 0
+  br i1 %cond, label %a, label %b
+
+a:
+  tail call void @a()
+  ret void
+
+b:
+  tail call void @b()
+  ret void
+}
+
+define void @neg8_br() nounwind {
+; CHECK-LABEL: neg8_br:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    xorl %eax, %eax # encoding: [0x31,0xc0]
+; CHECK-NEXT:    subb {{.*}}(%rip), %al # encoding: [0x2a,0x05,A,A,A,A]
+; CHECK-NEXT:    # fixup A - offset: 2, value: g8-4, kind: reloc_riprel_4byte
+; CHECK-NEXT:    movb %al, {{.*}}(%rip) # encoding: [0x88,0x05,A,A,A,A]
+; CHECK-NEXT:    # fixup A - offset: 2, value: g8-4, kind: reloc_riprel_4byte
+; CHECK-NEXT:    js .LBB79_1 # encoding: [0x78,A]
+; CHECK-NEXT:    # fixup A - offset: 1, value: .LBB79_1-1, kind: FK_PCRel_1
+; CHECK-NEXT:  # %bb.2: # %b
+; CHECK-NEXT:    jmp b # TAILCALL
+; CHECK-NEXT:    # encoding: [0xeb,A]
+; CHECK-NEXT:    # fixup A - offset: 1, value: b-1, kind: FK_PCRel_1
+; CHECK-NEXT:  .LBB79_1: # %a
+; CHECK-NEXT:    jmp a # TAILCALL
+; CHECK-NEXT:    # encoding: [0xeb,A]
+; CHECK-NEXT:    # fixup A - offset: 1, value: a-1, kind: FK_PCRel_1
+entry:
+  %load1 = load i8, i8* @g8
+  %sub = sub i8 0, %load1
+  store i8 %sub, i8* @g8
+  %cond = icmp slt i8 %sub, 0
+  br i1 %cond, label %a, label %b
+
+a:
+  tail call void @a()
+  ret void
+
+b:
+  tail call void @b()
+  ret void
+}